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<p>Currently, waste-free technologies are becoming increasingly sought-after worldwide. When working with precious metals (PM), minimizing losses is particularly important for well-known reasons. The objective of this study was to determine the parameters for PM extraction from multicomponent solutions via cementation. The study focused on an aqua regia solution obtained by dissolving gold production cementate after selective precipitation of gold. The solution composition was as follows, g/dm<sup>3</sup>: Au—1.1; Ag—0.1; Pt—27.8; Pd—11.7; Rh—2; HCl—150–200. The authors studied cementation from acidic leach solutions of gold production cementate using electronegative metals (e.g., iron, zinc, aluminum), in both dispersed (chips, granules) and compact forms. It was established that with an increase in the cementing metal consumption from 1&#xa0;to 4 g/g PM and electronegativity in the series Fe → Zn → Al, the degree of extraction of Au, Ag, Pt, Pd, and Rh increases from 62.6 to 99.2%. The use of the cementing metal in a&#xa0;compact form (e.g., plates) ensures extraction rates comparable to those of dispersed materials, while an increase in extraction from 94.6 to 98.8% was noted when using galvanized iron compared to pure iron.</p>

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Cementation extraction of precious metals from hydrochloric acid solutions

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • K. L. Timofeev,
  • Ya. D. Zelyakh,
  • R. S. Voinkov

摘要

Currently, waste-free technologies are becoming increasingly sought-after worldwide. When working with precious metals (PM), minimizing losses is particularly important for well-known reasons. The objective of this study was to determine the parameters for PM extraction from multicomponent solutions via cementation. The study focused on an aqua regia solution obtained by dissolving gold production cementate after selective precipitation of gold. The solution composition was as follows, g/dm3: Au—1.1; Ag—0.1; Pt—27.8; Pd—11.7; Rh—2; HCl—150–200. The authors studied cementation from acidic leach solutions of gold production cementate using electronegative metals (e.g., iron, zinc, aluminum), in both dispersed (chips, granules) and compact forms. It was established that with an increase in the cementing metal consumption from 1 to 4 g/g PM and electronegativity in the series Fe → Zn → Al, the degree of extraction of Au, Ag, Pt, Pd, and Rh increases from 62.6 to 99.2%. The use of the cementing metal in a compact form (e.g., plates) ensures extraction rates comparable to those of dispersed materials, while an increase in extraction from 94.6 to 98.8% was noted when using galvanized iron compared to pure iron.