Experimental Study on Removal of Arsenic from Sulfuric-Acid Residue of High-Arsenic

Abstract

The experimental study on removal of arsenic from sulfuric-acid residue of high-arsenic was conducted in this paper. Reduction roasting–magnetic separation and sulfuric acid leaching were discussed, and the results showed that the harmful impurity arsenic can't be effectively removed by the reduction roasting-magnetic separation process from sulfuric-acid residue. The content of arsenic would be enriched with the growth of magnetic iron grade, while the effect of the arsenic removal was obvious for sulfuric acid leaching. The leach residue, in which the content of arsenic was only 0.24% with 92.29% of arsenic leaching rate was obtained from the raw ore with 2.78% of arsenic by the sulfuric acid leaching process. And the iron grade of sulfuric-acid residue reached 61.88% while content of non-ferrous metal was very Low, which can be used as a raw material of iron-smelting. This study provided a certain amount of technical support for the similar high arsenic sulfuric-acid residue recycling.