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This study investigated the leachingLeaching of gold from discarded cell phone printed circuit boards (PCBs)Printed Circuit Boards (PCBs) using magnesium thiosulfateThiosulfate solution as a safer alternative to cyanide. The objectives included analyzing and pre-concentrating the pulverized PCBs, optimizing leaching efficiency, and electrowinningElectrowinning the extracted gold. The PCBsPrinted Circuit Boards (PCBs) were pulverized and analyzed using energy dispersive spectroscopy (SEM/EDX) to confirm the gold content. Magnetic separation was used to remove ferrous components, followed by treatment with trioxonitrate (V) and hydrogen tetraoxosulfate (VI) acids to eliminate base metalsMetal like copperCopper and zinc. The residue was then leached with the thiosulfate solution with various concentrations of copper (II) sulfate and ammoniaAmmonia added to enhance gold dissolution. The leachate was used for electrowinningElectrowinning, and the gold content was analyzed with SEM/EDX. The result showed maximum gold dissolution of 0.70 ppm. EDX analysis confirmed the presence of gold in the electrowinningElectrowinning deposit. The study concludes that gold can be extracted from electronic wasteElectronic waste using this method, offering a viable alternative for precious metalMetal recoveryMetal recovery and improving electronic waste management.

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The Use of Magnesium Thiosulfate Solution to Leach Gold from Disposed Cell Phones

  • 会议论文

  • 发表日期：

    2025年

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  • T. L. Akpomejero,
  • M. D. Shittu,
  • D. A. Isadare,
  • B. Aremo,
  • K. E. Oluwabunmi

摘要

This study investigated the leachingLeaching of gold from discarded cell phone printed circuit boards (PCBs)Printed Circuit Boards (PCBs) using magnesium thiosulfateThiosulfate solution as a safer alternative to cyanide. The objectives included analyzing and pre-concentrating the pulverized PCBs, optimizing leaching efficiency, and electrowinningElectrowinning the extracted gold. The PCBsPrinted Circuit Boards (PCBs) were pulverized and analyzed using energy dispersive spectroscopy (SEM/EDX) to confirm the gold content. Magnetic separation was used to remove ferrous components, followed by treatment with trioxonitrate (V) and hydrogen tetraoxosulfate (VI) acids to eliminate base metalsMetal like copperCopper and zinc. The residue was then leached with the thiosulfate solution with various concentrations of copper (II) sulfate and ammoniaAmmonia added to enhance gold dissolution. The leachate was used for electrowinningElectrowinning, and the gold content was analyzed with SEM/EDX. The result showed maximum gold dissolution of 0.70 ppm. EDX analysis confirmed the presence of gold in the electrowinningElectrowinning deposit. The study concludes that gold can be extracted from electronic wasteElectronic waste using this method, offering a viable alternative for precious metalMetal recoveryMetal recovery and improving electronic waste management.