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The cause of damage to the hot blast furnace lining is that when the dust content and operating temperature are constant, the choice of clay bricks reflects the relatively low melting temperature of the product, which produces a thin glass layer on the surface of the bricks and penetrates deep into the interior through the capillary tube, with a larger Corrosion depth; the maximum static load at the bottom of the regenerator checker brick is up to 8kg/cm, and the static load at the bottom lining of the combustion chamber is up to 4~5kg/cm. The pressure the furnace roof arch foot bricks bear is 02~20kg/cm2. Under the load of mechanical equipment and continuous high temperature, the brickwork will produce shrinkage deformation and industrial cracks, endangering the service life of the hot blast furnace. The structural types of hot air stoves are different, and the damage to the lining is also different. The most easily damaged part of the internal combustion hot blast stove is the partition wall, while the external combustion hot blast stove is the vault and bridge between the two rooms. The root causes of damage mainly include the following three aspects: 1. The effect of thermal stress....
Refractory bricks are mainly divided into clay refractory bricks, dense clay refractory bricks, high alumina poly light bricks, mullite insulation bricks, high alumina bricks, dense high alumina bricks, silica bricks, magnesia bricks, alumina magnesium bricks, high strength sintered refractory bricks, etc. Various refractory bricks have different raw material ratios and different volume densities, so what are their volume densities? The volume density of several common refractory bricks at present: the volume density of clay refractory bricks is generally 0.3-1.5g/㎝³, the volume density of dense clay refractory bricks is generally 2.05~2.30g/㎝³, the volume density of low-pore clay bricks The density is generally 2.15-2.25g/㎝³. The volume density of high-alumina polylight bricks is generally 0.6-1.0g/㎝³. The volume density of mullite insulation bricks is generally 0.8-1g/㎝³. The volume density of dense high alumina bricks is generally 2.3-2.6g/㎝³, the volume density of dense high alumina bricks is 2.5-2.9g/㎝³, the volume density of silica bricks is generally 1.80-1.95g/㎝³, and the volume density of magnesite bricks is average. The volume density of alumina bricks is 2.60-2.70g/㎝³, the volume density of alumina bricks is 2.90-3.0g/㎝³, the volume density of high-strength sintered refractory bricks is 2.0-2.3g/㎝³, and the volume density of silicon carbide bricks is generally 2.3 -2.6g/㎝³, etc....
As everyone knows about high-aluminum refractory bricks, special-shaped high-alumina refractory bricks are high-aluminum refractory bricks with an irregular shape. Their shapes can be said to be different. Such special-shaped high-alumina refractory bricks generally need to be re-opened. Mold, and then make the high-alumina refractory bricks into the shape we want according to the shape of the mold, which can meet the different needs of different high-temperature industrial kilns and facilitate construction. New special-shaped high-alumina refractory bricks generally adopt advanced manufacturing technology and have a new improvement in the ratio of raw materials and manufacturing technology. The new special-shaped high-alumina refractory bricks have higher refractoriness and lower thermal expansion coefficient. As well as better corrosion resistance, it is currently accepted by many high-temperature industrial kiln companies and is slowly becoming popular in the market. New special-shaped high-alumina refractory bricks are widely used in industries such as steel, non-ferrous metals, glass, ceramics, etc. The applications in these industries are mainly concentrated in key parts with special shapes that require fire-resistant properties. Such special-shaped bricks In addition to meeting all the indicators of refractory bricks, refractory bricks are also very convenient in construction. They are equivalent to a prefabricated part, speeding up the...
Acid-resistant refractory brick is a kind of refractory brick that can withstand acid and alkali. Its main component is silica, with a content of about 70%. It has the characteristics of acid and alkali resistance, oxidation resistance, and corrosion resistance, and is widely used in the chemical industry. In the fields of petroleum, and smelting electric lights, the emergence of acid-resistant refractory bricks is to solve some high-temperature kilns where some media are corrosive. Today, I will give you a brief introduction to the materials and characteristics of acid-resistant refractory bricks. Material of acid-resistant refractory bricks The main raw materials of acid-resistant refractory bricks are quartz, feldspar, and clay. They are corrosion-resistant materials made by high-temperature oxidation and decomposition. The main one is silica, which can form a large amount of mullite under high-temperature roasting. This is a substance with excellent acid resistance. Characteristics of acid-resistant refractory bricks 1. Strong acid resistance The silica content in acid-resistant refractory bricks accounts for about 70%. This substance can form a large amount of mullite in high-temperature environments. It has strong acid resistance and can withstand the erosion of acidic media. At the same time, its water absorption rate is very high. It...
The use temperature of refractory bricks should be distinguished according to the material of the refractory bricks. For example, refractory bricks can be divided into five categories according to the different compositions of the refractory bricks: silicon-aluminum series refractory bricks, alkaline series refractory bricks, carbon-containing refractory bricks, Zirconium-containing refractory bricks and insulating refractory bricks have different temperatures depending on the raw materials. High-alumina refractory bricks are used in the high-temperature area of the kiln lining, and the use area is in the 1300-1400°C range. If the temperature exceeds 1400°C, anti-flaking high-alumina refractory bricks or corundum bricks must be used. The high-alumina refractory bricks used in the burner part should be mullite refractory bricks or corundum-mullite refractory bricks, with a service temperature of 1300 to 1600°C. That is, it is resistant to high temperatures, wear-resistant, corrosion-resistant, and flexible. If andalusite or cordierite is added to high alumina bricks, the service temperature of this special refractory brick is between 1350-1500°C. Ordinary clay refractory bricks have good thermal shock and are used for general kiln linings. The operating temperature is around 1250°C. If it is a low-gas clay brick, it can be used in glass kilns and some special kiln linings. The operating...
Non-stick aluminum castable is a refractory castable used in the aluminum smelting industry. It is widely used in the aluminum melting and casting industry. Although the melting point of the aluminum solution is not high, the aluminum solution has high activity and can penetrate molten aluminum. Furnace lining can cause cracks and lining spalling in the aluminum melting furnace, as well as slag and nodules. To avoid such phenomena, non-stick aluminum castables specially used in the aluminum melting and casting industry have come out. Castables, so which non-stick aluminum castables are better? Xinhongji Refractory is a company engaged in the research, development, production, and sales of refractory materials. Since its establishment, the company has insisted on providing customers with high-quality, high-performance refractory materials products. The company has been committed to research and development to serve the refractory industry. Contributing to the development, the refractory materials produced by Xinhongji Refractory have been well received by customers. The non-stick aluminum castables of Xinhongji Refractory have the characteristics of high fire resistance, corrosion resistance, and non-stick aluminum. They can effectively avoid the above problems and can be used in the bottom of the aluminum melting furnace, the lower furnace wall, the slag removal...
There are many types of industrial kilns, generally speaking, they are mainly divided into four types: hot blast furnaces, aluminum melting furnaces, cement kilns, glass kilns, ceramic kilns, coke ovens, fluidized bed incinerators, etc. During the construction process they all need refractory bricks, so what are the high-temperature kiln refractory bricks they use? Let me give you a brief introduction: 1. Refractory materials for glass tank kiln According to the working environment of the glass tank kiln, factors such as chemical erosion, mechanical erosion, temperature fluctuations, and high-temperature effects that cause kiln lining damage should be comprehensively considered. The selection of kiln materials mainly includes the following series: 1.1 Al2O3-SiO2 series: mainly includes clay bricks and silica bricks. 1.2 Al2O3-ZrO2-SiO2 series: mainly includes zircon bricks and fused zirconium corundum bricks. 1.3 ZrO2-SiO2 series; 1.4 MgO-Al2O3, MgO-Cr2O3, MgO-SiO2 series; 1.5 Insulation materials 2. Cement kiln refractory materials The refractory materials used in cement kilns are a variety of materials and should be used in combination. There are mainly the following categories: 2.1 Alkaline refractory materials; the main varieties of alkaline refractory materials are: magnesia chrome bricks, magnesia bricks, spinel bricks, dolomite bricks, etc. Magnesia chromium bricks are divided into ordinary...
High-temperature refractory castable is a kind of charge often used in high-temperature kilns. It can protect the structure of the kiln and improve the efficiency of the kiln. It is mainly used for the lining of high-temperature industrial kilns such as steel, non-ferrous metals, glass, ceramics, etc. As a manufacturer specializing in the production of high-temperature refractory castables, Xinhongji Refractory has been deeply involved in the industry for many years, and its products have won praise from many customers. High-temperature refractory castables should have been used for a long time, and the future development potential is huge, mainly because with the continuous development of the smelting industry, the performance of the kiln will be required to be further improved, which requires high-temperature refractory castables for casting kilns. The continuous development and progress of materials. At the same time, the country’s emphasis on energy conservation and emission reduction is also increasing. As an important material that can improve kiln efficiency, high-temperature refractory castables will have further increasing market demand. The production process and technology of high-temperature refractory materials are the key to ensuring product quality. Xinhongji Refractory has a professional R&D team and production team, and the company currently uses advanced...
Silicon carbide castable is generally a high-grade refractory material with silicon carbide as the main raw material. It has the characteristics of high strength, high wear resistance, and high slag resistance. Its operating temperature can reach about 1700°C and is generally used in high-temperature applications. In addition to being used alone, silicon carbide castables are often made into shaped refractory materials such as silicon carbide bricks for easily worn parts of the kiln. Currently, silicon carbide castables and silicon carbide products are widely used in high-temperature kilns. Works well in high-temperature kilns. Characteristics of silicon carbide castables 1. High intensity: Silicon carbide has very high strength and can maintain very good stability even at temperatures around 1700°C. 2. High wear resistance: Silicon carbide has a very high hardness, with a Mohs hardness of 9.5, second only to diamond. Therefore, silicon carbide castables have very high wear resistance and can withstand continuous erosion in high-temperature kilns. 3. High slag resistance: Since silicon carbide has good acid and alkali resistance, it can effectively resist the erosion of slag and metal oxides. 4. High refractoriness: The refractory temperature of silicon carbide castables can reach about 1700°C, so it is often used in some...
There are many types of high-aluminum castables, including non-stick aluminum castables, corundum castables, high-aluminum refractory cement, etc., but only those with an alumina content of more than 74% are called high-aluminum castables. There are so many types of high-aluminum castables. How do we choose during use? Next, the editor will help you to understand. First of all, we must understand that high-aluminum castables, as a kind of unshaped refractory material, are often used in kiln projects with irregular shapes. Generally, when we choose high-aluminum castables, we should base them on the purpose of the kiln and the type of materials used. Select the location, refractory temperature, whether it is corrosive, thermal shock resistance, etc., and then use it by pouring. When selecting high-aluminum castables, we need to judge what the kiln is used for. We separate each part of the kiln according to the purpose of use because the temperatures generated by different parts of the kiln during the smelting process are also different. Generally speaking, the working temperature of high-aluminum castables is between 1300℃-1400℃. When it exceeds 1400℃, corundum castables must be selected. Then we will judge whether the smelted material is corrosive. If it is acidic or alkaline...
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