high alumina refractory brick, that is, an aluminum silicate refractory material with an alumina content of more than 48%. It is formed and calcined from bauxite or other raw materials with high alumina content. High thermal stability, refractoriness above 1770℃, good slag resistance.
Alumina refractory brick categories:
Usually divided into three categories
Class I: Al2O3 content ≥75%;
Ⅱ and so on: Al2O3 content 60%~75%;
Class III: Al2O3 content 48%~60%;
It can also be classified according to its mineral composition, generally divided into five categories: low mullite (sillimanite), mullite, mullite-corundum, corundum-mullite and corundum.
Alumina refractory brick production:
The molding production methods of high alumina refractory bricks and clay bricks are basically the same. Only some process parameters are different. There are also processes such as crushing → mixing → forming → drying → firing → inspection → packaging. Its compressive stress is better at low temperature but slightly reduced at high temperature, so the stacking in the kiln is less than 1 meter. The production process of high-alumina refractory bricks and multi-clinker clay bricks is similar. Such as I, II and other high alumina refractory bricks are generally 1500 ~ 1600 ℃ when fired in a tunnel kiln. Production practice has proved that high-alumina clinker is strictly selected and graded before crushing, and graded and stored. The co-fine grinding method of bauxite clinker and combined clay can improve the quality of high-alumina refractory bricks.
Alumina refractory brick usage:
High alumina refractory bricks are mainly used for the lining of blast furnaces, hot blast stoves, electric furnace tops, blast furnaces, reverberatory furnaces and rotary kilns. In addition, high alumina refractory bricks are also widely used as open hearth regenerative checker bricks, plugs for pouring systems, nozzle bricks, etc.
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