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<p>A sequential purification approach was investigated for the selective recovery of manganese from complex leachates derived from laterite nickel processing residues. The manganese-rich leachate was produced by industrially relevant reductive leaching of Mn-bearing residue using pyrite (FeS<sub>2</sub>), and the present work focuses on the downstream purification of this solution. In the first (coarse) purification phase, pH-controlled precipitation via lime milk (Ca(OH)<sub>2</sub> suspension) was applied to remove major impurities. Under optimized conditions (pH 5.00, 45&#xa0;°C, 2&#xa0;h), 100% removal of Fe and Al was achieved, yielding a filtrate containing 56.5&#xa0;g/L Mn with substantially reduced impurities. The resulting residue was composed of dehydrated gypsum encapsulating coprecipitated metals. In the subsequent (fine) phase, liquid–liquid extraction using Cyanex 272 diluted in kerosene was optimized (feed pH 5.00, 40% saponification, 25% extractant), achieving over 99% manganese extraction yield within three theoretical stages at an organic-to-aqueous (O/A) ratio of 6.00, or four stages at 3.00. Subsequent stripping with 1:1 HCl (O/A 0.10) yielded a purified leachate containing 58.86&#xa0;g/L Mn, with Co below 0.30&#xa0;g/L and Ni, Ca, Mg below 0.10&#xa0;g/L; all other impurities were below 0.01&#xa0;g/L. The purified manganese solution is suitable as an intermediate MnCl<sub>2</sub> feedstock for further refining or industrial chemical production. Overall, the results demonstrate that the combination of lime milk precipitation and solvent extraction using Cyanex 272 constitutes an effective purification route for manganese-rich leachates generated during laterite nickel processing, offering a practical pathway for the utilization of secondary manganese resources.</p> Graphical Abstract <p></p>

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Sequential Purification of Manganese-Rich Leachate from Laterite Nickel Processing Residue

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Daffa Kaditya Tayip,
  • Kaihua Xu,
  • Jian Yang,
  • Wenjing Wan,
  • Anita Kusuma Wardani,
  • Yongming Chen

摘要

A sequential purification approach was investigated for the selective recovery of manganese from complex leachates derived from laterite nickel processing residues. The manganese-rich leachate was produced by industrially relevant reductive leaching of Mn-bearing residue using pyrite (FeS2), and the present work focuses on the downstream purification of this solution. In the first (coarse) purification phase, pH-controlled precipitation via lime milk (Ca(OH)2 suspension) was applied to remove major impurities. Under optimized conditions (pH 5.00, 45 °C, 2 h), 100% removal of Fe and Al was achieved, yielding a filtrate containing 56.5 g/L Mn with substantially reduced impurities. The resulting residue was composed of dehydrated gypsum encapsulating coprecipitated metals. In the subsequent (fine) phase, liquid–liquid extraction using Cyanex 272 diluted in kerosene was optimized (feed pH 5.00, 40% saponification, 25% extractant), achieving over 99% manganese extraction yield within three theoretical stages at an organic-to-aqueous (O/A) ratio of 6.00, or four stages at 3.00. Subsequent stripping with 1:1 HCl (O/A 0.10) yielded a purified leachate containing 58.86 g/L Mn, with Co below 0.30 g/L and Ni, Ca, Mg below 0.10 g/L; all other impurities were below 0.01 g/L. The purified manganese solution is suitable as an intermediate MnCl2 feedstock for further refining or industrial chemical production. Overall, the results demonstrate that the combination of lime milk precipitation and solvent extraction using Cyanex 272 constitutes an effective purification route for manganese-rich leachates generated during laterite nickel processing, offering a practical pathway for the utilization of secondary manganese resources.

Graphical Abstract