Abstract: In order to reduce pollution and recycle the resources,a method of extracting copper sulfate from waste residue and waste liquor containing copper was explored.Spongy copper was produced from waste residue and waste liquor containing copper,and then copper sulphate pentahydrate crystal was produced after the steps of displacing, oxidizing,acidifying,crystallizing,and recrystallizing.Copper sulfate crystal was produced by the above-mentioned method.This method had advantages,such as simple equipment,easy operation,and high recovery rate of copper.Product quality of copper sulfate is up to chemical reagents grade. 

Key words: waste residue, waste liquor, copper sulfate；extraction