Experimental study on extraction and purification process of low grade copper sulfate produced by a copper smel-ting plant. A mixed extraction system single factor extraction experiment was conducted,and under the optimal process con-ditions,the extraction rates of impurity elements in the crude copper sulfate solution reached Fe 99.99％,Zn 99.99％,Al 90.60％,Ca 54.74％,As 97.91％,Bi 99.95％,and Si 3.51％;After recrystallization,the residual solution can further re-duce Ni content and produce copper sulfate products that meet the"Industrial Copper Sulfate"( HG/T 5215-2017) premi-um standard.
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