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Both corundum castables and corundum mullite castables are a type of refractory castables, both of which have high-temperature resistance and corrosion resistance, and are often used in the lining construction of high-temperature industrial kilns. Although they all contain corundum, there are great differences in the refractory temperature and physical and chemical indicators used. First of all, let’s first understand the “corundum” component contained in the two. Corundum is an oxide mineral whose main component is Al2O3. It has the characteristics of high hardness, high melting point, and corrosion resistance, so it is widely used in metallurgy and machinery. , chemical industry, electronics, aviation and national defense, and other industrial fields. As a refractory material, it has the characteristics of high-temperature resistance, corrosion resistance, and high strength, and is widely used in the lining of high-temperature kilns. The second is the “mullite” component in the corundum mullite castable. Mullite is a mineral formed by aluminosilicate at high temperatures. Mullite will be formed when aluminosilicate is artificially heated. Generally, mullite is Artificially synthesized, it has the characteristics of high melting point, creep resistance, low expansion coefficient, thermal shock resistance, and corrosion resistance. It is a high-quality refractory material, so it is widely...
Mullite insulation brick refers to a high-alumina refractory material with mullite as the main crystal phase. Mullite bricks have high refractoriness, which can reach above 1790°C. They are mainly used in the manufacture of high-temperature stoves, heaters, and industrial Insulation layers of kilns. It has excellent high-temperature resistance, high-temperature stability, and thermal conductivity at high temperatures, so it is often used in the core parts of high-temperature furnaces, such as furnaces, nozzles, high-temperature air, fuel conduits, etc. The advantages of mullite insulation bricks lie in their high-temperature stability, wear resistance, and corrosion resistance. It can still maintain its original structure and performance at high temperatures without deformation, cracking, or shrinkage, and it can also resist the erosion of various chemical substances. In addition, mullite insulation bricks also have low thermal conductivity, which can effectively reduce heat energy loss and improve the energy efficiency of the kiln. In practical applications, mullite insulation bricks are widely used in various high-temperature furnaces, glass manufacturing, steel smelting, chemical industry, and other fields. It can not only ensure the high efficiency and stability of the production process but also improve the quality and output of products. In addition, mullite insulation bricks are also widely used...
The basis for choosing refractory bricks mainly includes the following aspects: Thermal properties: Thermal properties are one of the important properties of refractory bricks, including thermal expansion coefficient, thermal conductivity, specific heat capacity, thermal shock resistance, etc. Different refractory bricks show different thermal properties at different temperatures, so it is necessary to choose the appropriate refractory brick according to the specific use conditions. Chemical stability: Refractory bricks need to withstand high temperatures and various chemical corrosion, so chemical stability is an important factor in choosing refractory bricks. Different chemical environments have different corrosive effects on refractory bricks. For example, alkaline environments have a greater corrosive effect on silicate ceramics, while acidic environments have a greater corrosive effect on silicon carbide. Therefore, it is necessary to select the appropriate refractory brick according to the specific use environment. Physical and mechanical properties: The physical and mechanical properties include the compressive strength, flexural strength, and wear resistance of refractory bricks. Different physical and mechanical properties directly affect the service life and use effect of refractory bricks, so it is necessary to choose refractory bricks with better physical and mechanical properties. Cost and use effect: The cost of refractory bricks is also one of...
Mullite castable is a refractory castable made of porous mullite aggregate as raw material, plus fine powder and additives. The critical particle size of mullite aggregate is 12mm; the long-term use temperature is 1350 degrees. The mullite castable has a high service temperature and can be used as a working lining in direct contact with the flame to achieve high temperature and energy saving. Among them, mullite is a very strong stone, which makes it an excellent castable. Due to its strength and robustness, mullite castables can be used in the construction of various structures such as high-rise buildings, bridges, roads, and embankments. It can also be used to make various building materials such as bricks, cement, and plasterboard. Secondly, mullite also has good fire resistance. These properties make it an excellent material for manufacturing goods in high-temperature environments, such as high-temperature furnaces and stoves. It can withstand high pressure and heavy pressure at high temperatures, making it an ideal material for making metals and glass. The corrosion resistance of mullite is also very high. This makes it an ideal material for use in the manufacture of chemical storage tanks and piping. It can withstand the erosion of various strong...
The lining of the intermediate frequency furnace is usually bundled with refractory materials of various particle sizes (commonly used refractory materials mainly include magnesium, quartz, aluminum, and composite materials). Cracking and spalling of intermediate frequency furnace linings are common problems, which can lead to premature failure of the furnace lining and shorten its service life. What is the reason for the falling off of the intermediate frequency furnace lining? The initial damage of the intermediate frequency lining is due to the corrosion of the front end caused by the dissolution of the refractory sintered layer in the slag, and the appearance of cracks caused by temperature cycles. Another factor that causes cracks to propagate throughout the liner is the stress created by heating to too high a temperature resulting in a difference in the coefficient of expansion between the “three bands”. The transverse cracks in the lining of the intermediate frequency furnace are due to the lack of degassing forks between the front and rear materials when the lining is knotted, resulting in delamination between the materials; secondly, the cooling speed of the backing of the upper mouth of the furnace is too fast. When the temperature difference with the...
The biomass boiler should choose the boiler lining according to the combustion materials. If it is biomass particles, the temperature in the furnace can reach about 1200 degrees, and coking will occur. The working conditions are very bad. High-quality refractory materials should be selected. If the material is logs, the impact is not significant. The selection of refractory materials for biomass boilers needs to consider the following aspects: High-temperature resistance performance: The working temperature of the biomass boiler is relatively high, so it is necessary to choose refractory materials that can withstand high temperatures, and generally require the ability to withstand high temperatures above 1000°C. Abrasion resistance: When a biomass boiler burns biomass, it may contain particulate matter, which will cause wear to the refractory material. Therefore, it is necessary to choose refractory materials with better wear resistance. Corrosion resistance: The gas produced by the combustion of biomass boilers may contain some corrosive chemicals, which will cause corrosion to refractory materials. Therefore, it is necessary to choose refractory materials with better corrosion resistance. Stability performance: choose a refractory material with better stability performance to ensure that its long-term use will not cause problems due to its own chemical changes. Cost...
Low creep and spalling resistance are two important performance indicators of refractory bricks, and their meanings are as follows: Low Creep: Creep refers to the continuous deformation of a material under stress for a long time at high temperatures. In high-temperature environments, refractory bricks are subject to thermal stress, and creep is the continuous deformation of the brick material under this stress. Low creep means that refractory bricks can maintain small deformation when used at high temperatures for a long time, reducing the adverse impact on the kiln structure. Anti-spalling (Anti-spalling): Anti-spalling refers to the ability of refractory bricks to resist spalling or cracking caused by thermal shock at high temperatures. Inside the kiln, due to high temperatures and thermal cycles, refractory bricks are subject to stress caused by thermal expansion and contraction and are prone to peeling or chipping. Refractory bricks with good peeling resistance can effectively resist this kind of peeling and chipping, and maintain the integrity and stability of the inner lining. Low creep and spalling resistance are important performance indicators of refractory bricks when they are used for a long time in high-temperature environments. Good refractory bricks should have low creep and good spalling resistance to...
Rotary kilns are widely used in building materials, metallurgy, chemical industry, and environmental protection industries, mainly for mechanical, physical, or chemical treatment of solid materials. Among them, the rotary kiln is widely used in the cement industry, and usually processes cement, lime, and other materials commonly used in construction, as well as materials that are difficult to calcinate. The rotary kiln mainly includes the kiln head and the kiln tail. The use occasions of the kiln head and the kiln tail are different, and we are also different when choosing refractory castables. So today Xinhongji Refractory will briefly analyze the castables for the rotary kiln head. The kiln head of the rotary kiln is mainly used for discharging materials. The high temperature generated by the calcination of the materials inside the equipment can be cooled by the kiln head cooler, and then transported to the clinker bin for storage or transportation. There are many types of rotary kilns, and the temperature is different when calcining different materials. Among them, the temperature of our common cement rotary kiln can reach about 1600°C during calcination; the temperature of the ceramsite sand rotary kiln can reach 1050°C during operation; the temperature of the...
Chrome corundum brick is a commonly used high-temperature refractory material, but it is prone to thermal shock cracks at high temperatures, which affects its service life. The following are several ways to improve the thermal shock stability of chrome corundum bricks: Optimizing the formula: adjusting the raw material ratio and particle size distribution of chrome corundum bricks, selecting suitable binders and additives, and optimizing the formula can improve the structure and performance of chrome corundum bricks and improve their thermal shock stability. Adding micro powder: Adding a certain proportion of micro powder to chrome corundum bricks, such as microcrystalline oxide, micron silicon powder, etc., can change the microstructure and porosity of chrome corundum bricks and increase their thermal shock stability. Adopt permeable structure: Apply permeable structure to the production of chrome corundum bricks, that is, spray or impregnate certain materials on the surface of chrome corundum bricks to penetrate into the inside of the brick body, thereby forming a certain permeable layer and increasing its thermal shock stability sex. Composite structure: In the production of chrome corundum bricks, a composite structure is adopted, that is, the surface of chrome corundum bricks is covered with a layer of other high-temperature refractory...
Refractory bricks used in cement kilns include fire clay bricks, high alumina bricks, magnesia alumina spinel bricks, magnesia iron spinel bricks, magnesia chrome bricks, silica mullite bricks, etc. Refractory bricks have certain refractoriness and can withstand corrosion and impact in high-temperature environments. Ordinary refractory bricks are mainly used to build the kiln wall, kiln roof, kiln bottom, kiln head, and other parts, which can effectively protect the cement kiln from the corrosion and erosion of high-temperature flue gas and raw materials. Magnesia-aluminum spinel refractory brick: made of alumina, bauxite, spinel, and other materials, it has a high heat resistance and resistance to cold and heat cycles. High alumina spinel refractory bricks are used in the feeding port, cooling zone, kiln shell, and other parts of the cement kiln. Due to the impact and corrosion of high temperatures, the stable operation of the equipment is guaranteed. According to different use parts and working environments, cement kiln refractory bricks should be built with refractory bricks of different materials and properties. Quality requirements for refractory bricks and other lining materials used in cement kilns The refractory bricks and other lining materials built in the cement kiln shell must meet the following requirements: (1)...
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