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19 septembre 2017

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, 


15 septembre 2017

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.



12 septembre 2017

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. 

08 septembre 2017

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.

05 septembre 2017

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.


01 septembre 2017

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.

29 août 2017

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.

25 août 2017

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. 

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22 août 2017

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# BlockFused 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 BrickSilica BrickMagnesia Brick, etc.

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18 août 2017

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 ℃.