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<p>Conventional cyanidation methods for gold extraction face considerable environmental challenges. Here, we propose an environmentally benign approach for gold extraction from desulfurized gold concentrate through in situ capture using molten iron. During smelting reduction, iron oxides in the concentrate are reduced to form a liquid iron phase, which efficiently captures and concentrates gold into an iron alloy. The feasibility and reliability of this process were systematically assessed through thermodynamic analysis and laboratory-scale experiments. The effects of slag basicity, carbon dosage, smelting temperature, and holding time on the recovery of iron and gold in the alloy were investigated. Under optimized conditions, slag basicity of 1.0, carbon dosage of 12.0&#xa0;wt.%, smelting temperature of 1500°C, and holding time of 60&#xa0;min, recovery rates reached 94.5% for iron and 98.3% for gold, with the resulting alloy containing 162.1&#xa0;g/t Au, 224.0&#xa0;g/t Ag, and 94.3&#xa0;wt.% Fe. Additionally, copper partitioned into the iron alloy, while lead and zinc primarily volatilized into the flue dust. Silver exhibited dual behavior: partial retention in the alloy and partial volatilization into the dust. This work demonstrates a sustainable and efficient pathway for recovering valuable metals from desulfurized gold concentrates, offering notable environmental advantages over conventional cyanide-based processes.</p>

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Green Extraction of Gold from Desulfurized Gold Concentrate via In-Situ Capture with Molten Iron Collector During Smelting Reduction

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • Fashang Chen,
  • Shiyang Liu,
  • Wenqing Qin,
  • Fen Jiao,
  • Haige Chen,
  • Zheng Chang,
  • Jiming Zhang,
  • Hongbin Ling

摘要

Conventional cyanidation methods for gold extraction face considerable environmental challenges. Here, we propose an environmentally benign approach for gold extraction from desulfurized gold concentrate through in situ capture using molten iron. During smelting reduction, iron oxides in the concentrate are reduced to form a liquid iron phase, which efficiently captures and concentrates gold into an iron alloy. The feasibility and reliability of this process were systematically assessed through thermodynamic analysis and laboratory-scale experiments. The effects of slag basicity, carbon dosage, smelting temperature, and holding time on the recovery of iron and gold in the alloy were investigated. Under optimized conditions, slag basicity of 1.0, carbon dosage of 12.0 wt.%, smelting temperature of 1500°C, and holding time of 60 min, recovery rates reached 94.5% for iron and 98.3% for gold, with the resulting alloy containing 162.1 g/t Au, 224.0 g/t Ag, and 94.3 wt.% Fe. Additionally, copper partitioned into the iron alloy, while lead and zinc primarily volatilized into the flue dust. Silver exhibited dual behavior: partial retention in the alloy and partial volatilization into the dust. This work demonstrates a sustainable and efficient pathway for recovering valuable metals from desulfurized gold concentrates, offering notable environmental advantages over conventional cyanide-based processes.