Electrodeposition Of Copper And Cobalt Technology Research By Ion Exchange Membrane Electrolysis

Using industrial filter cloth for the electrolytic experiment indicated that voltage changed little under different H⁺ concentration. It presented the rising trend that the leaching ratio vs. time of copper and cobalt. It existed the highest leaching ratio of copper when the H⁺ concentration was 0.1 mol/L. It indicated that the leaching ratio of copper and cobalt was the highest when the current was 4 A and the electrochemistry leaching time was 8 h according to the experiment of different current and electrochemistry leaching time. Test results show the little impact that the leaching ratio of copper and cobalt under different initial Fe2+ concentration additive solution in cathode.It was useful for the leaching ratio of copper and cobalt by raising the stirring rate and reducing the H⁺ concentration using the ion-exchange membrane in the electrolysis cobalt and copper by single factor experiments. The leaching ratio of copper was the highest when the stirring rate was 500 r/min, H⁺ concentration was 0.8 mol/L, the temperature was 40℃, the current was 2 A and the electrolysis time was 5 h. The ion-exchange membrane would be damaged when the temperature was too high and the acid fog would pollute the environment. The energy consumption and the costs could be raised by raising the current and electrolysis time; it was harmful to the industrial production. The ion activity and the reaction rate could be reduced if the temperature and the current was too low. Meanwhile, it was notable that stirring rate would be affect the current efficiency in anode, when the stirring rate was 500 r/min, the current efficiency was 93.49%.Stirring rate, H⁺ concentration and Cu²⁺ concentration would be experimented because of the ion-exchange membrane's high temperature resistant ability was limited in the cathode single factor experiments. It indicated that the optimized process of the cathode was as follows: stirring rate was 500 r/min, H⁺ concentration was 0.8 mol/L, the temperature was 40℃, the current was 2 A, Cu²⁺ concentration was 60 g/L and the electrolysis time was 5 h. It was found that the significance of factors affecting the current efficiency in the cathode was Cu²⁺ concentration, stirring rate, H⁺ concentration. It indicated that the current efficiency was 98.95% and the energy consumption was 1244 kWh/t in the optimized process of the cathode.It could be confirmed the optimized process by orthogonal experiments after a single factor experiment in the anode and the cathode. It could be chosen the stirring rate, H⁺ concentration and the temperature which had more influence to the experiments. The significance of factors affecting the leaching ratio of copper in the anode was stirring rate, the temperature and the H⁺ concentration. By orthogonal experiments, it was found that the optimized process of the cathode and anode was as follows: stirring rate was 500 r/min, H⁺ concentration was 0.8 mol/L, the temperature was 40℃, the current was 2 A, Cu²⁺ concentration was 60 g/L and the electrolysis time was 5 h.Compared with the industry product, the ion-exchange membrane electrolysis was carried out in the electrolysis cobalt copper in the advantage of lower coats and the higher utilization rate of equipment, raising the efficiency, protecting the environment and reducing the energy consumption. The optimized process of the cathode and the anode current efficiencies are 94.49% and 96.75%. The energy consumption are 1326 kWh/t and 1294 kWh/t.