Gold Recovery from Ammonium Thiosulfate Leaching Solution Using Silicon Powder

―Displacement Deposition of Gold and Copper onto Silicon and Redissolution―

Abstract

After gold recovery using silicon powder from an ammonium thiosulfate leaching solution containing copper（II）sulfate（oxidizing agent for gold dissolution）, copper was also recovered. After a certain period of time, redissolution of copper occurred. Then gold was redissolved. The depletion of silicon in the solution during the recovery process leads to redissolution.