Treatment method for chlorosulfonation acid wastewater

The invention discloses a treatment method for chlorosulfonation acid wastewater. The method comprises the following steps that (1) the chlorosulfonation acid wastewater is cooled to 0-15 DEG C and issubjected to cooling crystallization for 1-24 hours, and through filtration, a filter cake and a filtrate are obtained; (2) the pH of the filtrate obtained in the step (1) is adjusted to 1-6, an extraction agent is added for extraction, after the extraction is finished, standing for layering is conducted, and an oil phase and a water phase are obtained, wherein the extraction agent is an amine complexing extraction agent; (3) the pH of the water phase obtained in the step (2) is adjusted to 6-8, an adsorbent is added for adsorption, and after adsorption is finished, filtration is conducted; (4) the filtrate obtained in the step (3) is subjected to evaporative crystallization and dried to obtain mixed salt; (5) the composition of the mixed salt obtained in the step (4) is analyzed, then according to the requiremen