Silicon Carbide Mullite Bricks for Cement Kilns

Silicon carbide mullite bricks are fired bricks composed of mullite (3Al2O3.2SiO2) and silicon carbide (SiC) as the main minerals. Silica-mullite brick has the high-temperature resistance of mullite and the wear resistance, corrosion resistance, and good thermal conductivity of silicon carbide.

Physical and chemical indicators of silica mullite refractory brick

Product		AZM-1650	AZM-1680
Chemical composition	SiC+SiO2	≥30	≥32
	Al2O3	≥65	≥65
Bulk Density(g/cm3)		≥2.65	≥2.70
Apparent Porosity (%)		≤19	≤19
Cold Crushing Strength(Mpa)		≥90	≥100
Refractoriness Under Load		≥1650	≥1680
Thermal Shock Resistance		≥15	≥20

The main uses of silicon carbide mullite brick

It is suitable for the transition zone, preheating zone, tertiary air duct, five-stage preheater, and lime kiln discharge chute of cement rotary kiln.

Comparison of silicon mullite brick and magnesia-alumina spinel bricks

Silica mullite refractory bricks are suitable for the transition zone of cement kilns as well as magnesia-alumina spinel bricks. Compared with magnesia-alumina spinel bricks, they have a higher cost performance. Compared with magnesia-alumina spinel bricks, silicon mullite bricks have the advantages of low thermal conductivity, good thermal shock stability, and high cost performance.

Compared with silicon carbide mullite bricks, magnesia-alumina spinel bricks have the advantage of stronger corrosion resistance and the disadvantage of high thermal conductivity. In the system of waste cement rotary kiln processing, magnesia-alumina spinel bricks have better alkali-sulfur corrosion resistance. , so in large-scale rotary kilns, magnesium-alumina spinel bricks are still mostly used for masonry due to safety factors.