China Nonferrous Metallurgy

Non-ferrous smelting enterprises produce a large amount of arsenic-containing wastewater. Arsenic has a special affinity for the mercapto group of enzyme proteins in the human body, especially with the mercapto group of pyruvate oxidase, causing harm to human body. Copper arsenite can be used as agricultural pesticides, herbicides, antifungals and rodenticides, and can be used as poisons in bullet baits and a raw material for preparation of arsenic trioxide. The copper sulfate precipitation method was used to remove arsenic from wastewater, and the effects of copper sulfate dosage, reaction temperature, reaction time, stirring speed and solution pH on removal of arsenic from arsenic-containing wastewater were investigated. The results show that the dosage of copper sulfate is n（Cu)/n（As)=2.0, the stirring speed is 50r/min, the reaction is carried out at 20℃ for 2.0h, the pH of the solution is adjusted to 8.0, and the yield of copper arsenite is 97.23%, to provide important data support for treatment of arsenic-containing wastewater in non-ferrous smelting enterprises.