Industry Knowledge of Corundum Refractory Brick

Corundum refractory brick is a high-grade refractory material with strong resistance to high temperature, chemical erosion and mechanical wear. It is widely used in various industries such as metallurgy, petroleum, chemical, building materials, and machinery. In this article, we will introduce the classification, technical parameters, and production process of corundum refractory bricks.

According to the different content of alumina, corundum refractory brick can be divided into three types: high aluminum corundum brick (more than 90% Al2O3), medium aluminum corundum brick (75%-90% Al2O3) and low aluminum corundum brick (less than 75% Al2O3). High aluminum corundum bricks are widely used in the metallurgical industry, medium aluminum corundum bricks are mainly used in high temperature kilns, and low aluminum corundum bricks are mainly used in the petrochemical industry.

The technical parameters of corundum refractory bricks mainly include bulk density, compressive strength, bending strength, thermal shock resistance, and thermal conductivity. The bulk density of corundum refractory bricks is usually above 3.2g/cm3. The compressive strength and bending strength are generally above 70 MPa and 13 MPa, respectively. The thermal shock resistance of corundum refractory bricks is better than other refractory materials, with a thermal shock cycle of about 20 times at 1100℃. The thermal conductivity of corundum refractory bricks is low, which can effectively prevent heat loss and reduce energy consumption.

Corundum refractory bricks are made of high-purity alumina powder and high-quality refractory clay or sillimanite as the main raw materials. The production process includes crushing, grinding, mixing, forming, drying, firing and inspection. The firing temperature of corundum refractory bricks is usually above 1750℃, and the firing time is about 60 hours. The sintering process can promote the formation of mullite and corundum, and improve the strength and thermal shock resistance of corundum refractory bricks.

In conclusion, corundum refractory brick is a high-grade refractory material with excellent performance. Its classification, technical parameters and production process are closely related to its application in various industries. The development of corundum refractory bricks will bring great benefits to human production and life.