METHOD TO INCREASE OPERATIONAL CHARACTERISTICS OF SILICA-ALUMINA REFRACTORY MATERIAL Russian patent published in 2013 - IPC C04B41/85 C04B35/18 

FIELD: construction.

SUBSTANCE: invention relates to the method of increasing physical and mechanical indices of silica-alumina refractory materials with high content of Al₂O₃. The stated objective is achieved by impregnation of separate refractory materials with an aqueous solution of acid aluminophosphate of Al(H₂PO₄)₃ type with density of 1.52 g/cm³ under normal conditions for 6-8 hours with subsequent thermal treatment at 250-350°C for 2 hours. The impregnation composition is produced by mixing of sludge from alkaline etching of aluminium in the amount of 35-45 wt % with orthophosphoric acid of 60% concentration (balance).

EFFECT: considerable increase of physical and thermal indices of a silica-alumina refractory material, namely, chamotte of ShA type, which will positively affect durability of thermal device linings.

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