The production of KP-95 corundum files [1, 2] involves certain laborious and energy-consuming processes in obtaining kaolinized corundum chamotte, including dry pressing the finely milled mixture of alumina and kaolin, replacing the briquet on kil cars, drying it, and firing in a tunnel kiln at 1520-1580~The Semiluksk factory has developed and implemented a method for the production of high-grade tiles for gate valves, which involves replacing the kaolinized corundum chamotte by a more economical material. It is best to use m~lite--corundum chamotte obtained at the Semiluksk factory, using the normal methods.The water absorption of the mullite--eorundum ehamotte is not more than 2%, * A1203 content not less than 85%, Fe203 not more than 0.5%, and SiO 2 9-10%. The main requirement in changing from kaolinized corundum ehamotte (not less than 95% A1203, not more than 0.5% Fe203 and 1.8-2% SiO2) to a material with a lower refractoriness was the preservation, together with the high density, of adequately high-temperature strength and corrosion resistance, which ensure the stable operation of the tiles.It is known that the high-temperature strength and also the resistance to the action of molten slags and metal by aluminosilicate refractories of a granular structure depend on the composition and structure of the * Here and subsequently parts by weight.
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