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<p>The leaching kinetics of pyrite in an H<sub>2</sub>SO<sub>4</sub>–Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> system under oxygen pressure were investigated. The results indicated that iron extraction was nearly independent of the agitation rate when it exceeded 600&#xa0;rpm. Subsequently, Fe extraction positively correlated with temperature, H<sub>2</sub>SO<sub>4</sub> concentration, Fe<sup>3</sup>⁺ concentration, and oxygen partial pressure, while it increased with decreasing particle size. At temperatures ranging from 110 to 170&#xa0;°C, the pyrite leaching process was primarily controlled by chemical reactions. The activation energy and reaction orders of key parameters were determined through the establishment of a shrinking core model combined with Arrhenius equation analysis. The apparent activation energy was 38.74&#xa0;kJ/mol, and the reaction orders concerning particle size, H<sub>2</sub>SO<sub>4</sub> concentration, Fe<sup>3+</sup> concentration, and oxygen partial pressure were, − 0.91, 0.10, 0.14, and 0.54, respectively. A kinetic equation for the leaching process was established. Additionally, XRD, SEM, and XPS reveals that &gt; 95% of Fe is oxidized to Fe<sup>3+</sup>, while sulfur follows a thiosulfate pathway, ultimately forming sulfate without detectable elemental sulfur intermediates.</p> Graphical Abstract <p></p>

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Leaching Kinetics and Mechanisms of Pyrite in an H2SO4–Fe2(SO4)3 System Under Oxygen Pressure

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Pu Sun,
  • Xing-bin Li,
  • Ji-bo Wang,
  • Chang Wei,
  • Zhi-gan Deng,
  • Minting Li

摘要

The leaching kinetics of pyrite in an H2SO4–Fe2(SO4)3 system under oxygen pressure were investigated. The results indicated that iron extraction was nearly independent of the agitation rate when it exceeded 600 rpm. Subsequently, Fe extraction positively correlated with temperature, H2SO4 concentration, Fe3⁺ concentration, and oxygen partial pressure, while it increased with decreasing particle size. At temperatures ranging from 110 to 170 °C, the pyrite leaching process was primarily controlled by chemical reactions. The activation energy and reaction orders of key parameters were determined through the establishment of a shrinking core model combined with Arrhenius equation analysis. The apparent activation energy was 38.74 kJ/mol, and the reaction orders concerning particle size, H2SO4 concentration, Fe3+ concentration, and oxygen partial pressure were, − 0.91, 0.10, 0.14, and 0.54, respectively. A kinetic equation for the leaching process was established. Additionally, XRD, SEM, and XPS reveals that > 95% of Fe is oxidized to Fe3+, while sulfur follows a thiosulfate pathway, ultimately forming sulfate without detectable elemental sulfur intermediates.

Graphical Abstract