Mullite Brick
Mullite brick is high aluminum refractory material, of which the main crystal phase is mullite, and containing alumina about 65%～75%. In addition to the mullite, it also contains a small amount of glass phase, cristobalite or corundum.
Its high temperature performance mainly depends on the content of the alumina and the distribution of the mullite phase and glass.
Mullite brick can be produced by casting and sintering. And according to the production technologies, it can be classified into sintered mullite brick and fused mullite brick. Sintered mullite brick is made of high purity alumina bauxite clinker, which is the main raw material, plus a small amount of clay or raw bauxite as binder, being produced by molding, and sintering. While the raw materials of the fused mullite brick are bauxite, industrial alumina and refractory clay, and adding charcoal or coke fine as reducing agents. It is manufactured by reduction fused method. The crystal of the fused mullite is bigger than that of the sintered mullite, so the former has better performance in thermal shock resistance than the latter.
Mullite brick is widely used in the metallurgy industry, chemical industry, glass industry, and papermaking industry. In detail, it can be used in the following parts:
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Hot air furnace, heating furnace, and soaking pit;
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Hearth and bottom of the large scale blast furnace;
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Roof of the steelmaking furnace, and electric furnace;
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Lining and furniture of the ceramic kiln;
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Regenerator of the glass furnace, and ling of the cement kiln;
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Torpedo car, heat treating furnace, heating furnace;
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Converter, and cracking furnace, etc.
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