Process for cleanly and efficiently removing arsenic from waste acid and comprehensively utilizing arsenic

The invention relates to a process for cleanly and efficiently removing arsenic from waste acid and comprehensively utilizing arsenic, which comprises the following steps: adding a certain amount of FeS under proper conditions to precipitate arsenic in waste acid in the form of arsenic sulfide; according to the method, the sulfuric acid is comprehensively utilized, no hydrogen sulfide gas is generated in the whole process, the pH value is not adjusted, no wastewater is discharged in the whole production process, no valuable hazardous waste is generated, no waste gas such as hydrogen sulfide is generated, and secondary pollution to the environment is avoided. 本发明涉及一种从污酸中清洁高效去除砷及综合利用的工艺，是在适宜的条件下，加入一定量的FeS，使污酸中的砷以硫化砷的形式沉淀。本发明综合利用其中的硫酸，整个过程不产生硫化氢气体，不调pH值，在整个生产过程中无废水外排，也不产生无价值的危险废物，也没有硫化氢等废气产生，不会造成环境二次污染。