Process for recovery of sulfur dioxide and by-production of moisture absorbent from calcium hydroxide desulfuration residue

The invention belongs to the technical field of chemical industry, and specifically relates to a process for recovery of sulfur dioxide and by-production of a moisture absorbent from calcium hydroxidedesulfuration residue. The process comprises the following steps: step 1, placing desulfuration residue obtained by calcium hydroxide desulfuration into a reaction vessel, then adding a sulfur dioxide releasing agent into the reaction vessel, and carrying out a reaction under stirring at a reaction temperature of 40 to 50 DEG C, wherein the sulfur dioxide releasing agent is hydrochloric acid; andstep 2, conveying SO2 gas generated in the reaction in the step 1 into a SO2 storage tank, after the reaction is completed, allowing the pH value in the reaction vessel to be 7, and discharging residue located at the bottom part of the reaction vessel out of the vessel body of the reaction vessel through a residue discharging pump. By utilization of the process provided by the invention, SO2 canbe recovered by treatment o