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PHOSPHATE LINKING OF MINERAL THIN-MOLTED INDUSTRIAL WASTE

The article describes various methods of synthesizing heat-resistant binders based on large-tonnage wastes of enterprises. The use of pyrite butts and expanded clay dust, respectively, from the Chapayevsky Chemical Plant and the expanded clay plant of the city of Samara in the compositions of heat-resistant concrete on phosphate binders allowed to increase their residual strength in the zone of critical temperatures (1300-1350 °С). The refractoriness of these phosphate binders turned out to be very low (≈1300 °С), which required the use of such a method of its increase as the introduction of fine high-alumina fillers with high melting points into the composition of the binder. It was revealed and justified that the use of an alumina-chromium petrochemical waste IM-2201 allowed to increase the refractoriness of the heat-resistant composition to 1600 °С. On the basis of the developed alumina-iron-phosphate, zirconyliron- phosphate and alumino-silicophosphate binders, the compositions of heavy concrete with chamotte and high-aluminous aggregates of grades 400 and 500 were selected.