What is the specific process of the firing process of refractory bricks?

The firing process of refractory bricks is mainly the process of continuous dehydration and decomposition of kaolin to form mullite (3Al2O3·2SiO2) crystals. The SiO2 and Al2O3 in the refractory brick form a eutectic low-melting silicate with impurities during the firing process, which surrounds the mullite crystals. The highest temperature during the firing process is generally controlled at 1350°C to 1380°C. If the firing temperature of low-porosity clay bricks is appropriately increased (1420°C), the shrinkage of the refractory bricks will increase slightly, so that the density of the refractory bricks will increase slightly, and the low porosity can be achieved. reduce.