A method for exhaust gas purification

The present invention relates to a method for purifying exhaust gas comprising the steps of: Sulfur dioxide is separated from the exhaust gas in at least a first washing stage (c) by means of ammonia or ammonium compounds, the exhaust gas is transferred to a second washing stage (d) and in the second washing stage described in the first washing stage (c) is not deposited sulfur dioxide in at least one scrubber (d) is oxidized to sulfuric acid and separated and at the same time from the first washing stage (d) escaping ammonia is deposited by means of the formed sulfuric acid being formed ammonium sulfate , The derivation of the second washing stage (d) is supplied to the first washing stage (c).