FIELD: treatment processes. SUBSTANCE: the process comprises mixing a concentrated sulfide-sulfate solution with hydrochloric acid containing wash water resulting from prewashing the flue gases of electric power stations operating on coal. The sulfur dioxide that evolved is directed to the stage of absorption of limestone or lime with a suspension to obtain gypsum, and the solution containing sodium sulfate and a residual amount of hydrochloric acid is treated with calcium hydroxide and the resulting suspension is directed to the furnace of an electric power station. EFFECT: more efficient treatment process. 2 cl, 1 dwg
