Adjustment method of copper ion concentration of copper removal electrolytic solution

摘要

PURPOSE:To stabilize the feed flow rate of an electrolyte for removing copper and to carry out appropriate copper removing electrolysis by feeding a part of the anolyte prepared from a waste liquid of nickel electrolysis in nickel refining to the stage where the waste electrolyte is electrolytically decomposed to the copper powder. CONSTITUTION:A nickel matte 1 and elemental sulfur 2 are mixed with a copper-contg. nickel chloride soln. 16c, and the mixture is refined and copper- removed to obtain a copper-contg. nickel slurry 13 and a nickel chloride soln. 11. The soln. 11 is treated in a liq. cleaning stage and a nickel electrolyzing stage 5 to obtain electrolytic nickel 9, and the slurry 13 is treated in a chlorine leaching stage 6 and a copper-removing electrolytic stage 7 to obtain copper powder 10. In the operations, an anolyte 15 is prepared from a waste nickel electrolyte 14, an a part of the anolyte is supplied to a copper-removing electrolyte 18 from the chlorine leaching stage 6 to adjust the copper concn. in the electrolyte 18. As a result, the copper concn. in the electrolyte 18 is lowered without adding water, and the electrolyte is supplied at a stabilized feed flow rate.