シリコン粉末を用いたチオ硫酸アンモニム系浸出液からの金回収

―シリコン上への金および銅の置換析出と再溶解―

抄録

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.