FIELD: methods of removal of sulfur dioxide from flue gases. SUBSTANCE: flue gas is treated by absorbing fluid in flushing zone of gas cleaner in countercurrent. Absorbing fluid consists of mixture of ammonia liquid containing ammonium sulfite of fluid which is discharged from gas cleaner below flushing zone and is returned without intermediate treatment and ammonium sulfate solution which is returned from oxidizer. Ratio between ammonium sulfite and ammonium sulfate ranges from 15:1 and 3:1. EFFECT: enhanced efficiency of separation of sulfur dioxide at lesser formation aerosol. 9 cl, 1 dwg
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