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<p>The escalating pace of global industrial expansion has led to a progressive decline in land-based mineral reserves, necessitating the exploration of marine mineral deposits as a crucial alternative for sustainable resource development. An innovative method was developed in this study, utilizing ammonium sulfate-assisted roasting at low temperatures followed by water-leaching, facilitating the eco-friendly extraction of valuable metals from deep-sea cobalt-rich crusts. The results demonstrated that roasting with (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> enabled the reduction of manganese oxides and cobalt oxides in the crusts while converting metal oxides into sulfates. Under optimized conditions, Mn in the roasting slag existed in the form of MnSO<sub>4</sub> and (NH<sub>4</sub>)<sub>2</sub>Mn<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>, Fe mainly existed in the form of NH<sub>4</sub>Fe(SO<sub>4</sub>)<sub>2</sub>, and Cu, Co, and Ni existed as CuSO<sub>4</sub>, CoSO<sub>4</sub>, and NiSO<sub>4</sub>. Subsequent water leaching achieved extraction efficiencies of 98.19% for Mn, 61.36% for Fe, 91.04% for Cu, 96.64% for Co, and 95.28% for Ni. The leaching solution could be recycled as a leaching agent for the roasting slag to concentrate valuable metals, thereby enhancing the economic feasibility of downstream recovery processes. This process enables the effective extraction of copper, cobalt, nickel, and manganese from cobalt-rich crusts under mild conditions (without strong acids or alkalis), offering a novel approach for deep-sea mineral resource processing.</p>

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An Innovative Low-Temperature Roasting and Water-Leaching Process for Extracting Valuable Metals from Oceanic Cobalt-Rich Crusts

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Jinrong Ju,
  • Tao Long,
  • Sha Deng,
  • Wei Yang,
  • Yali Feng

摘要

The escalating pace of global industrial expansion has led to a progressive decline in land-based mineral reserves, necessitating the exploration of marine mineral deposits as a crucial alternative for sustainable resource development. An innovative method was developed in this study, utilizing ammonium sulfate-assisted roasting at low temperatures followed by water-leaching, facilitating the eco-friendly extraction of valuable metals from deep-sea cobalt-rich crusts. The results demonstrated that roasting with (NH4)2SO4 enabled the reduction of manganese oxides and cobalt oxides in the crusts while converting metal oxides into sulfates. Under optimized conditions, Mn in the roasting slag existed in the form of MnSO4 and (NH4)2Mn2(SO4)3, Fe mainly existed in the form of NH4Fe(SO4)2, and Cu, Co, and Ni existed as CuSO4, CoSO4, and NiSO4. Subsequent water leaching achieved extraction efficiencies of 98.19% for Mn, 61.36% for Fe, 91.04% for Cu, 96.64% for Co, and 95.28% for Ni. The leaching solution could be recycled as a leaching agent for the roasting slag to concentrate valuable metals, thereby enhancing the economic feasibility of downstream recovery processes. This process enables the effective extraction of copper, cobalt, nickel, and manganese from cobalt-rich crusts under mild conditions (without strong acids or alkalis), offering a novel approach for deep-sea mineral resource processing.