An Electromembrane Process for Cadmium Recovery from Dilute Cadmium Electroplating Dragout Solutions

Resumo

Electromembrane processes have been used to reduce 100–1000 times the carryover of cadmium ions from cadmium electroplating baths into electroplating wastewater. Laboratory experiments and industrial practice have shown that the efficiency of the process depends on the type of cadmium plating electrolyte used: it is maximum for cyanide electrolytes (cadmium recovery efficiency is 99.9%) and minimum for sulfuric acid electrolytes free of ammonium ions (recovery efficiency is 99%). The technology and equipment developed are used in a number of industrial plants.