Electrolysis Recovery of Valuable Metal Using Ion Exchange Membrane

Abstract

Noble metals in waste liquid discharged from metal plating process are landfilled as sludge formed by neutralization precipitation. In order to utilize the resource, we have attempted to recover nickel from waste liquid by electrolysis. The efficiency of nickel recovery impair with decreasing of pH in electrolysis due to the use of insoluble anode. To keep pH of electrolyte, we introduced an anion exchange membrane into recovering device. As a result, we confirmed to recover 98% of nickel from waste liquid.