Abstract:At present, there are three main types of acid and salt separation technology, i.e., resin adsorption method, ion exchange method and membrane separation technology, but there are few reports about its application on nickel anodic electrolyte of hydrometallurgy. The principles and applications of three types of acid and salt separation technologies were summarized, and the acid and salt separation experiment of nickel anodic electrolyte were carried out by resin adsorption, diffusion dialysis, special nanofiltration membrane and electrodialysis combined methods. The results show that the three methods have a certain separation effect on nickel anodic electrolyte, the resin adsorption method is easy to saturate and requires backwashing to regenerate, which may cause volume expansion; Diffusion dialysis method has a recovery rate of 80% above for sulfuric acid and a rejection rate of 90% above for nickel, but the concentration of recovered sulfuric acid is low, which can also cause volume expansion; The combined method of special nanofiltration membrane and electrodialysis has a rejection rate of 90% above for nickel ions, and a removal rate of hydrogen ions of 70% above. At the same time, the concentration of hydrogen ions after concentration can be raised by more than 400%, and the concentration of nickel ions can be raised by 500%, the concentration of various ions in desalination solution is less than 50 mg/L, which can be used as pure water, and this method will not cause system volume expansion, which has industrial application value.