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<p>This article presents an experimental study on the removal of copper from circulating cyanide solutions generated during the leaching of gold–copper ores. An industrial cyanide liquor containing 1039&#xa0;mg/L Cu was used as the feed solution. Dynamic mode column tests were conducted to evaluate the effect of flow rate (2, 4, and 6 bed volumes per hour) on the sorption kinetics and capacity of AV-17-8 resin. At a flow rate of 4 bed volumes per hour, the resin exhibits rapid process kinetics (complete saturation in approximately 11.6&#xa0;h) and high sorption capacity (~ 91.6&#xa0;mg Cu/g), while maintaining an acceptable column operating time. Copper desorption was studied using NaCl-based eluents (18%) with varying NaOH concentrations (0.1%, 0.25%, 0.5%, and 1%), as well as without NaOH. The results show that effective desorption occurs over a wide range of eluent compositions. Multicycle tests (three sorption–desorption cycles) demonstrate process stability: the resin consistently restores its sorption capacity after chloride–alkaline regeneration, the residual copper content after desorption remains constant (~ 25&#xa0;mg/g), and the overall degree of desorption per cycle is approximately 70%. The results obtained confirm the technological and practical feasibility of implementing an ion-exchange flowsheet to enhance gold recovery efficiency and to produce concentrated copper-bearing eluates suitable for subsequent processing.</p>

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Ion-Exchange Recovery of Copper from Gold–Copper Cyanide Solutions

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Bauyrzhan Surimbayev,
  • Yernazar Kanaly,
  • Lyudmila Bolotova,
  • Mukhitdin Akzharkenov,
  • Brajendra Mishra,
  • Yerlan Yessengarayev

摘要

This article presents an experimental study on the removal of copper from circulating cyanide solutions generated during the leaching of gold–copper ores. An industrial cyanide liquor containing 1039 mg/L Cu was used as the feed solution. Dynamic mode column tests were conducted to evaluate the effect of flow rate (2, 4, and 6 bed volumes per hour) on the sorption kinetics and capacity of AV-17-8 resin. At a flow rate of 4 bed volumes per hour, the resin exhibits rapid process kinetics (complete saturation in approximately 11.6 h) and high sorption capacity (~ 91.6 mg Cu/g), while maintaining an acceptable column operating time. Copper desorption was studied using NaCl-based eluents (18%) with varying NaOH concentrations (0.1%, 0.25%, 0.5%, and 1%), as well as without NaOH. The results show that effective desorption occurs over a wide range of eluent compositions. Multicycle tests (three sorption–desorption cycles) demonstrate process stability: the resin consistently restores its sorption capacity after chloride–alkaline regeneration, the residual copper content after desorption remains constant (~ 25 mg/g), and the overall degree of desorption per cycle is approximately 70%. The results obtained confirm the technological and practical feasibility of implementing an ion-exchange flowsheet to enhance gold recovery efficiency and to produce concentrated copper-bearing eluates suitable for subsequent processing.