FIELD: chemical technology. SUBSTANCE: energy coal ash is processed to alumina and gypsum by calcination with calcium fluoride. Calcined ash is treated with sulfuric acid at 180-200 C following by caking at 200-300 C under vacuum value 0,2-0,3 kgf/cm2 with gases exhaust at 120-150 C and their absorption with ammonia solution and cake leaching. EFFECT: improved method of coal processing. 4 tbl
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