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The characteristics of the mullite brick

 
With mullite as main crystalline phase of high alumina refractory materials. General alumina content between 65% ~ 75%. The mineral composition of mullite, alumina containing low also contain a small amount of glass phase and cristobalite; alumina containing high also contain a small amount of corundum.

Mullite features: high refractoriness, can reach more than 1790 DEG C. Load softening temperature 1600 ~ 1700 degrees to start. Normal temperature pressure strength of 70 ~ 260MPa. Good thermal shock resistance. The sintered mullite and fused mullite brick two. Sintered mullite brick with high bauxite clinker as the main raw material, adding a small amount of clay or raw bauxite as binder, after molding, sintering and made. Fused mullite brick with high bauxite, alumina and refractory clay as raw material, adding charcoal or coke fines as a reducing agent, formed by reduction of electric melting method to manufacture. The crystallization of fused mullite than sintered mullite, thermal shock resistance than sintered products. The uniformity of content on the high temperature performance of alumina and mullite mainly depends on their distribution and glass. Mainly used for hot blast stove of blast furnace and furnace bottom and furnace, glass furnace regenerator, sintering kiln, petroleum cracking dead lining system.