Abstract:The effects of temperature, time, Cu2+ and Sb3+ on cobalt removal from simulated neutral leaching solution after removal of copper and cadmium by zinc powder replacement were studied in the range of 50~90 ℃. The open circuit potential and impedance of zinc electrode were measured in the above solution. The experimental results show that the removal of cobalt ions by metal zinc replacement is inhibited due to the high precipitation over potential, and the addition of Cu2+ and Sb3+ has catalytic effect on the replacement of Co2+. Cu2+ has fast catalytic speed, but unstable cobalt removal effect. The cobalt removal speed is still slow during Sb3+ catalysis, but the replaced cobalt can exist stably. When Cu2+ and Sb3+ are used as catalysts, the removal rate of cobalt is faster and the effect is more stable. The results of electrochemical open-circuit potential test show that Cu2+ can catalyze H+ precipitation on metal zinc, while Sb3+ can delay H+ precipitation. It is found that Sb3+ has a slight decreasing effect on the impedance of Co2+ removal by zinc replacement at 50 ℃, while Cu2+ has a significant decreasing effect on the impedance of Co2+ removal by zinc replacement. When Cu2+ and Sb3+ are used together, the impedance of Co2+ removal by zinc substitution drops significantly.