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<p>Nickel sulfate is a critical compound for lithium-ion batteries, mainly prepared from nickel sulfide concentrate (NSC). Typically, high-temperature smelting or high-pressure leaching is required to achieve high extraction rates for Ni and Co. Here, we demonstrate an acid-free atmospheric leaching process for effectively processing of NSC using a mechanochemical treatment. When a suitable intermediate phase of the NSC is obtained, the leaching efficiency for Ni and Co can reach 97.4% and 98.8%, respectively, while the main impure element, iron, almost remains in the solid phase. As a consequence, the leaching solution can be easily treated to prepare battery-grade NiSO<sub>4</sub>. A technoeconomic analysis demonstrates that the acid-free process provides excellent economic advantages, with carbon emissions&#xa0;being reduced by 59.5%. This provides a sustainable alternative for processing complex sulfide resources and is expected to be applied to zinc and copper sulfide concentrates.</p>

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An acid-free process to prepare battery grade nickel and cobalt sulfates from complex resources

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月20日

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  • Qing Zhang,
  • Xiaohong Zheng,
  • Weiguang Lv,
  • Mingming He,
  • Wenyi Yan,
  • Wenfang Gao,
  • Pengge Ning,
  • Hongbin Cao,
  • Zhi Sun

摘要

Nickel sulfate is a critical compound for lithium-ion batteries, mainly prepared from nickel sulfide concentrate (NSC). Typically, high-temperature smelting or high-pressure leaching is required to achieve high extraction rates for Ni and Co. Here, we demonstrate an acid-free atmospheric leaching process for effectively processing of NSC using a mechanochemical treatment. When a suitable intermediate phase of the NSC is obtained, the leaching efficiency for Ni and Co can reach 97.4% and 98.8%, respectively, while the main impure element, iron, almost remains in the solid phase. As a consequence, the leaching solution can be easily treated to prepare battery-grade NiSO4. A technoeconomic analysis demonstrates that the acid-free process provides excellent economic advantages, with carbon emissions being reduced by 59.5%. This provides a sustainable alternative for processing complex sulfide resources and is expected to be applied to zinc and copper sulfide concentrates.