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Using of HCAC as a clearing material of hydrometallurgical productionпїЅs effluent. Hydrocarbonoaluminate of calcium is synthesized in the system CaO-Al2O3-Na2O-CO2. Such system is characteristic for high silicon content aluminum raw on alumina processing plants by sintering method as desilication reagent. By this method aluminatesпїЅ solution decomposition conducts by carbonization receiving of aluminium hydrate and sodium liquor. HCAC has developed surface, neutral pH, which let us using it as clearing material ...