2024-04-17 10:36:07
Silicone refractory material. Silica refractory material is a refractory material mainly composed of SiO2, with a mass fraction of SiO2 not less than 93%. It can be either fixed or amorphous. This refractory material has advantages such as high thermal conductivity, high load softening point, and strong resistance to acid slag erosion, but its biggest drawback is low thermal shock stability. Therefore, this refractory material is mainly used as a structural material for coke ovens, glass furnaces, acid steelmaking furnaces, and other thermal equipment.
Aluminum silicate refractory materials. Aluminum silicate refractory material is a refractory material mainly composed of AI2O3 and SiO2. According to the different AI2O3 content in refractory materials, they can be divided into semi silica (mass fraction 15%~30%), clay (mass fraction 30%~48%), and high alumina (mass fraction>48%) refractory materials. This refractory material has advantages such as light weight, thermal stability, and good insulation performance, but its initial deformation temperature is 1400 ℃. Therefore, aluminosilicate refractory materials are generally used as insulation materials in the metallurgical industry and not for working layers.
Magnesium refractory materials. Magnesium refractory materials are refractory materials with periclase as the main crystal phase and MgO mass fraction greater than 80%. Affected by the composition of magnesium raw materials, the main components of magnesium refractory materials are MgO, FeO, Fe2O3, Al2O3, SiO2, CaO, and Cr2O3. The melting point of MgO is as high as 2800 ℃, and the refractory degree of magnesia refractory materials reaches 2000 ℃, therefore magnesia refractory materials have good high-temperature resistance performance. Magnesium refractory materials include magnesium bricks, magnesium olivine refractory materials, magnesium aluminum spinel refractory materials, magnesium chromium refractory materials, and white jade refractory materials. Among them, magnesia chromium refractory material is made of magnesia sand and chromite, with magnesia sand as the main component. Compared with traditional magnesia bricks, magnesia chromium refractory materials have stronger thermal stability and are widely used in non-ferrous smelting furnaces. However, due to the serious harm of hexavalent chromium to the environment and human health, especially to water pollution, strict control of alkaline media and oxygen partial pressure is required in the production and production process.
Dolomite refractory material. Dolomite refractory material is an alkaline refractory material mainly composed of dolomite and MgO and CaO. The mass fraction of CaO is 40%~60%, and the mass fraction of magnesium oxide is 30%~40%. The refractory temperature of dolomite refractory material is above 1780 ℃, and the starting temperature for softening under 0.2MPa load is 1550 ℃. It can be seen that it has good high-temperature stability. Dolomite refractory materials belong to strong alkaline refractory materials, which have strong slag resistance to alkaline slag, but poor slag resistance to acidic slag. Therefore, this refractory material is mainly used for the walls and bottom of open hearth furnaces, as well as the firing zone of rotary kilns.
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