在净化铜电解废液工艺流程中，控制阴极电势值，使铜砷优先析出，并抑制氢气与砷化氢的析出，以达到净化电解液的目的。控制阴极电势脱铜砷电积法的脱铜电流效率达到８０％以上，电积后液中铜含量小于０．５ｇ／Ｌ，砷含量小于１ｇ／Ｌ，该方法具有节能与环保双重效益。 In the process of purifying the electrolytic solution of copper electrolysis, the cathode potential is controlled so that the copper and arsenic are preferentially precipitated, and the precipitation of hydrogen and arsine is inhibited, so as to purify the electrolyte. The copper removal efficiency of the copper removal arsenic electrowinning method which controls the cathode potential is more than 80%, the copper content in the electrowinning solution is less than 0.5 g / L and the arsenic content is less than 1 g / L. This method has the dual benefits of energy conservation and environmental protection.