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<p>The phase transformation of galena in H<sub>2</sub>SO<sub>4</sub>–Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> system under oxygen pressure was investigated. Results indicated that the critical conditions for the phase transformation of galena into lead jarosite (Pb-J) were 130 °C, 30 g/L H<sub>2</sub>SO<sub>4</sub>, 15 g/L Fe<sup>3+</sup>, and an oxygen partial pressure of 0.4 MPa. Furthermore, increased Fe<sup>3+</sup> concentration and oxygen partial pressure did not enhance jarosite formation. Conversely, lowering the temperature and increasing the H<sub>2</sub>SO<sub>4</sub> concentration facilitated PbSO<sub>4</sub> formation and inhibited its further conversion to Pb-J. Additionally, the effects of potassium sulfate, sodium sulfate, and high concentrations of zinc sulfate on the phase transformation of galena were examined through leaching tests, XRD, SEM-EDS, and FT-IR analyses. All three sulfates inhibited the conversion of galena to Pb-J. Among these, potassium sulfate prevented Pb-J formation and converted it more thoroughly into potassium jarosite. However, high concentrations of zinc sulfate facilitated the crystallization of both PbSO<sub>4</sub> and Pb-J, which altered the morphology of the product. Zinc ions coprecipitated with Pb-J, thereby integrating into the product.</p>

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Phase transformation behavior of galena during oxygen pressure leaching in H2SO4-Fe2(SO4)3 system

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Pu Sun,
  • Chong-jun Bao,
  • Ji-bo Wang,
  • Xing-bin Li,
  • Chang Wei,
  • Zhi-gan Deng,
  • Min-ting Li

摘要

The phase transformation of galena in H2SO4–Fe2(SO4)3 system under oxygen pressure was investigated. Results indicated that the critical conditions for the phase transformation of galena into lead jarosite (Pb-J) were 130 °C, 30 g/L H2SO4, 15 g/L Fe3+, and an oxygen partial pressure of 0.4 MPa. Furthermore, increased Fe3+ concentration and oxygen partial pressure did not enhance jarosite formation. Conversely, lowering the temperature and increasing the H2SO4 concentration facilitated PbSO4 formation and inhibited its further conversion to Pb-J. Additionally, the effects of potassium sulfate, sodium sulfate, and high concentrations of zinc sulfate on the phase transformation of galena were examined through leaching tests, XRD, SEM-EDS, and FT-IR analyses. All three sulfates inhibited the conversion of galena to Pb-J. Among these, potassium sulfate prevented Pb-J formation and converted it more thoroughly into potassium jarosite. However, high concentrations of zinc sulfate facilitated the crystallization of both PbSO4 and Pb-J, which altered the morphology of the product. Zinc ions coprecipitated with Pb-J, thereby integrating into the product.