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<p>Electronic waste (e-waste) is accumulating rapidly worldwide and presenting a significant environmental challenge. Gold is one of the most precious resources in printed circuit boards. Glycine has been used as a primary agent for gold leaching for an extended period. Nevertheless, its application in isolation has not yielded optimal gold leaching rates. In this paper, the optimal experimental conditions for gold leaching were explored. The optimal leaching conditions in the Gly-(NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>3</sub>-Cu(II) leaching systems were: 20&#xa0;g/L glycine, 10&#xa0;g/L (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>3</sub>, 1% S/L, 1&#xa0;mmol/L Cu<sup>2+</sup>, pH 9.5 ± 0.2, and 262.15&#xa0;K. The extraction of Au can reach 89.17% after leaching for 48&#xa0;h. An enhanced glycine leaching system was studied to analyze the leaching mechanism and leaching kinetics of the Gly-(NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>3</sub>-Cu(II) leaching system. The leaching process in the system was synergistically controlled by both diffusion and chemical reactions over 0−48&#xa0;h. Chemical reaction control and internal diffusion effect collaborated, with the former contributing more to the overall mixed control model.</p>

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Enhanced Glycine−Thiosulfate-Based Leaching of Gold from Powdered Waste Printed Circuit Boards

  • 期刊论文

  • 发表日期：

    2025年7月3日

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  • Fulai Hao,
  • Ye Zheng,
  • Yanming Zhang,
  • Shibiao Zhang,
  • Yanbai Shen

摘要

Electronic waste (e-waste) is accumulating rapidly worldwide and presenting a significant environmental challenge. Gold is one of the most precious resources in printed circuit boards. Glycine has been used as a primary agent for gold leaching for an extended period. Nevertheless, its application in isolation has not yielded optimal gold leaching rates. In this paper, the optimal experimental conditions for gold leaching were explored. The optimal leaching conditions in the Gly-(NH4)2S2O3-Cu(II) leaching systems were: 20 g/L glycine, 10 g/L (NH4)2S2O3, 1% S/L, 1 mmol/L Cu2+, pH 9.5 ± 0.2, and 262.15 K. The extraction of Au can reach 89.17% after leaching for 48 h. An enhanced glycine leaching system was studied to analyze the leaching mechanism and leaching kinetics of the Gly-(NH4)2S2O3-Cu(II) leaching system. The leaching process in the system was synergistically controlled by both diffusion and chemical reactions over 0−48 h. Chemical reaction control and internal diffusion effect collaborated, with the former contributing more to the overall mixed control model.