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<p>The separation of zinc (Zn) and iron (Fe) remains a persistent challenge in zinc hydrometallurgy. To achieve clean iron removal from high-sulfate zinc-leaching solutions (Zn<sup>2+</sup>  &gt; 100&#xa0;g/L, Fe<sup>2+</sup>  ~ 30&#xa0;g/L), the hematite precipitation process operated at 150−180℃ was systematically investigated. The process was demonstrated to be technically feasible for a representative leach liquor containing ~ 113&#xa0;g/L Zn<sup>2+</sup> and ~ 28&#xa0;g/L Fe<sup>2+</sup>. The recommended operating conditions include a temperature range of 150−180℃, an oxygen partial pressure of 0.4&#xa0;MPa, oxygen injection initiated at 100℃, an agitation speed of 500&#xa0;rpm, and a minimum reaction time of 3&#xa0;h. Under these conditions, the dissolved Fe concentration decreased from ~ 28&#xa0;g/L to 4−6&#xa0;g/L, corresponding to an Fe removal efficiency of 78–85%. The post-treatment solution is suitable for recycling to the zinc-leaching circuit. The resulting solid by-product contained more than 55% Fe, less than 1% Zn, and less than 4% S, and was predominantly composed of hematite (<i>α</i>-Fe<sub>2</sub>O<sub>3</sub>), with minor amounts of goethite (<i>α</i>-FeOOH) and jarosite phases ((K, H<sub>3</sub>O)Fe<sub>3</sub>(SO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub> and NaFe<sub>3</sub>(SO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>). Overall, hematite precipitation at 150–180℃ provides an effective robust approach for treating Zn-high and Fe-rich leach solutions, demonstrating strong potential for industrial application.</p>

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Iron Precipitation from High-Zinc Solution Using Low-Temperature Hematite Process

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • Xiaohua Peng,
  • Gang Xu,
  • Wei Zou,
  • Mei Zhang,
  • Jiayi Bao,
  • Jiaqiang Jin,
  • Weiwei Liu,
  • Tieguang Dong

摘要

The separation of zinc (Zn) and iron (Fe) remains a persistent challenge in zinc hydrometallurgy. To achieve clean iron removal from high-sulfate zinc-leaching solutions (Zn2+  > 100 g/L, Fe2+  ~ 30 g/L), the hematite precipitation process operated at 150−180℃ was systematically investigated. The process was demonstrated to be technically feasible for a representative leach liquor containing ~ 113 g/L Zn2+ and ~ 28 g/L Fe2+. The recommended operating conditions include a temperature range of 150−180℃, an oxygen partial pressure of 0.4 MPa, oxygen injection initiated at 100℃, an agitation speed of 500 rpm, and a minimum reaction time of 3 h. Under these conditions, the dissolved Fe concentration decreased from ~ 28 g/L to 4−6 g/L, corresponding to an Fe removal efficiency of 78–85%. The post-treatment solution is suitable for recycling to the zinc-leaching circuit. The resulting solid by-product contained more than 55% Fe, less than 1% Zn, and less than 4% S, and was predominantly composed of hematite (α-Fe2O3), with minor amounts of goethite (α-FeOOH) and jarosite phases ((K, H3O)Fe3(SO4)2(OH)6 and NaFe3(SO4)2(OH)6). Overall, hematite precipitation at 150–180℃ provides an effective robust approach for treating Zn-high and Fe-rich leach solutions, demonstrating strong potential for industrial application.