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2017年12月28日星期四

The best Vacuum Sintering Furnace by Luwei Furnace

Sintering is a process required for many different parts and applications, including powder metallurgy, metal injection molding (MIM) and 3D printing components of various types or beading applications including abrasives.

High Temperature Vacuum Sintering Furnace is used in Sm-Co, AlNiCo, metal mesh, cemented carbide, ceramic materials, photoelectric coating materials, graphite purification, magnet material and rare refractory metals, alloys (tungsten, Mo, W-Cu alloy) vacuum sintering process, also support atmosphere sintering. Max temperature could be achieve 2200C. This equipment was based on international excellent equipment technology, after many times improvement.



Vacuum Sintering Furnace
Brand Name: Luwei
Model: Vacuum Sintering Furnace
Max.Temperature: 2000°C
Working Temperature: 2000°C
Furnace Chamber Size: 200*200*200MM
Temperature Controller: PID and SCR
Control Accuray: ± 1°C
Heating Element: Graphite
Thermocouple: Tungsten-rhenium
Chamber Material: High purity Ceramic fiber

The control system of Vacuum Sintering Furnace was controlled by PLC, temperature was controlled by intelligent temp controller, accurate control, high automation. User can choose auto or manual undisturbed switching to operate it, this furnace has abnormal condition alarming function, easy to operate. Environmental protection performance has been improved, maintenance cost saving, energy cost saving.



2017年12月27日星期三

The best Vacuum Annealing Furnace 1800°C by Luwei Furnace.

Vacuum Annealing Furnace that are widely used in various manufacturing units. Vacuum Annealing Furnace are fabricated using premium quality steel, refractory bricks and other heat supporting elements sourced from reliable vendors of market.

Vacuum Annealing Furnace is applied for annealing and aging treatment of a variety of alloy materials, devices (tungsten, molybdenum, niobium, copper alloy, etc.), magnetic materials, electrical steel, magnetic alloy, stainless steel, heat-resistant alloys, copper and its alloys, hydrogen storage alloy, active and hard molten metal.

Vacuum Annealing Furnace 1800°C
Brand Name: Luwei
Model: Vacuum Annealing Furnace 1800°C
Max.Temperature: 1800°C
Working Temperature: 1750°C
Furnace Chamber Size: 200*200*200MM
Temperature Controller: PID and SCR
Control Accuray: ± 1°C
Heating Element: MoSi2 heaters
Thermocouple: B type
Chamber Material: High purity Ceramic fiber



Vaccum Annealing furnace 1800°C can be used for numerous purposes because they apply vacuum as well as inert atmospheres. This main application is debinding and subsequent sintering of ceramics or powder metallurgical parts.



2017年12月24日星期日

Glass industrial waste refractory recycling technology

The European glass industry uses more than 100,000 tons a year for masonry kilns, which have a useful life of 5 to 8 years. The demolition of these kilns will generate thousands of tons of abandoned refractory materials, most of which will be sent to CETs or proprietary dumps.



To help users reduce the amount of waste refractory materials sent to landfills, the company is working with glass companies and kiln dismantling companies to establish standards for waste acceptance and to develop new products made from recycled materials.

At present, 30% to 35% of the silica bricks removed after the end of kiln service can be reused to make two other types of silica bricks, including siliceous wedges and light insulation Silica brick. The first European facility to comprehensively recycle spent refractory refractories specialized in the disposal of waste refractories from the glass industry, steel industrial furnaces, incinerators and chemical industries with a recovery of 90%.

Glass company will melt the wall of the kiln pool to cut the whole, re-use the effective part of the pool wall has been successful, and the ZAS brick surface with the glass removed after the use of quenching the brick crack, crushing, grinding, After screening different size fractions of aggregate and fine powder, used to produce cheap high-performance castable and iron ditch material.



2017年12月17日星期日

Refractory materials used in optical glass manufacturing

In recent years, due to the development of the optical glass industry, the optical glass of the new variety is continuously increasing, and the refractories of the optical glass are also developed correspondingly. In addition to the earliest use of clay, kaolin, bauxite and other natural raw materials to create refractory material. There are pure oxide refractory products. Such as fused silica products, fused corundum products and sintered mullite and other refractory materials. For some new varieties of optical glass melting also used tin dioxide ceramics, platinum, platinum alloys, carbon materials as smelting optical glass high temperature container, the development of new varieties of optical glass and increase the amount of optical glass have played a A certain role in promoting.



In the optical glass melting process, in order to use the crucible method and pool furnace melting method is more common. Crucible type more. Pool melting method with the main furnace using a variety of special shaped or special cast refractories. Although such materials have a complex manufacturing process but a wide variety and high resistance to glass erosion and high temperature mechanical strength, these materials provide the advantages of selective use for melting various glass varieties. Refractories include:

1. Melting optical glass crucibles and mixers

Aluminosilicate materials: clay kaolin crucible and stirrer, high aluminum lining material, SiOAI203 ~ SiO2: system of synthetic materials.

Quartz material: transparent and opaque fused quartz, quartz ceramic crucible. Corundum material: recrystallization sintering crucible, titanium corundum crucible and mixer.

Tin dioxide material: tin dioxide crucible carbon material: pyrolytic carbon crucible, glassy carbon crucible.

2. Optical glass pool furnace material

Fused quartz brick. Casting refractory materials, which include mullite, Cuomalaite, corundum oblique zircon, mouth corundum, Lu Hong, jade corundum and other fused brick.

In the aluminosilicate refractories, as a relatively old clay-kaolin refractories, due to a certain degree of high temperature, corrosion resistance, and the manufacturing process is simple, the advantages of low prices. So in the optical glass industry still occupies a very important position. Therefore, the research on the raw material properties, chemical mineral composition and manufacturing process of such refractories remains a focus of attention.



http://www.sxrefractory.com/news-23.php

2017年12月10日星期日

The current trend of glass furnace refractory applications

There are three main drivers of changes and developments in refractory materials. The first is the glass manufacturer's need to improve the quality of the glass, at least for the most part. The second is the economic requirements of glass furnaces to make kilns run longer, and the third is the impact and impact of pure oxygen combustion systems. These three requirements often determine the use of improved refractory materials when repairing a kiln. These impetuses have also prompted glass manufacturers to choose improved refractory products for furnace maintenance and to adopt new technologies for extensive overhaul in their operating cycles.



Melt-cast alumina bricks have established their use in the top of the melting tank, primarily in pure oxygen fired furnaces melting high-quality glass. Before the advent of pure oxygen combustion technology, only β ˉ alumina bricks were used to melt the superstructure of the cell and alumina-free bricks without melt-casting were applied to the top of the melting cell. Today, both molten cast products of β-alumina and α-β-alumina are used in the production of some or all of the roofs of pure oxygen combustion furnaces for color television sets (screens and cones), float glass and borosilicate glass on. Melt-cast AZS bricks can typically be used at 1600 ° C or 1650 ° C (depending on the glazing), while furnace tops made of fused alumina brick can be successfully run at 1700 ° C. This creates better conditions and greater flexibility for glass manufacturers in the production of refractory glass.

For many years, melt-cast AZS furnace roofs have successfully undergone the test of cooling and reheating to enable them to use multiple operating cycles. There is now a bit of experience in successfully implementing the top cooling and reheating of fused-alumina roofs, which represent an economically viable life when they use two or more cycles of operation. The results of the observation of the fused alumina roof in service (thermal observation and shutdown observation) show that these materials are both chemically and mechanically stable. This is the first observational study of such masonry because there was neither a reference to fused alumina at the time nor the empirical basis for its application to the roof.

2017年12月3日星期日

Reflections on the Development of Glass Industry Refractories

In recent ten years, China's glass industry has made considerable progress with the refractory materials, embodied in the large-scale float glass furnace kiln age, from 3 to 4 years to 5 to 8 years, and all materials to achieve localization, greatly Narrow the gap with the advanced level of foreign countries for the glass industry with the future development of refractory materials, and laid a solid foundation.



     In recent years, China has built more than 30 cast refractory materials enterprises, these enterprises in recent years despite the majority of varying degrees of progress, but most of the smaller scale of production, technology is weak, backward technology and equipment, product quality is difficult to guarantee. The company must have its own controllable production scale and supporting system of fused cast refractory, basic refractory, silica brick, zirconium, zirconium corundum, sillimanite, mullite refractory and new amorphous refractory material. Can provide the entire kiln refractory quality supporting materials to meet the entire glass industry, including glass fiber industry, the needs of refractory materials.

Glass furnace design, refractory production, melting furnace operation, maintenance, use and production of refractory materials and the use of scientific research between the four closely integrated, is to extend the melting furnace kiln, as soon as possible to reach the international advanced level of the important conditions one.

To extend the melting furnace kiln age must have two conditions: First, the integration of industry and trade branch of Refractories Company, to provide the furnace required for a variety of high quality refractory supporting materials; the second is to design, production, use and research Tight combination, to play their own advantages, so that the configuration of the whole furnace refractory more reasonable, superb design, meticulous operation, maintenance and management of high-quality refractory materials and supporting the supply must be closely integrated.

2017年11月30日星期四

Glass furnace refractory applications trends

For many years, melt-cast AZS furnace roofs have successfully undergone the test of cooling and reheating to enable them to use multiple operating cycles. There is now a bit of experience in successfully implementing the top cooling and reheating of fused-alumina roofs, which represent an economically viable life when they use two or more cycles of operation. The results of the observation of the fused alumina roof in service (thermal observation and shutdown observation) show that these materials are both chemically and mechanically stable. This is the first observational study of such masonry because there was neither a reference to fused alumina at the time nor the empirical basis for its application to the roof.



High-chromium refractory products in the past mainly used to enhance the glass furnace, and a small amount used in insulation glass pool furnace. High chrome bricks are increasingly being used in some soda lime glass furnaces. Its main use has not only been limited to all or part of the flow hole, but also to the end wall and, to a limited extent, the corner brick for the feed opening The high-chilled brick masonry cavity provides the potential for increased kiln life Because this material is at least twice as corrosive to most glasses as molten AZS bricks.

It has been several years since low-glass phase fused AZS refractories have been successfully used in molten pool superstructures on a limited basis. Pure oxygen combustion technology has led to its wider use in the superstructure of molten pools for two reasons: first, the low glass phase content leads to a low bleed out of the glass phase, which is higher than that of the traditional molten AZS brick Structure is more "dry." Second, the low glass phase content makes it more creep-resistant so that the normal operating temperature can be raised from 1600 ° C to 1650 ° C. This is more useful for the superstructure of the feed zone of a pure oxygen fired furnace where the molten AZS brick not only has the resistance to dust particles from the combustion air flow but also can withstand higher temperatures 1650 ℃. Molten pool wall tiles have recently been developed to improve the top (liquid line) anti-erosion properties of new varieties and has been in the field test. This pool wall brick utilizes a unique approach that controls the crystal structure of the liquid line section so that the brick has a much stronger erosion resistance at the liquid line than the standard fused AZS brick.

High zirconium fused wares (HZFC or fused zirconia) have been widely accepted as refractories in contact with glass for use in specific locations in certain high quality glass furnaces. The reasons for using the refractory of this kind of component vary from one glass type to another. Color TV picture tube screen glass is a serious erosion of HZFC but it is also used as a base and pool wall tile at the end of a melt pool flow hole because it significantly reduces glass defects such as knuckles, bubbles and stones . The corrosion resistance of fused zirconia refractories is not superior to that of molten AZS, but usually it suffices to maintain an entire kiln cycle. In this way, the use of HZFC in color picture tube screen glass cell furnaces can greatly improve the quality of the glass without reducing the life of the kiln.

2017年11月26日星期日

The adhesion of refractories materials

Thermal kilns and equipment require many specific shapes of refractory brick masonry. This requires a material that has some adhesion at both ambient and elevated temperatures. Usually we use refractory mud to achieve our goals. Silica, clay, high aluminum, magnesium refractory mud, at room temperature, through the intermolecular force, to achieve the bonding between refractory products. During high temperature use, ceramic bonding is generally achieved due to the sintering effect. In order to achieve ceramic bonding at lower temperatures, it is often necessary to add some sintering promoter in the slurry to sinter it in advance.



Recently, more and more composite adhesives are used. These include dextrin, silica sol, water glass, brine, refractory cement, leeches, resins, etc. at ambient room temperature, as well as chemical or other forms of bonding at moderate or elevated temperatures , To improve the strength of the material. In addition to most of the above-mentioned refractory materials have this feature, there are phosphoric acid, a variety of phosphate, polyphosphate, metaphosphate, sulfate, all kinds of ultrafine powder

In addition, organic binders are also one of the most popular refractory binders currently available and include tar, resins, modified bitumens, and the like. These binders have good bond strength at room temperature and form a carbon bond network after high temperature.

Because of its complementarity to various properties, organic binders are rapidly expanding and deepening their research because of their carbon residue is conducive to the high temperature performance of refractory materials.

2017年11月23日星期四

What requirements should refractories meet?

Refractory materials used in a variety of high temperature equipment, which is subject to physical and chemical erosion and mechanical damage under high temperature conditions, the performance of refractory materials should meet the following requirements:

1, high refractoriness Modern metallurgy furnace and other industrial furnace heating temperature are generally between 1000 ~ 1800 ℃. Refractory materials should have a low melting temperature at high temperatures.



2, high temperature structural strength should be large. Refractory should not only have a higher melting temperature, but also should have under the load of the furnace masonry or other mechanical vibration, without softening deformation and collapse.

3, thermal stability is better. Metallurgical furnaces and other industrial kilns in the operation process due to sudden changes in temperature refractory parts of the uneven temperature, there will be stress inside the masonry and fission and spalling of the material. Therefore, refractory materials should have the ability to resist such damage.

4, strong slag resistance. Refractory materials in the use of the process, often by high temperature slag, metal and furnace dust chemical attack. Therefore, refractory materials must have the ability to resist erosion.

5, high temperature and volume stability. Refractory materials in the long-term high temperature use, the brick body will produce the volume contraction or expansion, resulting in the refractory brick damage. Therefore, refractory materials are required to be stable in volume at high temperature.

6, structured dimensions, tolerances should be small. Although the refractory brick masonry brick filled with refractory mud, but the density and intensity are worse than the refractory material in the drying process and easy to fall off, so the brick is the weak link masonry, easy to leak and erosion Therefore, the smaller the seam size, the smaller the better. Only the accurate dimensions can meet this requirement. Therefore, the refractory material can not have the defects of big distortion, lack of edge, notch, cave and crack, etc. Claim.

2017年11月21日星期二

Focus on the refractory industry and optimize the structure

Since 2000, China's refractory industry has entered the fastest-growing stage and is now the world's largest producer and exporter of refractory materials. European Refractories Manufacturers Association survey of the global refractory production in 2011 showed that the global refractory output in 2011 was 42,750,000 tons, of which, China's refractory output was 29,500,000 tons, accounting for 69% of the global output.



With the relative trend of the company's shares Pu-resistant shares, Beijing Lill major innovation ability and technology and equipment levels have improved significantly, China's refractory industry in the international market, the advantages and status of refractory material has also been greatly improved. At present, the varieties and aggregates of refractory products in our country not only meet the needs of domestic high-temperature industrial production and development, but also increase their export volume year by year. The market covers more than 150 countries and regions in Asia, Europe and the Americas, and the export volume has been ranking the world for many years the first.

At present, China's refractory products industry will focus on the development of product structure optimization, focus on extending the industrial chain and enhance the overall competitiveness of industries; vigorously develop the deep processing of products, improve product added value and technical content, improve product quality; focus on the development of a safe, Environmental protection, energy saving, noise reduction, leakage prevention and other functions of new building materials and products to meet the needs of green building development.

Refractory products industry will speed up the development of inorganic non-metallic materials to support the development of strategic industries, promote joint reorganization, optimize the industrial layout, strengthen energy consumption, strict environmental management, development of high-end products, encourage technological innovation, eliminate backward production capacity and strengthen safety Production and other eight tasks, to refractory products listed companies and listed companies has brought new opportunities.

2017年11月16日星期四

Refractory production process introduction, glass technology

According to the degree of compactness and shape of different products, there are sintering, casting and melt casting method.



Sintering method is to pre-burn the department of raw materials into clinker, crushing and screening, and then press a certain ratio and raw materials mixed by forming, drying and firing.

Casting method is the raw materials through mixing ingredients and fine grinding and other processes, melting at high temperatures, direct casting, cooling and crystallization, annealing products.

Their compact body, high mechanical strength, high temperature structural strength, slag resistance is good, the scope of use continues to expand. Melt blowing method is to melt the ingredients, the high pressure air or superheated steam injection, so that the dispersion into fibers or hollow ball method.

Products are mainly used as light refractory, heat insulation materials, but also made of powder or granular amorphous refractories, temporary use of tar, asphalt, cement, phosphate, sulfate or chloride binder bonding, without Forming and sintering directly.

2017年11月14日星期二

Refractories enterprises facing difficulties and countermeasures

At present, the production environment of refractory materials is not optimistic. The main reason is that the products produced by high-temperature industries such as steel, nonferrous metals, glass and cement are in surplus. The market for refractory materials is reduced. The competition among similar enterprises in the industry is harsh. At the same time, Concerned that the financing difficulties, coupled with the difficulty of funds back to the production of enterprises has brought great difficulty, if we encounter several bad debts bad debts of users, enterprises will be difficult to survive. Thus, refractory companies how to survive and develop? Has become a topic of discussion in the industry.



In the current severe situation, refractories enterprises should also maintain a calm state of mind, to judge the situation with the new normal, pointed out that enterprises should face the problems and put forward countermeasures and suggestions:

First, the major enterprises, especially high-tech enterprises, should mainly focus on technological innovation, and give priority to considering the functionalization of refractory materials as a precondition, planning technical solutions for customers, and solving the energy-saving and environmental protection problems in their process or furnace equipment, and extending their use life.

The second is to recognize and see the adverse consequences brought by the severe competition of similar homogeneous enterprises to the enterprises and industries. With the leading products of coke oven silica brick, coal chemical industry with high-chrome brick, electrolytic silicon carbide with silicon carbide brick, cement kiln with the past of chromium-containing materials to the current spinel series of materials, ladle castable, heating Furnace castable series materials, the production of its own high-tech products to solve the user's key technical equipment problems, and equipment imported refractory configuration, instead of imported materials to promote technological progress, but the results of long-term competition everyone Not much money, low profit production. It is very necessary to conduct various exchanges and exchanges in various fields between refractory enterprises. Of course, such cooperation is voluntary. Competition is inevitable in the market and has made a contribution to society.

Third, in the current market situation, how to develop the business, is to enter or return temporarily suspended? All enterprises should be based on their own circumstances, depending on the degree of dependence on the market users of your products, according to the company's technology and equipment, management team, technical strength, capital strength and other aspects of a comprehensive choice.

2017年9月28日星期四

Refractory material production process introduced

According to the degree of compactness and shape of the product, there are sintering method, casting method and melt injection method. Sintering method is the raw materials of raw materials pre-baked clinker, broken and sieved, and then by a certain ratio and raw materials mixed, through the molding, drying and firing.



Casting method is the raw materials through the ingredients mixing and fine grinding process, in the high temperature melting, direct casting, cooling crystallization, annealing products. Their body is dense, high mechanical strength, high temperature structural strength, good slag resistance, the use of the range continue to expand.

The melt blown method is a method in which a batch is melted and then blown into a fiber or a hollow sphere by blowing it with high pressure air or superheated steam. Products are mainly used for light refractory, heat insulation materials, but also made of powder or granular amorphous refractory, temporary use of tar, asphalt, cement, phosphate, sulfate or chloride and other bonding agent cement, without Forming and sintering directly.



2017年9月25日星期一

Characteristics of Global Refractory Industry Development

At present, the global production of refractory materials is about 45 million tons, China's refractory production accounts for about 65% of the world's total refractories, other production is mainly concentrated in the EU, CIS, the United States, Japan and South Korea and other countries and regions.



Global refractory industry development has the following characteristics:

1.Through the mergers and acquisitions, reorganization and elimination of backward to improve the concentration of refractory industrial production

Developed countries since the nineties of last century, mergers and acquisitions, restructuring and operation in the market economy in the natural phase out, so that the rapid increase in production concentration, such as Japan in the 1950s, more than 100 refractory production enterprises, for decades, through mergers and acquisitions , Reorganization and collapse in the market economy tide, trademark cancellation and other forms, so far, only more than 60 refractory enterprises. Another example is the 1970 US 7 independent refractory production enterprises, through several mergers and acquisitions, merged into a company in 2001, that is, "RHI refractories."

2.The total amount of refractory material gradually weakened, the product added value steadily improved
In the premise of the relatively stable demand for refractory materials, due to the continuous adjustment of refractory variety structure, product quality continues to improve, will reduce the demand for refractory materials, but the value-added products is still steadily improving.

Developed countries such as the United States, Japan and Europe have shown a positive growth trend in the growth rate of sales of refractories and higher than the growth rate of refractory production. In particular, some countries refractory production declined year by year, while sales revenue grew year by year.



3.Refractory industry to the formation of large enterprise groups direction

At present, through hundreds of mergers and acquisitions and corporate self-development, refractory industry formed a number of large enterprise groups. Large-scale enterprise groups to make the degree of intensive production, industrial chain gradually extended, and use its strong economic and technological strength and brand advantage, in order to seek greater profit margins.

2017年9月21日星期四

Present Situation and Technical Progress of Refractory Materials in China

Reform and opening up more than 30 years, China's refractory industry has made great progress. China's refractory production ranks first in the world, refractory quality and variety has also been greatly improved and developed, refractory technology is also rapidly close to the international advanced level. However, China's refractory industry, there are still many problems, such as: high consumption of refractories; refractory production plants, low concentration; refractory product quality and poor stability; innovation is not enough; research and development work mainly concentrated in the material formula - composition - structure and performance, while the production process control and the use of refractory material is not enough attention.

At present, China's economic development has entered a transition period. Refractory users a large number of excess capacity, economic benefits, environmental requirements are increasingly stringent. These have caused great difficulties for refractory enterprises. The reasons for these problems are multifaceted, and the transformation of China's national economic development model, but also with the refractory industry itself is closely related to the problem. For example, the existence of a large number of small and medium enterprises that technological advantages and large-scale production advantages and did not give full play to the low level of small and medium enterprises to survive opportunities. The production of these problems and production management, scientific and technological progress and refractory workers thinking and other factors, can not be quickly resolved.



In the field of materials, refractories are a small, traditional branch, and it does not get enough attention. It is indispensable basic material of the national economy, but also the most complex microstructure of the material. It has the characteristics of multi-component, multi-particle and heterogeneous composite structure, and it is much more difficult to study the structure than other materials. Therefore, both from the number and depth of research than other materials behind, the development of science and technology is relatively slow. Looking back over the past half century, there are only two important technologies that affect the development of refractory materials.

2017年9月18日星期一

Brief Analysis on the Characteristics and Classification of Refractory Materials

Refractory material is refractory not less than 1580 ℃, have good resistance to thermal shock and chemical erosion, low thermal conductivity and low expansion coefficient of non-metallic materials. Refractory degree refers to the refractory cone specimen in the absence of load conditions, resistance to high temperature effect without softening the melting of the Celsius temperature.

Category:
(1580 ~ 1770 ℃), high-grade refractory materials (1770 ~ 2000 ℃) and special refractory materials (above 2000 ℃); according to the chemical characteristics of acid refractory materials, according to the chemical characteristics of refractory materials, Neutral refractory materials and alkaline refractories. In addition, there are refractory materials for special occasions.



Ingredients:
Acid refractory material to silicon oxide as the main component, commonly used silica brick and clay brick. Silica brick is silicon oxide containing more than 94% of the silicon products, the use of raw materials are silica, waste silicon brick, and its anti-acid slag erosion ability, load softening temperature is high, repeated calcination volume does not shrink, or even slightly inflated; But it is susceptible to alkaline slag erosion, poor thermal shock resistance. Silicone brick is mainly used for coke oven, glass melting furnace, acid-making steel furnace and other thermal equipment. Clay brick with refractory clay as the main raw material, containing 30% to 46% of alumina, is a weak acid refractory, heat shock resistance, acid slag corrosion resistance, widely used.

Neutral refractories with alumina, chromium oxide or carbon as the main component. Alumina containing 95% or more corundum products is a wider use of high quality refractories. Chromium brick as the main component of the steel brick on the corrosion resistance of steel slag, but the thermal shock resistance is poor, high temperature load deformation temperature is low. Carbon refractories are carbon brick, graphite products and silicon carbide products, the thermal expansion coefficient is very low, high thermal conductivity, good thermal shock resistance, high temperature strength, acid and salt erosion, especially weak acid Better resistance, from metal and slag wetting, light weight. Widely used as high temperature lining materials, but also for oil, chemical kettle lining.

Alkaline refractory materials to magnesium oxide, calcium oxide as the main component, commonly used is magnesium brick. Magnesium oxide containing 80% to 85% magnesium oxide is very resistant to alkaline slag and iron slag, and the refractoriness is higher than that of clay brick and silica brick. Mainly used for flat furnace, oxygen converter, electric furnace, non-ferrous metal smelting equipment and some high-temperature equipment.

Refractories for special applications include high temperature oxide materials such as alumina, lanthanum oxide, beryllium oxide, calcium oxide, zirconia and the like, refractory compound materials such as carbides, nitrides, borides, silicides and sulfides Etc .; high temperature composite materials, mainly metal ceramics, high temperature inorganic coating and fiber reinforced ceramics.

Common refractories:

Frequently used refractory materials are AZS brick, corundum brick, direct combination of magnesia-chrome brick, silicon carbide brick, silicon nitride combined with silicon carbide brick, nitride, silicide, sulfide, boride, carbide and other non-oxide refractories ; Calcium oxide, chromium oxide, alumina, magnesium oxide, beryllium oxide and other refractories.

Frequently used insulation refractories are diatomaceous earth products, asbestos products, thermal panels and so on.



The refractory refractory material is made of refractory refractory, refractory castable, refractory castable, refractory castable, refractory castable,

2017年9月14日星期四

Environmental significance of composite refractory materials

The composite refractory material has been developed rapidly in recent years because of its high strength and low density, which is a kind of popular material instead of steel production. In particular, the technology of glass fiber reinforced composite refractory has been mature and In the automotive industry has been a lot of applications. However, the glass fiber is harmful to the human body and is easy to be bonded after melting, resulting in difficulty in recycling.

The natural fiber is recyclable, biodegradable, available, renewable, incineration when no toxic emissions, landfill biodegradable, and can be recycled; natural fiber can be used one-step molding, bonding with other materials Easy, the production process generally do not use adhesive. So natural fiber is environmentally friendly materials. Natural fiber in the energy advantage is also very obvious, such as Ma fiber growth period is short, the growth environment is not high, the growth process without pesticides and fertilizers. Natural fiber in the growth, harvest and processing of energy consumption less, the production process without "three wastes" pollution, the use of the process without harmful free chemical precipitation.



In addition, natural fiber composite refractories generally use polyester or polypropylene as the base resin, the use of wood fiber, hemp fiber and other natural fibers (straw, bamboo, sugar cane, coconut shell, etc.) as a reinforcing material. Substrate resin is cheap, fiber raw materials from a wide range of prices are also very low, so the natural fiber composite refractory materials have other composite materials can not match the price advantage. Moreover, the strength of natural fiber composite refractories is also higher than the glass fiber composite refractory, the use of natural fiber composite refractory instead of glass fiber composite refractory manufacturing auto parts can achieve 5% to 15% of the lightweight.

Now, the production of natural fiber composite refractory materials and products have been developed, because the use of direct extrusion injection molding process, so the composite material only experienced a heating process, which can reduce the natural fiber such heat sensitive materials heat degradation. Production of automotive exterior trims (including hoods, spoilers and fenders, etc.) is produced by on-line production using extrusion molding or extrusion molding.

In short, the natural fiber reinforced composite refractory material is a very promising environmentally friendly materials. According to expert evaluation, 5 years after its application will exceed the glass fiber.



2017年9月11日星期一

China Glass Refractory Materials development analysis on the overall situation

Over the past decade, China's glass industry with refractory materials have made great progress, integrated in the large-scale float glass kiln kiln, from 3 to 4 years to 5 to 8 years, and all the materials to achieve the localization, greatly Narrowing the gap with the advanced level of foreign countries, for the glass industry with the future development of refractories, laid a solid foundation. But with the further development of the glass industry needs and foreign advanced level, there are still many problems to be solved.

China's accession to the WTO, foreign high-quality low-cost products can drive straight into the same time, China's quality products into the international market has become more convenient. Seize the opportunity to seriously analyze China's glass industry refractory problems and the gap with the world's advanced level, to take the right countermeasures, as soon as possible to narrow the gap with the developed countries, catch up with the world's advanced level, which will be our response to WTO challenges Best response. The following will be based on the current main problems, combined with the future development of thinking, put forward some suggestions.



First, bigger and stronger with strong technical innovation strength and international competitiveness of the Ministry of Industry and Trade integration of large supporting refractory leading enterprises, so as to enhance the overall level of the industry, driving the development of the industry as the dominant force.
At present, the glass industry refractory industry there are many enterprises, small scale, decentralized, low-level redundant construction, their own war, the market disorderly competition and so on, resulting in the overall level of the industry to improve slowly. In recent years, China has built more than 30 refractory refractory enterprises, these enterprises in recent years despite the majority of different degrees of progress, but most of the smaller production scale, weak technical force, backward technology and equipment , Product quality is difficult to guarantee. Sintered refractories have a similar situation. Thus forming a common product over the one hand, on the other hand high-end products still need to import the situation, and because of these enterprises cheap dumping, resulting in market chaos, a backbone enterprises to improve product quality barriers. Therefore, there is an urgent need for strength of the industry and trade integration of refractory companies,just like Zhengzhou Shixing Special Refractory Co., Ltd.It is guaranteed to provide reliable quality refractory refractory materials. This kind of company can use its own strong strength to integrate resources, bigger and stronger, and guide the industry to continuously improve the overall level, climb the new peak. The so-called bigger is the company to have their own control of a certain size of cast refractories, alkaline refractories, silica brick, zirconium, zirconia corundum, sillimanite, mullite refractories and new unshaped refractory production base And supporting system, can provide the whole kiln quality supporting refractory materials to meet the entire glass industry, including the glass fiber industry, the demand for refractories. The so-called strong, is to rely on the new strong, make full use of strong technical advantages, continuous technological innovation, enhance the overall level of the industry, making it an international competitiveness of large refractory supporting companies.

Second, the design of glass melting furnace, the production of refractory materials, the operation of the furnace, maintenance, use and refractory production and use of scientific research between the four closely, is to extend the kiln kiln, as soon as possible to reach the international advanced level One of the important conditions.
To extend the kiln kiln must have two conditions: First, the integration of industry and trade supporting the refractory company, to provide all kinds of high-quality refractory refractory materials; the second is to design, production, use and research Close combination, to play their respective advantages, so that the whole kiln refractory configuration more reasonable, especially the kiln more than 8 years old kiln, has not entirely rely on to improve the quality of refractories can be achieved. Superb design, careful operation, maintenance and management of quality and supporting the supply of refractory materials must be closely integrated in the past, the kind of each tube for a period of non-communication, disconnected from each other, the lack of the overall concept of the situation is the long melting of the kiln kiln One of the important reasons.



2017年9月7日星期四

Selection and Masonry for Glass Furnace Refractory

1. dense chrome brick

It has the best anti-high temperature E glass erosion performance, the erosion of the glass is basically no pollution, it has become E glass unit kiln preferred high-quality refractory brick.

The main technical indexes are Cr2O3 content> 94%, porosity <15 bulk="" density=""> 4.24g / cm3, and the erosion loss is only 1/10 of that of dense zirconium brick. The In the E glass kiln kiln unit kiln directly contact the high temperature glass liquid melting part of the wall, the melting part of the high temperature parts of the bottom, the main channel wall and the bottom of the pool, the transition channel wall.



2. dense zirconia brick

The corrosion resistance of the brick is slightly lower than that of the dense chrome oxide brick, and the isostatic pressing method is used. The technical index is ZrO2> 65%, the apparent porosity is less than 2.0%, the bulk density is about 4.25g / cm3, E glass in the temperature of more than 1370 ℃ there is erosion. The bottom of the melting part, the transition path, the bottom of the forming channel, and the flow path and the trough and the trough of the molding glass are used in the E glass kiln. In addition, dense zircon bricks are also used as a backing brick for dense chrome bricks.

In recent years, many refractory enterprises in China have also introduced foreign technology and equipment, but also produced the use of isostatic pressing molding sintered dense zirconium brick, has been the domestic glass, glass furnace furnace part of the application.

3. Standard zircon brick

The brick ZrO2 content of about 66%, bulk density of 3.7g / cm3, with good thermal stability and anti-peeling. The use of the powder in the erosion of the more serious mouth of the mouth of the mouth and the back wall, melting furnace observation hole brick and access to the flame of the chest wall and roof brick, burner brick. But there are also the use of AZS burner brick and the use of mullite brick for the transition brick and kiln side of the gap brick.

4. sintered mullite tiles

The chemical composition of the brick is Al2O3> 74%, SiO22.2%. Bulk density of 2.5g / cm3, the main purpose is the standard chrome lining brick, melting the chest wall and the front wall, access flue lining brick, large arch and foot outlet mouth outside the brick, heat exchanger entrance flue outside the wall Wait. There is also a mullite brick which is melted by mullite crystal and has better anti-high temperature creep and heat shock resistance. It can be used as kiln large and flame space chest wall. The effect is very good, the current localization has also been successful.

5. Fused zirconia corundum brick (AZS brick)

The chemical composition of the brick is ZrO234%, Al2O349.2%, SiO2 15.9%. Bulk density of 3.85g / cm3, the main purpose is to melt the mouth of the mouth of brick and brick mouth.

6. Fused chrome corundum brick

The chemical composition of the brick is Cr2O328.3%, Al2O358.3%, MgO, Fe2O35.2%. Bulk capacity of about 3.4g / cm3. Mainly used in the heat exchanger at the entrance of the flue interface brick.



2017年9月4日星期一

The necessary road for Refractory Materials Industry in China

Last year, China's energy-saving environmental protection industry output value to reach 4.5 trillion yuan, and proposed to strengthen energy-saving technological transformation, the implementation of pollution control key projects to promote the park recycling, speed up urban environmental infrastructure construction, green building operations. The development of energy-saving environmental protection industry can be described as multiple purposes, both can help to achieve ecological civilization, promote long-term economic growth, sustainable growth, but also improve people's living environment and improve people's quality of life. Therefore, the development of energy-saving environmental protection industry, is to take the road of sustainable economic development.



Energy saving and environmental protection Refractory material is a new industry, is to adapt to people's consumption structure of a new technology integration of the industry. The development of energy-saving environmental protection refractory industry in line with the world trend. People need fresh air, clean water, non-polluting food, people need a good living environment. This is the development of energy-saving environmental protection refractory industry has become the fundamental reason for the world trend and the fundamental driving force. At the same time, we should see that the development of energy-saving and environmental protection refractory industry itself, but also the need for continuous production of technical factors, the result is not only to promote energy-saving environmental protection industry's own development, but also to accelerate the country's technological progress is also of great benefit.

Energy-saving environmental protection refractory industry market size is very large, for a long time, developed countries accounted for one of the main share. The world's major developed countries have always attached great importance to the development of energy-saving environmental protection refractory industry. China to develop energy-saving environmental protection refractory industry in line with the world trend, to optimize the industrial structure and consumption structure has an important role.



As we all know, the German government and the market in promoting energy-saving environmental protection refractory industry development is unique, is sparing no effort to strengthen the enterprises and residents of the awareness of energy conservation and environmental protection, in the greatest possible circumstances the development of environmentally friendly technologies and environmentally sound products and production processes. These two points are particularly worth learning from China. Some of China's enterprises and individuals awareness of energy conservation and environmental protection is not strong, governments at all levels should further increase the concept of energy conservation and environmental protection efforts to promote the concept of energy conservation and environmental protection really enjoys popular support, so that energy-saving environmentally friendly refractory products, consumer demand will increase, the results Is conducive to energy-saving environmental protection refractory products to expand the scale of production and energy-saving environmental protection technology development, improvement and promotion.

2017年8月31日星期四

Analysis on the Development of Glass Industry Refractory in China

Over the past decade, China's glass industry with refractory materials have made great progress, integrated in the large-scale float glass kiln kiln, from 3 to 4 years to 5 to 8 years, and all the materials to achieve the localization, greatly Narrowing the gap with the advanced level of foreign countries, for the glass industry with the future development of refractories, laid a solid foundation. But with the further development of the glass industry needs and foreign advanced level, there are still many problems to be solved.

After China accession to the WTO, foreign high-quality low-cost products can drive straight into the same time, China's quality products into the international market has become more convenient. Seize the opportunity to seriously analyze China's glass industry refractory problems and the gap with the world's advanced level, to take the right countermeasures, as soon as possible to narrow the gap with the developed countries, catch up with the world's advanced level, which will be our response to WTO challenges Best response. The following will be based on the current main problems, combined with the future development of thinking, put forward some suggestions.



First, bigger and stronger With strong technical innovation strength and international competitiveness of the Ministry of Industry and Trade integration of large supporting refractory leading enterprises, so as to enhance the overall level of the industry, driven by the development of the industry as the dominant force.

At present, the glass industry refractory industry there are many enterprises, small scale, decentralized, low-level redundant construction, their own war, the market disorderly competition and so on, resulting in the overall level of the industry to improve slowly. In recent years, China has built more than 30 refractory refractory enterprises, these enterprises in recent years despite the majority of different degrees of progress, but most of the smaller production scale, weak technical force, backward technology and equipment , Product quality is difficult to guarantee. Sintered refractories have a similar situation. Thus forming a common product over the one hand, on the other hand high-end products still need to import the situation, and because of these enterprises cheap dumping, resulting in market chaos, a backbone enterprises to improve product quality barriers. Therefore, the urgent need for strength of the industry and trade integration of the refractory company, to ensure the quality of reliable quality supporting refractory materials. This kind of company can use its own strong integration of resources, bigger and stronger, and guide the industry to continuously improve the overall level, climbing new peaks. The so-called bigger is the company to have their own control of a certain size of the cast refractories, alkaline refractories, silica bricks, zirconium, zirconia corundum, sillimanite, mullite refractories and new unshaped refractory production base And supporting system, can provide the whole kiln quality supporting refractory materials to meet the glass industry, including the glass fiber industry, the demand for refractories. The so-called strong, is to rely on the new strong, make full use of strong technical advantages, continuous technological innovation, enhance the overall level of the industry, making it an international competitiveness of large refractory supporting companies.

Second, the design of glass melting furnace, the production of refractory materials, the operation of the furnace, maintenance, use and refractory production and use of scientific research between the four closely, is to extend the kiln kiln, as soon as possible to reach the international advanced level One of the important conditions.



To extend the kiln kiln must have two conditions: First, the integration of industry and trade supporting the refractory company, to provide all kinds of high-quality refractory refractory materials; the second is to design, production, use and research Close combination, to play their respective advantages, so that the whole kiln refractory configuration more reasonable, especially the kiln age of more than 8 years of high-grade melting pot, has not entirely rely on to improve the quality of refractories can be achieved. Superb design, careful operation, maintenance and management of quality and supporting the supply of refractory materials must be closely integrated in the past that the tube of a section, do not communicate with each other, out of touch with each other, the lack of the overall concept of the situation is the long melting of the kiln kiln One of the important reasons.

The current problem is how to implement? Who will be implemented, first of all by the combination of the four parties? According to past experience, with strong technical strength of the industry and trade integration of refractory materials supporting the company most suitable, on the one hand, Refractory material performance and data to master, you can recommend to the design and use of various ancillary programs to choose from; on the other hand to the use of the Department to provide the required variety of quality supporting refractory materials, and tracking the use of, constantly To provide users with services to help solve the problems that may arise in the use of the Quartet string together, often communicate, complement each other to form a whole, together to improve the kiln kiln and the relevant technical and economic indicators and efforts. Of course, industry associations should also give full play to the industry self-discipline and industry coordination functions, the industry elite to achieve this goal together.

2017年8月28日星期一

News about the development of Glass Refractory Industy in China

The development of refractories has three main drivers: to maintain and improve the quality of the glass; the economic requirements of the glass furnace to make the kiln longer operating cycle and the use of pure oxygen combustion system after the impact and impact.

The current changes in the electronics industry and the computer industry can be interpreted as months or weeks, and when it comes to the development and application of refractory materials in the glass industry, it can easily be interpreted as five or ten years. According to this concept of time, we will review and discuss changes that have taken place in the "future" (more conservative pace) in the "current".



There are three main drivers for the change and development of refractory materials. The first is the need for glass manufacturers to maintain at least to maintain the quality of the glass. The second is the economic requirements of the glass furnace to make the kiln run longer, and the third is the pure oxygen combustion system to bring the impact and impact. These three requirements usually determine the use of improved refractory materials in the kiln. These drivers also enable glass manufacturers to use improved refractory products during kiln maintenance and use and new technologies for extensive maintenance during the run cycle.

The molten cast alumina brick has been used in this part of the melting tank to build its application, mainly in the melting of high quality glass pure oxygen burning furnace furnace has been applied. Prior to the advent of pure oxygen combustion technology, only beta-alumina bricks were used to melt the superstructure of the pond, and no molten cast alumina bricks were used on top of the melting tank. Now, fermented cast products, whether beta-alumina or alpha-beta alumina, are used in the production of color television (screens and cones), float glass, and borosilicate glass in part or all of the furnace on. The molten cast AZS brick can generally be used at 1600 ° C or 1650 ° C (depending on the glass product), while the furnace with a fused alumina brick can be successfully operated at 1700 ° C. This creates better conditions and greater flexibility for glass manufacturers in the production of refractory glass.

For many years, molten cast AZS furnaces have been successfully tested for cooling and reheating so that they can use multiple operating cycles. Now a little experience has been gained in the successful implementation of the fused alumina furnace top cooling and reheating, when they use two or more operating cycles to show more economically viable vitality. The results of the fused alumina furnace tops observed during use (thermal observation and shutdown observation) show that these materials are both chemically stable and mechanically stable. This was the earliest observation of this masonry, since there was no reference material for fused alumina at the time and no empirical basis for its application at the top of the furnace.



High chromium refractory products used in the past mainly used to enhance the glass melting furnace, and a small amount used in the insulation glass pool furnace. Now high-chrome bricks are being used more and more by some soda-lime glass pits. Its main use is not limited to all or part of the flow hole, but also for the end wall and to a limited extent for the feed mouth of the angle brick. For the components of high chrome tiles, they are potentially tedious, so that high chromium products are usually not compatible with very "white" glass. The initial period of this product is mainly used for colored glass, but now high-chromium products have also been successfully used in a transparent container glass furnace. The amount of high chromium products used in glass furnaces depends to a large extent on the design of their flow holes, the cooling of the liquid bath, the daily production of the furnace, and the operation of the furnace. A glass manufacturer may use high chrome tiles for all cover plates plus the end wall of the melting tank. The flow of high-chrome brick masonry provides the potential to increase the life of the kiln because the corrosion resistance of most of the material to the glass is at least twice that of the molten AZS. However, some of the design and operating parameters are different from the molten AZS brick, it is necessary to discuss with the supplier.

2017年8月24日星期四

The main problems faced by Glass Industry Refractory Materials

The main problems faced by Glass Industry Refractory Materials is the development of low temperature melting. Arsenic-free material melting process, the whole oxygen combustion technology and the development of electric melting technology, refractory material to make more stringent requirements.

Recent years, the life of glass melting furnace has been greatly improved, the production of flat glass float production line up to 10 years, ordinary glass melting furnace life of 5 to 7 years, special glass melting furnace life of up to 2 years , So the refractory material must have high resistance to erosion, the impact on the glass quality is small, the environment does not cause pollution, quality and energy saving effect is obvious and other functions.



In order to improve the quality of glass, refractory materials in addition to the use of the traditional No. 1, No. 36, No. 41 zirconia corundum brick (AZS), a 94% zirconium oxide casting brick (ZFC) has also been developed. This high zirconia cast brick has better performance than AZS bricks. Such as less glass phase, anti-glass erosion, greatly reducing glass products such as bubbles, stones and other defects. Therefore, this cast brick can be adapted to a variety of glass melting, such as aluminum silicate glass, electronic glass and boron - silicate glass.

In order to adapt to the development of electrofusion technology, the researchers developed a 90% zirconia-containing cast brick (ZFCR), the high temperature resistivity is ZFC cast brick 10 times. Thus showing excellent resistance to erosion.

2017年8月21日星期一

Glass Kiln Refractory's Technology Evaluation and Development Trend in China

China's glass kiln refractory material development, will continue to focus on the life of glass melting furnace, glass product quality and cost, energy consumption and environmental protection and other aspects, that is, glass kiln refractory materials are facing the main problem is low temperature melting development of.

With the glass melting furnace oxygen-rich combustion, oxygen burning, arsenic-free material melting process and electric welding technology to promote the use of refractory materials, especially cast refractory materials put forward higher requirements.

With the development of science requires a higher performance of refractory materials, which also need to develop more new refractories, and the corresponding evaluation techniques. In short, the maximum to meet people's production needs.

Technology Evaluation of Glass Kiln Refractory
1.Continuous bubble experiment
Continuous bubble experiment is a method of directly observing the bubbles occurring at high temperature. By recording the aging at high temperature into a television image, it is possible to observe the occurrence of bubbles of refractory material for a long time and continuously, and to carry out a method of making a bubble closer to the actual kiln Evaluation. Since the aging change can be measured, the bubble generation rate of the refractory material represented by the following formula can be measured. This is from the unit area of ​​refractory material that the number of bubbles per unit time, can be more accurate evaluation.
2. Corrosion resistance
Corrosion test methods for refractory materials for glass fines, with dynamic erosion test methods and static erosion test methods. The former generally use the rotary erosion test method, which generally use finger test and clamp vortex test method. However, these methods are not likely to exhibit good corrosion resistance with good reproducibility for all refractory materials and glass, and it is desirable to have a good reproducibility test method in order to compare the corrosion resistance of the refractory to the glass. 3. Volatile steam test

From the viewpoint of reducing NOX and energy saving, oxygen combustion technology is noticeable. When the amount of combustion exhaust gas is reduced to about one fifth when the combustion from air combustion to oxygen is carried out, the concentration of volatile matter such as R2O, B2O3, PbO, and SiO in the upper space of the glass kiln is greatly increased and the water vapor partial pressure is increased. The increase in the concentration of these volatile components and the increase in water vapor partial pressure, such as Na2O as NaOH, will tend to further increase its erosivity, accelerate the erosion of the upper space refractory material, affecting the life of the kiln. Therefore, it is important to select a test for evaluating the refractory material for the upper space when oxygen is used.



Development Trend of Refractory Material Production Technology
1. More widely used synthetic raw materials and selected minerals as refractory materials to improve the purity and density of raw materials, it is estimated that the use of such raw materials will reach about 30%.
2. In the processing process, to further strengthen the raw materials and semi-finished products of physical and chemical effects, such as the use of ultra-fine grinding machine for fine grinding, mixing equipment, highly uniform, the use of fused raw materials to strengthen the interaction of components, High pressure molding and according to the refractory material structure and performance to improve the firing temperature.
3. Widely used composite materials to strengthen the refractory structure of the grain boundary parts, to the direction of high-performance ceramic development.
4. Develop energy-saving non-fired products and unshaped refractories through low-temperature treatment and various bonding agents (ceramic suspension, colloidal solution, tar, etc.).
5. Study and make full use of the chemical properties of carbon and the interaction between carbon and other components and various additives that can affect fire resistance.

The Shixing company is adopted on producing high quality Fused Cast AZS Block used in glass furnaces. Established to produce series of shaped blocks Fused Cast AZS-33# Block, Fused Cast AZS-36# Block and Fused Cast AZS-41# Block with annual production capacity 20,000 tons/year. New materials production zone is equipped with two high-temperature shuttle kilns, mainly producing Zircon Brick, Silica Brick, Magnesia Brick, etc.

2017年8月17日星期四

Glass Refractory Industy news and the best glass refractory supplier from China

Modern glass production technology compared with the traditional process has been a qualitative leap, towards a higher efficiency, lower energy consumption, better product quality in the direction of continuous development. Kiln as the core of glass production equipment, its technical level is also progressing, widely used to improve the combustion strength, strengthen the heat transfer effect, reduce heat loss, reduce the product and environmental pollution and other new technologies. 

China's glass industry has developed rapidly, has long been the world's first glass production power. The rapid development of the glass industry, naturally promote the development of China's glass kiln refractory materials and technological progress. Modern glass production technology compared with the traditional process has been a qualitative leap, towards a higher efficiency, lower energy consumption, better product quality in the direction of continuous development. Kiln as the core of glass production equipment, its technical level is also progressing, widely used to improve the combustion strength, strengthen the heat transfer effect, reduce heat loss, reduce the product and environmental pollution and other new technologies. The technological progress of the kiln requires a variety of quality refractory materials as a guarantee condition, requiring refractories to withstand higher temperatures, more abrupt temperature changes, more intense chemical erosion, more severe stress damage, and only supporting the use of multiple varieties High-quality refractory materials, kiln new technology, energy efficient, low pollution and other advantages can be achieved. High-quality refractory materials for modern high-temperature technology is not only consumable materials, but also to achieve high-temperature new technology necessary functional materials. 



Foreign refractory materials for glass kilns 

1.AZS and high zirconia brick
On the melting of AZS brick is to improve its anti-erosion and wear resistance of the production process, in addition to the oxidation method of melting, so that the product carbon content down to 0.005%, glass phase precipitation temperature increased to 1450 ℃ outside. The casting and annealing processes have also been improved to produce fused AZS with little or no shrinkage. ZrO2 content of more than 90% of the high zirconia brick, the thermal shock performance is very good, such as ZrO2> 95%, SiO2 <1.4%. Stabilizer <3.7% of high zirconia brick, the bulk density of 4.7g / cm3, porosity <18.4%, thermal shock resistance from room temperature to 1400 ℃ (15 minutes interval) up to 15 to 20 times. Japan produces a cast zirconia brick with a zirconia content of> 90%, called ZFC brick, and its corrosion resistance is better than ZrO2 content of 40% of the AZS brick, at 1500 ~ 1600 ℃, 16 hours after the glass phase Precipitation, little pollution on the glass, after 800 ~ 1250 ℃ thermal shock resistance test 40 times without cracks. 

2. Chrome brick and chrome brick
To the static pressure molding of dense chromium oxide brick for E glass and C glass cell kiln wall, card or other parts of the erosion of serious, life expectancy of up to 6 to 7 years. In recent years, chromium products have made new progress, such as the addition of Cr2O3 in AZS brick to form Al2O3-ZrO2-SiO2-Cr2O3 refractory, at high temperatures, Cr2O3 on the one hand and Al2O3 to form a solid melt, on the other hand because Cr2O3 is The high melting point material, which enters the glass phase of the brick, increases the viscosity of the glass phase, thereby increasing the exudation temperature of the glass phase and greatly increasing the glass resistance to glass. A US company produces a re-bonding AZS / Cr2O3 refractory, its chemical composition and physical properties is excellent, compared with the original Al2O3 / Cr2O3 material, the annual furnace to reduce power consumption 4%, yield increased by 15% The cost is reduced by 3.75%, the glass quality is not affected, the kind of brick can be press molding, hand pound molding or isostatic pressing, and then high temperature sintering. 

3. Basic bricks
The high purity directly combusted alkaline brick at 1800 ℃ is widely used in regenerative walls and arch. Germany has introduced a new material named RUBINAI · EZ with its chemical composition of MgO 75%, ZrO213.5%, SiO29 .5%, it is zirconite with the combination of magnesite bricks, in the early sintering, brick structure of zirconium silicate and magnesium oxide, along the granite around the formation of a layer of forsterite and zirconia protective layer, This structure greatly improves the brick anti-alkali and anti-sulfate erosion performance, do the middle of the thermal storage room lattice brick effect is good. 

4. Olivine magnets
The olivine-binding phase has a particularly strong resistance to erosion, and the corrosion resistance of the magnesium brick can be improved by increasing the forsterite content in the magnesium briquette phase. To this end, 20% of the perovaleite fines were added to the ingredients of the magnesium bricks to form a mortar-binding matrix that protects the magnesite particles and reduces the erosion. The brick price is relatively cheap, foreign has been used for a large number of glass kiln regenerator lattice in the middle. 

5. Barium fossil olivine brick
In view of the good erosion resistance of olivine and the lack of thermal shock resistance, the introduction of barium feldspar in its combined phase can obviously improve the thermal shock resistance of the brick. The barium feldspar is formed during the firing process and is present only in the bound matrix phase. When the content of barium feldspar is 15%, the best performance of silicon is about 1250 ℃. Studies have shown that barium feldspar can resist alkali and sulphate erosion. 

6. Unshaped refractories
Unstable refractory in the application of glass kiln is also a development trend. British use of refractory concrete prefabricated block masonry thermal storage room, lattice brick bottom arch, flue, small furnace pallets, burners, etc., greatly reducing the kiln structure of the joints, improve the furnace speed and shorten the cold repair time , France Xipu ERSOL ER1681 is based on ER1681 fused particles as the main component of the amorphous refractory series, and the use of electric frit with the bottom of the pool, its excellent anti-glass erosion, and the tendency to precipitate bubbles and the formation of stones Weak. Some of Japan's glass kiln bottom has all used ER2SOL series of unshaped materials. The theoretical research on refractory materials for foreign glass kilns revolves around how to further improve the anti-glass erosion and improve the mechanical properties in order to further extend the life of the kiln. 

7. Insulation material for glass kiln
Foreign glass kiln insulation widely used high alumina brick, lightweight silicon brick and fiber, mainly based on aluminosilicate fiber-based materials. In Germany, in addition to the use of diatomaceous earth, aluminosilicate and silicate fiber materials, widely used calcium silicate-based light products, in addition to Didier and the glass industry in close cooperation with the development of a composite board, It is made up of two materials, called "SSH" (Shood Supral H). The first layer in the composite panel has a thickness of 50 to 75 mm and is made of a relatively dense clay refractory. The thickness of the second layer is 100 to 125 mm. It is made of ultra-lightweight refractory (refractory clay or calcium silicate Material) made. The total thickness of the composite board is 150 to 200 mm, and the size of the composite board is the same as the size of the brick surface to be insulated. 

The CIS uses light phosphate concrete, fiber products and fillers. The binding agent for the light refractory granule filler is an aluminophosphate binder, the acid ratio of the binder is 2.3, the density is between 1.55 and 1.6 g / cm3, the particles are industrial Al2O3, artificial Al2O3, and the working temperature is 1800 ℃. Lightweight phosphate concrete is a kind of new type of lightweight heat-resistant concrete made of phosphate as binder and porous clay. The main performance parameters of light phosphate concrete are: density 800 ~ 1100kg / m3 , The compressive strength range is 7 ~ 12MPa, the thermal conductivity is 0.3 ~ 0.35W / cm · k, the long-term use temperature is 1270 ℃.

2017年8月16日星期三

Magnesia Brick - The best Magnesia Brick from China Zhengzhou Shixing Refractory

The magnesia brick are fused magnesia as main raw material, after a reasonable size distribution, high pressure forming, high-temperature sintering. The product has strong resistance to slag corrosion ability and high temperature dimensional stability. Mainly used in the regenerator, the upper part of glass furnace.

  The regular magnesia bricks are made from dense dead burned magnesia that makes the bricks in good refractoriness, corrosion-resistance, and widely used in checker chamber of glass tank, lime kiln, non-ferrous metallurgical furnaces, open heart furnace, iron mixer and EAF of steel-making, and also ferro-alloy furnace, etc.

  The bricks with MgO 95% or more in content take the secondary-burning dead burned magnesia or electrofused magnesia as the raw material and burned under the condition of ultra high temperature. They have the features of highly directly bonded and corrosion-resistance and widely used in various kinds of high temperature kilns and furnaces.



Physical and chemical for Magnesia Brick
Application:
1.The regenerative chamber for the ceramic frit kiln, sodium silicate and glass furnace
2.The furnace lining of iron and steel industry, such as ferroalloys furnace, metal mixer
3.The non-ferrous metallurgy industrial furnace lining, such as the furnace copper, lead, zinc, tin, etc
4.Calcining kiln, shaft kiln and tunnel kiln for refractory material industry
5.The lining for cement rotary kiln
Characteristics:
Excellent performance of basic slag resistance, high refractoriness, thermal stability, anti-erosion and anti-peeling
Excellent strength of pressure bending, abrasion proof
Excellent performance of high-temperature firing, high rates of associative property, anti-erosion ability
Excellent thermal shock resistance and spalling resistance
Excellent ability of high refractoriness, anti-erosion of alkaline residue
High temperature load of refractoriness under load. High mechanical strength
High temperature resistance excellent corrosion resistance
Resistance to spalling