Refractory Material for Coke Oven

Clay bricks refer to clay products made of aluminum silicate materials with an Al2O3 content of 30% to 40%. Clay bricks are made of 50% soft clay and 50% hard clay clinker, and are mixed according to certain particle size requirements. After molding and drying, they are fired at a high temperature of 1300 to 1400°C. Clay bricks are weakly acidic refractory products that can resist the erosion of acidic slag and acidic gases, but have a slightly poor resistance to alkaline substances. Clay bricks have good thermal properties and are resistant to rapid cooling and heating. Because clay bricks have a low load softening temperature and shrink at high temperatures, their thermal conductivity is 15% to 20% lower than that of silica bricks, and their mechanical strength is also worse than that of silica bricks. Therefore, clay bricks can only be used in secondary parts of coke ovens, such as regenerator sealing walls, small flue lining bricks and regenerator lattice bricks, furnace door lining bricks, furnace roofs, and riser lining bricks.

High alumina bricks are refractory products made of aluminum silicate or alumina with an Al2O3 content greater than 48%, collectively known as high alumina refractory products. The refractoriness and load softening temperature of high alumina bricks are higher than those of clay bricks, and the slag corrosion resistance (especially to acidic slag) is better, and these properties increase with the increase of Al2O3 content, but the thermal stability is not as good as clay bricks. High alumina bricks have high density, low porosity, high mechanical strength and wear resistance. The furnace head of the coke oven combustion chamber and the furnace head of the carbonization chamber are built with high alumina bricks, and the effect is better; but it is not suitable for the wall of the carbonization chamber, because high alumina bricks are prone to curling and warping at high temperatures.