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<p>The behavior of iron during the two-stage countercurrent pressure leaching of zinc sulfide concentrate was systematically investigated to elucidate its regulation mechanisms. In the first stage, controlled conditions (120&#xa0;°C, 0.2&#xa0;MPa O<sub>2</sub>, 60&#xa0;g/L H<sub>2</sub>SO<sub>4</sub>) suppressed Fe<sup>3+</sup> hydrolysis and jarosite formation, facilitating the efficient Fe<sup>2+</sup> transfer into the leachate. In the second stage, high oxygen pressure (0.8&#xa0;MPa) promoted the oxidation of Fe<sup>2+</sup> to Fe<sup>3+</sup>, enhancing mineral dissolution, while the residual acid (~50&#xa0;g/L) inhibited Fe<sup>3+</sup> precipitation. As a result, over 98% of Zn and 81% of Fe were extracted, with Fe primarily present as Fe<sup>2+</sup> in the first-stage solution, while a small fraction remained as pyrite in the residue. Lead and sulfur were concentrated as lead sulfate and elemental sulfur, respectively. These findings provide a practical approach for optimizing Fe control, contributing to the optimization and sustainability of zinc pressure leaching processes.</p>

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Iron Leaching Behavior During Oxygen Pressure Leaching of Zinc Sulfide Concentrate

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • Pu Sun,
  • Jibo Wang,
  • Xingbin Li,
  • Yin Li,
  • Chang Wei,
  • Zhigan Deng,
  • Minting Li

摘要

The behavior of iron during the two-stage countercurrent pressure leaching of zinc sulfide concentrate was systematically investigated to elucidate its regulation mechanisms. In the first stage, controlled conditions (120 °C, 0.2 MPa O2, 60 g/L H2SO4) suppressed Fe3+ hydrolysis and jarosite formation, facilitating the efficient Fe2+ transfer into the leachate. In the second stage, high oxygen pressure (0.8 MPa) promoted the oxidation of Fe2+ to Fe3+, enhancing mineral dissolution, while the residual acid (~50 g/L) inhibited Fe3+ precipitation. As a result, over 98% of Zn and 81% of Fe were extracted, with Fe primarily present as Fe2+ in the first-stage solution, while a small fraction remained as pyrite in the residue. Lead and sulfur were concentrated as lead sulfate and elemental sulfur, respectively. These findings provide a practical approach for optimizing Fe control, contributing to the optimization and sustainability of zinc pressure leaching processes.