Mullite is divided into different according to the density of the heavy and light Mullite, mainly divided according to use at different temperatures: 1350 Mullite, 1450 mullite brick, mullite brick, etc. 1550
Refractoriness higher, up to 1790 ℃ or more. Load softening starting temperature of 1600 ~ 1700 ℃. Cold crushing strength 70 ~ 260MPa. Good thermal shock resistance. Sintered mullite brick and fused mullite brick two kinds. Sintered Mullite high bauxite as the main raw material, add a small amount of clay or raw alumina as binder, by molding, firing and made. Fused Mullite high bauxite, alumina and refractory clay industry as raw materials and fine charcoal or coke as a reducing agent, to produce fused after forming method using the reduction. Fused mullite crystals than the sintering mullite large, thermal shock resistance than sintered products. Their high temperature performance depends on the content of alumina and mullite phase and the uniformity of the glass. Mainly used for stove top, blast furnace body and bottom, glass melting furnace regenerators, ceramic sintering furnace, lining and other petroleum cracking system dead.