Study on technology of making high-purity zinc sulfuric solution from zinc dust

The leaching of zinc dust using sulfuric acid as lixivium was studied.The orthogonal experiment and the mono-factor experiment was made to investigate the influence of concentration of sulfuric acid,liquid-to-solid ratio,leaching time,leaching temperature on zinc,iron acid-leaching performance of the zinc dust.The method of iron-removal using the goethite process and oxidation-hydrolysis process,the oxidizing method of iron-removal using ammonium persulphate and the purification by adding zinc power was adopted.The optimal processing conditions of leaching as fellows:the concentration of sulfuric acid is 1.0mol/L,liquid-to-solid ration is 7:1, leaching temperature is 60℃,leaching time is 2.5h.Under this condition,the leaching percent of zinc is 97%.The result gets high-purity zinc sulfuric solution by purifying.Test resaults shows that the extraction of zinc from zinc dust has good effect.