Application of corundum brick

Corundum refractory refers to the refractory with Al2O3 as the main compostion and corundum(α- Al2O3) as the main crystal phase. Since it can withstand high temperature and has high hardness, good resistance to oxidization, corrosion and eletricity and good air tightness, it finds a wide application.

Natual corundum is rare in the nature and not . It is mainly used to produce abrasive materials for the machinery industry and precious crafts. So far, it has not been reported to be used produce refractory materials. Corundum used in the refractory industry is made from alumina exacted fron the minerals containing Al2O3.
Refractory brick containing more than 90% Al2O3 are called corundum brick, or pure alumina refractory brick. Corundum has high hardness (Mohs hardness 9) and high melting point. Those properties are related to the Al-O bond. Therefore, it is an excellent mateial to produce high temperature refractory bricks and electrical insualtion materials.
Corundum brick has good resistance to acid and basic slags, molten mental and glass. It can work well in both oxidizing atmosphere and reducing atmosphere. The basic raw material for corundum brick is fused or sintered corundum.
Since it has excellent high temeprature properties and suitable to various conditions, it can not only used in the belly of the blast furnace, but also the hot stove of the blast furnace and other furnaces. It can be used at 1500～1700℃ in furnace walls, roofs and checker bricks, gas preheater, linings in direct contact with methane, natural gas and coke oven gas, vaccum and continuous casting devices and the roof and inner lining of glass furnaces.