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<p>The demand for Ni and Co has surged due to the rapid expansion of the electric vehicle industry. Thus, developing efficient and eco-friendly metallurgical routes for extracting these metals has become imperative. This study introduces a sustainable and effective method for extracting Ni and Co from Ni–Co–Fe alloy powder obtained from limonitic laterite ores through selective reduction and magnetic separation. The leaching efficiency for Ni, Co, and Fe was 89.4%, 94.8%, and 96.5%, respectively, under the following conditions for leaching: 3 mol/L H<sub>2</sub>SO<sub>4</sub>, 85°C, 10 mL/g liquid–solid ratio, and 90 min leaching time. The incorporation of H<sub>2</sub>O<sub>2</sub> enhanced the leaching efficiency for Ni, Co, and Fe. The redox potential of the solution plays a crucial role in acid dissolution, and H<sub>2</sub>O<sub>2</sub> enhances Ni and Co dissolution. Phosphate precipitation facilitated the removal of Fe from the leachate, affording a 96.1% Fe removal ratio and 2.29% Ni loss.</p>

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Oxidative acid leaching behavior of Fe–Ni–Co alloy powder derived from a laterite ore

  • 期刊论文

  • 发表日期：

    2025年3月26日

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  • Meishi Hu,
  • Jing Chen,
  • Mingjun Rao,
  • Siyu Chen,
  • Jun Luo,
  • Guanghui Li,
  • Tao Jiang

摘要

The demand for Ni and Co has surged due to the rapid expansion of the electric vehicle industry. Thus, developing efficient and eco-friendly metallurgical routes for extracting these metals has become imperative. This study introduces a sustainable and effective method for extracting Ni and Co from Ni–Co–Fe alloy powder obtained from limonitic laterite ores through selective reduction and magnetic separation. The leaching efficiency for Ni, Co, and Fe was 89.4%, 94.8%, and 96.5%, respectively, under the following conditions for leaching: 3 mol/L H2SO4, 85°C, 10 mL/g liquid–solid ratio, and 90 min leaching time. The incorporation of H2O2 enhanced the leaching efficiency for Ni, Co, and Fe. The redox potential of the solution plays a crucial role in acid dissolution, and H2O2 enhances Ni and Co dissolution. Phosphate precipitation facilitated the removal of Fe from the leachate, affording a 96.1% Fe removal ratio and 2.29% Ni loss.