Recovery method of inorganic salt in ammonia desulphurization waste liquid

The invention provides a recovery method of inorganic salt in ammonia desulphurization waste liquid, which belongs to the field of wastewater treatment, and can solve the problems of pollution and resource waste of the ammonia desulphurization waste liquid. The recovery method comprises the following steps of adding sodium carbonate into the ammonium salt desulfurization waste liquid, mixing withthe sodium salt desulfurization waste liquid, converting, and recovering the generated carbon dioxide and ammonia gas in the process, after the conversion is finished, filtering to obtain insoluble waste residues and primary clear liquid, adjusting the pH value of the primary clear liquid to be acidic, and then carrying out oxidation reaction to obtain an oxidation liquid, filtering the oxidationliquid to obtain elemental sulfur and secondary clear liquid, adjusting the pH value of the secondary clear liquid to be alkaline, and then filtering to obtain waste salt slag and tertiary clear liquid, adding barium hydroxide