Method for recovering copper from cupric chloride etching waste liquid

摘要

PURPOSE:To remove a halogen radical from copper halide solution containing free halogen and a complex of halogen and copper. CONSTITUTION:An anion-exchange membrane 2 is arranged inside a dialysis tank 1 so that the dialysis tank 1 may be divided into a copper halide solution tank 11 and a solvent tank 12 by it. Copper halide solution containing free halogen and a complex of halogen and copper is fed to the copper halide solution tank 11 and simultaneously to the solvent tank 12 is fed, for example, ion exchanged water. Since the free halogen existing in the copper halide solution is passed through the anion-exchange membrane 2 to transfer it to the ion exchanged water side, causing the free halogen on the copper solution side to be decreased, the halogen in the complex is eliminated as the free halogen in order to maintain the equilibrium and the eliminated halogen is similarly transferred to the ion exchanged water side afterwards. Therefore, the halogen radical existing as a free halogen or the complex is removed.