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Gold Leaching from Printed Circuit Boards Using a Novel Synergistic Effect of Glycine and Thiosulfate

Kasun Godigamuwa, Naoko Okibe

2023engoldleachingthiosulfateglycinecircuit boards

Abstract

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Printed circuit boards (PCBs) are a secondary source for the extraction of precious metals, such as gold (Au), silver (Ag), platinum (Pt), and palladium (Pd). Thiosulfate and glycine systems have gained significant attention for Au leaching. However, in the thiosulfate system, stability of leached Au tends to decrease with lower thiosulfate concentrations. This study combined a copper–ammonia–thiosulfate system (thiosulfate system) with glycine to leach Au from PCBs, comparing it with a histidine–thiosulfate system. The glycine–thiosulfate system achieved higher Au leaching rates (93.7%) at pH 9.3 and 40 °C, surpassing results from the thiosulfate (47.1%) and glycine (50.7%) systems. Additionally, while Fe leaching was minimal, Ag and Al leaching reached 95.3% and 27.0%, respectively. The dual system maintained Au stability better than the thiosulfate solely. The Leaching process required 60 mM thiosulfate and 0.5 M glycine at 40 °C and pH 9.3. Kinetic studies indicated that Au and Ag leaching followed a diffusion-controlled model, and the initial Au leaching rate in the dual system resembled that of the glycine–cyanide system. This novel approach presents a mild method for hydrometallurgy to extract other precious metals from similar sources.

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Cite This Work

@article{8a12c8c3-0937-40fe-ab76-dc0990761a7f,
  title={Gold Leaching from Printed Circuit Boards Using a Novel Synergistic Effect of Glycine and Thiosulfate},
  author={Kasun Godigamuwa and Naoko Okibe},
  year={2023},
  language={en}
}
TY  - JOUR
TI  - Gold Leaching from Printed Circuit Boards Using a Novel Synergistic Effect of Glycine and Thiosulfate
AU  - Kasun Godigamuwa
AU  - Naoko Okibe
PY  - 2023
LA  - en
ER  -

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