Removal of Cadmium and Cyanide Ions from Rinse Water in Plating Lines

摘要

An input of both cadmium and cyanide ions into waste water is practically eliminated by using two reclaim tanks equipped with electrolytic membrane half-cells operating continuously. Cadmium is deposited on the cathode in the first tank and is returned into the plating tank by periodic stripping. The anode in the first tank is behind the cationic membrane which prevents the access of cyanide complex to the anode. Cyanide is destroyed in the second reclaim tank by anodic oxidation in the presence of chloride ions. Cationic membrane separates the cathode in this tank and allows to maintain optimum pH value.