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<p>Growing environmental concerns have prompted the search for sustainable alternatives to cyanidation, the most common but toxic method for silver extraction. Sodium thiosulfate is a less hazardous lixiviant capable of dissolving silver efficiently, while glycine, a biodegradable amino acid, enhances leaching by forming stable metal complexes. This study evaluated the performance of sodium thiosulfate with glycine for acanthite (Ag<sub>2</sub>S) leaching, comparing its efficiency with conventional cyanidation. Experiments included cyanidation tests and thiosulfate systems containing 0.063&#xa0;M Na₂S₂O₃, 0.02&#xa0;M CuSO₄·5H₂O, and 0.026&#xa0;M ethylenediaminetetraacetic acid (EDTA). In the modified system, 0.13&#xa0;M glycine was added. The thiosulfate–glycine system achieved a maximum silver recovery of 54% within two hours, significantly higher than the 32% obtained without glycine. These findings demonstrate that thiosulfate–glycine leaching represents a safer and more sustainable alternative to cyanidation for large-scale silver recovery.</p> Graphical abstract <p></p>

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Leaching of acanthite in the thiosulfate–glycine system

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Montserrat de Jesús Diaz-Velazquez,
  • Francisco Raúl Carrillo-Pedroza,
  • Ma. de Jesus Soria-Aguilar,
  • Juan Antonio González -Anaya,
  • Felipe de Jesús López-Saucedo

摘要

Growing environmental concerns have prompted the search for sustainable alternatives to cyanidation, the most common but toxic method for silver extraction. Sodium thiosulfate is a less hazardous lixiviant capable of dissolving silver efficiently, while glycine, a biodegradable amino acid, enhances leaching by forming stable metal complexes. This study evaluated the performance of sodium thiosulfate with glycine for acanthite (Ag2S) leaching, comparing its efficiency with conventional cyanidation. Experiments included cyanidation tests and thiosulfate systems containing 0.063 M Na₂S₂O₃, 0.02 M CuSO₄·5H₂O, and 0.026 M ethylenediaminetetraacetic acid (EDTA). In the modified system, 0.13 M glycine was added. The thiosulfate–glycine system achieved a maximum silver recovery of 54% within two hours, significantly higher than the 32% obtained without glycine. These findings demonstrate that thiosulfate–glycine leaching represents a safer and more sustainable alternative to cyanidation for large-scale silver recovery.

Graphical abstract