Corundum mullite bricks are made of imported tabular corundum and high-purity fused corundum as the main raw materials, and the applied ultrafine powder addition technology is mixed, molded, dried, and fired at high temperature in a shuttle kiln. High-quality corundum bricks have the characteristics of high refractoriness, good thermal shock stability, high temperature strength, corrosion resistance, strong slag resistance, small expansion coefficient, low creep, and spalling resistance, and are suitable for use in high-temperature kilns under various atmospheric conditions; Corundum mullite bricks are widely used in high-temperature sintering of zirconia ceramics, fluorescent materials, electronic ceramics, magnetic materials, ceramic powders, gasification furnaces in the petrochemical industry, second-stage conversion furnaces for synthetic ammonia, carbon black reaction furnaces and high-temperature kilns in the glass industry. The physical and chemical properties of corundum mullite bricks are: Al2O3 85%, Fe2O3 045%, the apparent porosity is 19%, the compressive strength at room temperature is greater than 55MPa, the load softening temperature is greater than 1700, and the change (1600, 3h) is 01%, thermal shock resistance (1100 water cooling) is greater than 30 times.
The manufacturing process usually uses synthetic mullite to manufacture corundum mullite bricks, which can be used as aggregate and -Al2O3 powder as powder, and can also be fused or sintered corundum granules as aggregate and synthetic mullite powder as powder. The aggregate and powder are batched according to a certain proportion and particle size gradation, and a special binder is used to feed in a certain order. Fully mixed evenly, with friction brick press or hydraulic brick press machine forming. Lightweight corundum bricks and lightweight corundum mullite bricks have strong resistance to spalling. The bulk density is at 15-1.7g cm3 is mainly used as the lining of high-temperature tunnel kiln and drawer kiln, and the high service temperature can reach 1700, and the bulk density is 13-1.4 g cm3 is used for insulation bricks for high-temperature tunnel kilns and lining bricks for roller kilns and push plate kilns.