Last issue we introduced characteristics of mullite insulation bricks. This issue we will continue to introduce classification of mullite insulation bricks.
Classification of mullite insulation bricks.
Mullite insulation bricks are classified into light and heavy mullite bricks according to its density. And are classified into: 1350 mullite insulation bricks, 1450 mullite insulation bricks, 1550 mullite insulatin bricks according to the working temperature. .
Characteristics and application of mullite insulation bricks: High refractoriness which is above 1790 ℃. Softening temperature under load: 1600 ～ 1700 ℃. Compressive strength under normal temperature is 70 ～ 260MPa. Good thermal shock resistance.
There are sintered mullite bricks and fused mullite bricks. Sintered mullite bricks are made of high-alumina bauxite clinker, with a small amount of clay or raw bauxite as a binding agent, and are made by molding and firing. The fused mullite bricks are made of high alumina, industrial alumina and refractory clay, with fine particles of charcoal or coke as reducing agents, and are manufactured by reducing electric melting after molding. The crystal of fused mullite is larger than that of sintered mullite, and its thermal shock resistance is better than that of sintered products. Their high temperature performance mainly depends on the content of alumina and the uniformity of the distribution of mullite phase and glass phase.
They are mainly used for hot blast furnace roof, blast furnace body and bottom, glass melting furnace regenerator, ceramic sintering kiln, oil cracking system furnace inner corner lining, etc
