Couplinganodic Dissolution Of Copper Matte And Electrodeposition Of Copper In An Ion-exchange Membrane Electrolysis Reactor

Coupling electrodeposition of copper and anodic dissolution of matte was studied in an ion-exchange membrane electrolytic reactor.The experiments of electrodeposition of copper show that copper electro-deposition can be carried out under a high current density with current efficiency higher than 99% and lower energy consumption than conventional copper electrodeposition. Elevating temperature and reducing Cu²⁺ and H₂SO₄ concentration can reduce the cell voltage and increase current efficiency. Addition of gelatin and thiourea in the catholyte resulted in detail crystal but roughness of copper deposite. Orthogonal experimental results showed that the significant impact of various factors on the cell voltage, current efficiency and energy consumption were consensus. The optimum conditions were: Cu²⁺ concentration of 30 g/L, H₂SO₄ concentration of 140 g/L, current density of 350 A/m², temperature of 43 oC, without additives and stirring.Anodic dissolution of matte showed that adding copper sulfate, reducing the current density, elevating temperature and stirring can reduce the cell voltage and increase current density. elevating temperature was of benifit to dissolution of copper matte. Orthogonal experiments showed that the influence of current density, stirring speed and temperature on the anode potential, cell voltage and anode current efficiency were more significant than other factors. Optimal conditions were: current density of 150 A/m², stirring speed of 200 rpm, temperature of 55 oC, Cu²⁺ concentration of 0.1 mol/L, H₂SO₄ concentration of 1.5 mol/L.Electrodeposition of copper and anodic dissolution of matte simultaneously showed that cell voltage and anode current efficiency were mainly affected by the anodic factors; cathode current efficiency was mainly affected by the cathodic factors. Energy consumption was mainly affected by the anodic and cathodic current density and Cu²⁺concentration. Optimal conditions were: cathode current density of 200-250 A/m², Cu²⁺ and H₂SO₄ concentration in cathodic region of 35-40 g/L and 120-140 g/L respectively; anode current density of 100-150 A/m², Cu²⁺ and H₂SO₄ concentration in anodic region of 0.1-0.3 mol/L and 0.5-1.0 mol/L respectively; stirring speed of 200 rpm. Coupling electrodeposition of copper and anodic dissolution of matte was studied in an ion-exchange membrane electrolytic reactor.The experiments of electrodeposition of copper show that copper electro-deposition can be carried out under a high current density with current efficiency higher than 99% and lower energy consumption than conventional copper electrodeposition. Elevating temperature and reducing Cu²⁺ and H₂SO₄ concentration can reduce the cell voltage and increase current efficiency. Addition of gelatin and thiourea in the catholyte resulted in detail crystal but roughness of copper deposite. Orthogonal experimental results showed that the significant impact of various factors on the cell voltage, current efficiency and energy consumption were consensus. The optimum conditions were: Cu²⁺ concentration of 30 g/L, H₂SO₄ concentration of 140 g/L, current density of 350 A/m2, temperature of 43 oC, without additives and stirring.Anodic dissolution of matte showed that adding copper sulfate, reducing the current density, elevating temperature and stirring can reduce the cell voltage and increase current density. elevating temperature was of benifit to dissolution of copper matte. Orthogonal experiments showed that the influence of current density, stirring speed and temperature on the anode potential, cell voltage and anode current efficiency were more significant than other factors. Optimal conditions were: current density of 150 A/m2, stirring speed of 200 rpm, temperature of 55 oC, Cu²⁺ concentration of 0.1 mol/L, H₂SO₄ concentration of 1.5 mol/L.Electrodeposition of copper and anodic dissolution of matte simultaneously showed that cell voltage and anode current efficiency were mainly affected by the anodic factors; cathode current efficiency was mainly affected by the cathodic factors. Energy consumption was mainly affected by the anodic and cathodic current density and Cu²⁺concentration. Optimal conditions were: cathode current density of 200-250 A/m2, Cu²⁺ and H₂SO₄ concentration in cathodic region of 35-40 g/L and 120-140 g/L respectively; anode current density of 100-150 A/m2, Cu²⁺ and H₂SO₄ concentration in anodic region of 0.1-0.3 mol/L and 0.5-1.0 mol/L respectively; stirring speed of 200 rpm.