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<p>The dissolution behavior of chalcopyrite concentrate was investigated through the combined effects of chloride ions, electrochemical potential control, and mechanical activation. A Taguchi mixed-level design was employed to evaluate the influence of NaCl concentration, H₂SO₄ concentration, and temperature, with solution potential maintained between 420 and 440 mV using Fe²⁺/Fe³⁺ and H₂O₂. Both signal-to-noise (S/N) analysis and ANOVA identified sulfuric acid concentration as the most significant factor, while temperature and chloride concentration also contributed to copper recovery. Under optimized conditions (25&#xa0;g/l NaCl, 0.4&#xa0;M H₂SO₄, 80&#xa0;°C), a maximum recovery of 56.2% was achieved within 8&#xa0;h. Mechanical activation (4&#xa0;h, 750&#xa0;rpm) further enhanced copper leaching, and integration with chloride-assisted, potential-controlled conditions yielded a recovery of 73.1%. These results demonstrate that combining potential control, chloride addition, and particle size reduction provides a synergistic effect that substantially improves chalcopyrite leaching efficiency.</p>

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Chloride-Enhanced Chalcopyrite Leaching Under Controlled Electrochemical Potential and Mechanical Activation

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Mohammadreza AziziKasin,
  • Behzad Shahbazi

摘要

The dissolution behavior of chalcopyrite concentrate was investigated through the combined effects of chloride ions, electrochemical potential control, and mechanical activation. A Taguchi mixed-level design was employed to evaluate the influence of NaCl concentration, H₂SO₄ concentration, and temperature, with solution potential maintained between 420 and 440 mV using Fe²⁺/Fe³⁺ and H₂O₂. Both signal-to-noise (S/N) analysis and ANOVA identified sulfuric acid concentration as the most significant factor, while temperature and chloride concentration also contributed to copper recovery. Under optimized conditions (25 g/l NaCl, 0.4 M H₂SO₄, 80 °C), a maximum recovery of 56.2% was achieved within 8 h. Mechanical activation (4 h, 750 rpm) further enhanced copper leaching, and integration with chloride-assisted, potential-controlled conditions yielded a recovery of 73.1%. These results demonstrate that combining potential control, chloride addition, and particle size reduction provides a synergistic effect that substantially improves chalcopyrite leaching efficiency.