Method for purifying zinc sulfate electrolyte by using metal aluminum powder

The invention relates to a method for purifying zinc sulfate electrolyte by using metal aluminum powder. The method is characterized in that metal aluminum powder is used as a main purifying agent, or a copper-containing or antimony-containing substance is added as an auxiliary purifying agent; firstly, the aluminum powder is activated in an acidic or alkaline solution with a certain pH value; a proper amount of the purifying agent is added into a zinc sulfate solution to be purified with certain acidity and temperature to be fully mixed and subjected to complete reaction in a certain atmosphere, and liquid-solid separation is carried out; and the zinc electrolyte with qualified impurity metal ions and high-grade leaching residues containing valuable metals such as Ni, Co, Cu and Cd are obtained. According to the method, the technology is simple, the metal aluminum powder with the potential more negative than that of a zinc powder (traditional purifying agent) standard electrode is used as the purifying agent