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<p>Due to gold’s high recycling value and unique properties, extracting it from gold-bearing waste has attracted significant attention, but effectively separating gold from metal impurities remains challenging. Herein, a synergistic extraction system using DBC and TBP as extractants was proposed for gold-impurity separation in chloride systems. Experimental results demonstrate that the DBC-TBP system exerts a synergistic effect on Au, achieving larger separation factors from Cu, Fe, and Ni than single DBC or TBP under the same conditions. The optimum specifications are solvent extraction time at 5 min, HCl concentration at 1 mol/L, extraction temperature at 25&#xa0;℃, O/A at 1:1, and first-stage gold extraction efficiency at 93.9%. In contrast, the co-extraction rates of impurities including Cu, Fe, and Ni are all around 5%, which enables the effective selective separation of gold from impurities. McCabe–Thiele diagrams and simulations confirm three stages reduce raffinate Au concentration to 5.76 mg/L, accompanying by a low co-extraction rates of impurity ions. Its mechanism was explored via FT-IR, NMR, etc., providing technical references for applying this system to gold enrichment in complex acid chloride solutions.</p> Graphical Abstract <p></p>

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Synergistic Extraction and Separation of Gold from the Chlorinated Leachate of Recycled Crude Gold Using DBC-TBP

  • 期刊论文

  • 发表日期：

    2026年2月14日

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  • Ailiang Chen,
  • Yan Ma,
  • Yongxing Zheng,
  • Xijun Zhang,
  • Sujun Lu,
  • Xingyu Chen,
  • Fenglong Sun,
  • Junling Duan,
  • Zuojuan Du

摘要

Due to gold’s high recycling value and unique properties, extracting it from gold-bearing waste has attracted significant attention, but effectively separating gold from metal impurities remains challenging. Herein, a synergistic extraction system using DBC and TBP as extractants was proposed for gold-impurity separation in chloride systems. Experimental results demonstrate that the DBC-TBP system exerts a synergistic effect on Au, achieving larger separation factors from Cu, Fe, and Ni than single DBC or TBP under the same conditions. The optimum specifications are solvent extraction time at 5 min, HCl concentration at 1 mol/L, extraction temperature at 25 ℃, O/A at 1:1, and first-stage gold extraction efficiency at 93.9%. In contrast, the co-extraction rates of impurities including Cu, Fe, and Ni are all around 5%, which enables the effective selective separation of gold from impurities. McCabe–Thiele diagrams and simulations confirm three stages reduce raffinate Au concentration to 5.76 mg/L, accompanying by a low co-extraction rates of impurity ions. Its mechanism was explored via FT-IR, NMR, etc., providing technical references for applying this system to gold enrichment in complex acid chloride solutions.

Graphical Abstract