Talking about the function of high alumina refractory brick
High alumina refractory brick is an aluminum silicate refractory with alumina content of more than 48%. It is formed by molding and calcining bauxite or other materials with high alumina content. High thermal stability, fire resistance above 1770 ℃. Good slag resistance. High alumina refractory bricks are mainly used for lining blast furnace, hot blast furnace, electric furnace top, blast furnace, reflection furnace and rotary kiln.
In addition, high alumina bricks are also widely used as open hearth regenerative lattice bricks, plugs for gating systems, nozzle bricks, etc. However, the price of high alumina brick is higher than that of clay brick, so high alumina brick is not used locally where clay brick can meet the requirements. The molding production methods of high alumina refractory brick and clay brick are basically the same.
Only some process parameters are different. There are also processes such as crushing → mixing → molding → drying → firing → inspection → packaging. The compressive stress is better at low temperature, but it decreases slightly at high temperature, so the accumulation in the kiln is less than 1m. The production process of high alumina refractory brick is similar to that of multi clinker clay brick. The difference is that the proportion of clinker is high and can be as high as.
Clinker shall be sorted and screened before crushing to remove iron. The firing temperature is high, such as 1500 ~ 1600 ℃ when high alumina refractory bricks such as I and II are fired in tunnel kiln. The production practice has proved that the product quality can be improved by strictly selecting, grading and storing high alumina clinker before crushing, and selecting the joint fine grinding method of bauxite clinker and combined clay.