Abstract: Co and Ni are valuable non-ferrous metals, and important strategic raw materials, but resources is lack and shortage, the separation and recovery of Co and Ni become more important. Through the investigation of relative literatures, the technical status at home and abroad is summarized. The current conventional methods are chemical precipitation, extraction and ion-exchange resin. The related research and application are introduced in detail, the other methods are simple introduced. The separation of nickel and cobalt was studied using electrodialysis in the presence of EDTA-2Na. The electrical laws were described. The molar ratio of Ni2 + and exratctant, liquid chamber flow, raw material concentration, current density, the molar ratio of nickel and cobalt on the effect of separation were studied. The results showed that: the molar ratio of Ni2 + and extractant is 1:1, moderate liquid flow in chamber (70L/h), the higher the concentration of raw materials (Ni2 + concentration of 2.0g/L), current density 20.0mA/cm2, the molar ratio of nickel and cobalt is 1.2:1 have good effect on the separation.
Keywords:Cobalt;Nickel;EDTA-2Na;Electrodialysis;Complexation