Classification of mullite insulation brick:

 

Mullite insulation bricks are mainly divided into light and heavy mullite bricks according to the density, and are divided into: 1350 mullite insulation bricks, 1450 mullite insulation bricks, 1550 mullite bricks, etc. .

Mullite insulation brick performance and application: high fire resistance, up to 1790 ℃. Load softening start temperature is 1600 ~ 1700 ℃. The compressive strength at room temperature is 70 ～ 260MPa. Good thermal shock resistance. There are two types of sintered mullite bricks and fused mullite bricks. The sintered mullite brick is made of high alumina bauxite clinker, and a small amount of clay or raw alumina is added as a binder, and then formed and fired. The fused mullite brick is made of high alumina, industrial alumina and refractory clay, and is added with charcoal or coke fine particles as a reducing agent. After molding, it is manufactured by reduction electrofusion. The fused mullite crystals are larger than the sintered mullite and have better thermal shock resistance than the sintered products.

 

The high temperature performance of mullite insulation bricks mainly depends on the content of alumina and the uniformity of mullite phase and glass distribution. Mainly used in hot blast stove top, blast furnace body and bottom, glass melting furnace heat storage chamber, ceramic sintering kiln, dead angle lining of petroleum cracking system, etc.