Sulfur dioxide scrubbing system and method for producing potassium products

The invention relates to a method for producing potassium thiosulfate, potassium sulfite or potassium bisulfite, comprising the following steps: step (1a): providing a potassium hydroxide solution to neutralize an acid-forming component, such as dissolving SO2 or H2S; step (1b): providing a SO2 contact solution containing at least some potassium sulfite or potassium bisulfite or potassium thiosulfate; step (2): providing SO2 gas; step (3): reacting these to absorb SO2 gas and form an intermediate reaction mixture comprising potassium sulfite or potassium bisulfite or a mixture thereof, and optionally recovering said potassium sulfite or potassium bisulfite or a mixture thereof and/or optionally using steps 4 and 5; step (4): adding a sulfur-or sulfide-containing compound containing sulfur having an oxidation state of 0,-2 or between 0 and-2 to the reaction mixture and optionally potassium hydroxide, and reacting the mixture under suitable conditions to form potassium thiosulfate; and step (5): recovering the