Why Do Rotary Kilns Choose High Alumina Bricks?

Refractory bricks can be called clay bricks according to the alumina content of less than 55%, which is a neutral refractory material made of bauxite or other materials with high alumina content. High thermal stability, refractory temperature about 1700°C, used for glass melting furnace, cement rotary kiln, steelmaking electric furnace lining. Of course, there are also some high-alumina clay bricks and high-alumina brick products with high load softness, low creep, and low porosity. According to different application requirements, the ratio of materials is very important in production.

High alumina bricks are mainly used for the masonry lining of blast furnaces, hot blast stoves, electric furnace roofs, blast furnaces, reverberatory furnaces, and rotary kilns. In addition, high alumina bricks are also widely used as open hearth furnace heat storage checker bricks, pouring system plugs, nozzle bricks, etc.

High-alumina bricks and clay bricks not only have different alumina content, but also have similar production processes, but the amount of clinker mixed is high, up to 90-95%, and the firing temperature is much higher than that of clay bricks. In practical tests, primary and secondary high alumina bricks are mostly used in tunnel kilns, blast furnaces, furnace roofs, reverberatory furnaces, rotary kiln linings, and other kilns with a temperature of 1500-1600 °C.

The production process of high alumina bricks is similar to that of multi-clinker clay bricks. The difference is that clinker has a higher share in the mix, up to 90-95%. The clinker needs to be graded, graded, screened, and iron removed before crushing, and the firing temperature is relatively high. When high alumina bricks are fired in a tunnel kiln, the temperature is generally 1500~1600°C. Production practice has proved that the high-alumina clinker is strictly selected and graded before crushing and stored in grades, and the selection of earth ore clinker and clay fine grinding can improve product quality.