Introduction and product characteristics of Tianyang refractory mullite brick

The mullite brick is a high alumina refractory material mainly composed of mullite (3Al2O3.2SiO2). Generally, the alumina content is between 65 and 75. In addition to mullite, the mineral composition contains a small amount of glass phase and cristobalite mullite brick is a high alumina refractory material with mullite (3Al2O3.2SiO2) as the main crystal phase. Generally, the alumina content is between 65 and 75. In addition to mullite, the mineral composition contains a small amount of glass phase and cristobalite, and a higher amount of alumina also contains a small amount of corundum.

The mullite brick has a high degree of refractoriness and can reach above 1790 °C. The load softening start temperature is 1600 to 1700 °C. Normal temperature withstand strength of 70 ~ 260MPa. Good thermal shock resistance. There are two kinds of sintered mullite bricks and electric fused mullite bricks. The sintered mullite brick is made of high alumina bauxite clinker as a main raw material, and a small amount of clay or raw bauxite is added as a binder, which is formed by molding and firing. The electric melting 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, and is formed by reduction electrofusion after molding. The crystal of fused mullite is larger than sintered mullite, and the thermal shock resistance is better than that of sintered products. Their high temperature performance depends mainly on the alumina content and the uniformity of the mullite phase and glass distribution.

 

Our mullite insulation bricks are mainly used in hot air furnace tops, blast furnace shafts and furnace bottoms, glass melting furnace regenerators, ceramic sintering kiln, and oil cracking system dead angle lining.