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What are the characteristics of sunrise refractory mullite bricks?

Date:2019-03-05 16:23 | From:Zhengzhou Sunrise Refractory | Author:admin
High alumina refractory with mullite as the main 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.
 
Features of mullite: high refractoriness, up to 1790 °C. The load softening start temperature is 1600 to 1700 °C. Normal temperature compressive strength is 70 to 260 MPa. 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. Mainly used in hot stove top, blast furnace body and furnace bottom, glass furnace regenerator, ceramic sintering kiln, oil cracking system dead angle lining.
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