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This study presents a green cobaltCobalt extractionCobalt extraction methodExtraction from Zebesha ore in Zambia, combining carbothermic reductionCarbothermic reduction roasting with microwave-assisted leachingLeaching (MWL)Microwave-assisted leaching and conventional leaching (CL)Conventional leaching. Ore mixed with 20 wt.% charcoal was roasted at 650 °C for 1.5 h in air, reducing Co₂O₃·H₂O to CoOIn-situ reductant (CoO). A 1:1 mixture of roasted and unroasted ore was leached under MWL and CL conditions. The CoO in the roasted portion served as an in-situ reductantIn-situ reductant (CoO), converting Co3⁺ to Co2⁺ in the unroasted ore. MWL achieved 98.0% cobaltExtraction extractionCobalt extraction in 30 min, compared to 96.5% in 180 min for CL. This method eliminates sodium metabisulphite, avoiding harmful sodium sulphate byproducts. The approach provides a sustainable, low-energy route for cobaltCobalt recoveryRecovery from both primary ores and secondary resources such as spentSpent Lithium-Ion Batteries (LIBs) lithium-ion batteriesLithium-Ion Batteries (LIBs).

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Sustainable Cobalt Leaching Using In-Situ CoO Reduction: A Microwave-Driven Solution for Complex Ores

  • 会议论文

  • 发表日期：

    2026年

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  • Beatia Siame,
  • Moses Charles Siame,
  • Joseph Kafumbila,
  • Yotamu R. S. Hara,
  • Makwenda Ngomba,
  • Somo Sakambuki,
  • Cheryl Shaw,
  • Ian M. Reaney

摘要

This study presents a green cobaltCobalt extractionCobalt extraction methodExtraction from Zebesha ore in Zambia, combining carbothermic reductionCarbothermic reduction roasting with microwave-assisted leachingLeaching (MWL)Microwave-assisted leaching and conventional leaching (CL)Conventional leaching. Ore mixed with 20 wt.% charcoal was roasted at 650 °C for 1.5 h in air, reducing Co₂O₃·H₂O to CoOIn-situ reductant (CoO). A 1:1 mixture of roasted and unroasted ore was leached under MWL and CL conditions. The CoO in the roasted portion served as an in-situ reductantIn-situ reductant (CoO), converting Co3⁺ to Co2⁺ in the unroasted ore. MWL achieved 98.0% cobaltExtraction extractionCobalt extraction in 30 min, compared to 96.5% in 180 min for CL. This method eliminates sodium metabisulphite, avoiding harmful sodium sulphate byproducts. The approach provides a sustainable, low-energy route for cobaltCobalt recoveryRecovery from both primary ores and secondary resources such as spentSpent Lithium-Ion Batteries (LIBs) lithium-ion batteriesLithium-Ion Batteries (LIBs).