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<p>This study proposes an efficient recovery method based on pyrometallurgical smelting with in situ iron collection technology to address these dual challenges. Through high-temperature carbothermic reduction, hematite in CTs was converted into metallic iron, which subsequently captured gold from the melt through in situ phase formation, producing gold-iron alloy and glassy slag while thermally decomposing cyanides. Under the optimized slag system (4&#xa0;mol%MgO-25&#xa0;mol%-FeO-CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>) with key operational parameters including 5&#xa0;wt% coke addition, slag basicity R = 0.5 (adjusted by CaO), smelting temperature of 1500&#xa0;°C, and smelting holding time of 60&#xa0;min, remarkable results were achieved: a 99.55% gold recovery rate, 13.1&#xa0;g/ton gold content in the alloy, and residual gold of merely 0.03&#xa0;g/ton in slag. Industrial-scale trials validated the technical feasibility, maintaining stable gold recovery at 99.40%. The developed process provides an economically viable and environmentally sustainable solution for efficient gold recovery from CTs.</p>

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Highly Efficient Gold Recovery from Cyanidation Tailings via In Situ Reduced Iron Collection Method

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Guoqing Liu,
  • Shuchen Sun,
  • Ganfeng Tu,
  • Shubo A,
  • Fan Chen,
  • Jingyi Chen,
  • Hao Wu,
  • Xinyu Cao,
  • Faxin Xiao,
  • Kuopei Yu,
  • Chengfu Sui

摘要

This study proposes an efficient recovery method based on pyrometallurgical smelting with in situ iron collection technology to address these dual challenges. Through high-temperature carbothermic reduction, hematite in CTs was converted into metallic iron, which subsequently captured gold from the melt through in situ phase formation, producing gold-iron alloy and glassy slag while thermally decomposing cyanides. Under the optimized slag system (4 mol%MgO-25 mol%-FeO-CaO-SiO2-Al2O3) with key operational parameters including 5 wt% coke addition, slag basicity R = 0.5 (adjusted by CaO), smelting temperature of 1500 °C, and smelting holding time of 60 min, remarkable results were achieved: a 99.55% gold recovery rate, 13.1 g/ton gold content in the alloy, and residual gold of merely 0.03 g/ton in slag. Industrial-scale trials validated the technical feasibility, maintaining stable gold recovery at 99.40%. The developed process provides an economically viable and environmentally sustainable solution for efficient gold recovery from CTs.