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Characteristics of refractory bricks


Refractory materials for textile industry are made of stone powder and clay, which are burned in a 1300 degree kiln. Refractory bricks are refractory materials with certain shape and size. According to the preparation process: according to the price of metallurgical auxiliary materials, it is divided into fired brick, unburned brick, electric melting brick (fused cast brick) and fire-resistant and heat-insulating brick; According to the shape and size, it can be divided into standard brick, ordinary brick, special brick, etc. It can be used as high-temperature building materials and structural materials for building kilns and various thermal equipment, and can withstand various physicochemical changes and mechanical effects at high temperature. For example, fireclay brick, high alumina brick, silica brick, magnesia brick, etc. Fireclay usually refers to a kind of clay fireclay used in folk furnace. The characteristics and application of clay firebrick are weakly acidic refractory materials. It has good thermal stability and is suitable for hot furnace, various boiler linings, flue and smoke chamber. Product specification form: standard shape, common special-shaped, special-shaped and special-shaped bricks. Silica bricks and clay bricks are used in large quantities at about 1500 ℃ under the upper limit atmospheric pressure. Silica brick is a silica product containing more than 93% SiO2. The raw materials used include silica, waste silica brick, etc. Refractory brick silica brick has strong acid resistance and slag erosion ability, but it is easy to be eroded by alkaline slag. Its load softening temperature is very high, close to its fire resistance. After repeated calcination, its volume does not shrink or even expand slightly, but its thermal shock resistance of refractory abrasive tools is poor. Silica brick is mainly used for thermal equipment such as coke oven, glass furnace and acid steel-making furnace. Clay brick contains 30% ~ 46% alumina. It takes refractory clay as the main raw material, with a fire resistance of 1580 ~ 1770 ℃ and good thermal shock resistance. It belongs to weak acid refractory, has corrosion resistance to acid slag, has a wide range of uses, and has a wide price of iron and Steel Metallurgical Accessories. It is a kind of refractory with the largest production at present. The main crystal phases of neutral refractory high alumina products are mullite and corundum. The content of corundum increases with the increase of alumina content. Corundum products containing more than 95% alumina are a kind of high-quality refractory with wide application. Chrome brick is mainly made of chrome ore, and the main crystalline phase is chromite. It has good corrosion resistance to steel slag, but poor thermal shock resistance. High temperature load metallurgical accessories Metallurgical Accessories Factory | iron and Steel Metallurgical Accessories | Metallurgical Accessories price and deformation temperature are low. The chrome magnesia brick made of chrome ore and magnesia in different proportions has good thermal shock resistance. It is mainly used as the top brick of alkaline open hearth furnace.


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