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<p>This study presents a sustainable and selective hydrometallurgical process through a sequential solvent extraction for the purification of a pregnant leach solution (PLS) obtained from mixed hydroxide precipitate (MHP), targeting the production of battery-grade nickel sulfate. Bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex 272) was employed to selectively extract cobalt, manganese, and copper from nickel under optimized conditions (pH 5.0, 30% v/v extractant, O/A = 0.25, two stages), achieving near-complete removal of impurities with limited magnesium co-extraction. Neodecanoic acid (Versatic 10) was subsequently used to separate nickel from residual magnesium at pH 7.0, 30% v/v extractant, and O/A = 0.5, resulting in nearly complete nickel extraction with minimal impurity uptake. Magnesium was effectively scrubbed, and nickel was quantitatively stripped using dilute sulfuric acid. The purified strip solution was crystallized to produce nickel sulfate hexahydrate (NiSO₄·6H₂O) with a nickel content of 22.15%, meeting specifications for lithium-ion battery cathode materials. This process demonstrates high selectivity, reagent efficiency, and industrial relevance for sustainable nickel refining from intermediate resources.</p> Graphical Abstract <p></p>

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Sequential Solvent Extraction Purification of Mixed Hydroxide Precipitate Leach Solutions Using Cyanex 272 and Versatic 10 for Battery-Grade Nickel Sulfate Production

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Zela Tanlega Ichlas,
  • Visensius Dhita Andriyanto,
  • Joobeom Seo,
  • Seongsoo Han,
  • Mohammad Zaki Mubarok

摘要

This study presents a sustainable and selective hydrometallurgical process through a sequential solvent extraction for the purification of a pregnant leach solution (PLS) obtained from mixed hydroxide precipitate (MHP), targeting the production of battery-grade nickel sulfate. Bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex 272) was employed to selectively extract cobalt, manganese, and copper from nickel under optimized conditions (pH 5.0, 30% v/v extractant, O/A = 0.25, two stages), achieving near-complete removal of impurities with limited magnesium co-extraction. Neodecanoic acid (Versatic 10) was subsequently used to separate nickel from residual magnesium at pH 7.0, 30% v/v extractant, and O/A = 0.5, resulting in nearly complete nickel extraction with minimal impurity uptake. Magnesium was effectively scrubbed, and nickel was quantitatively stripped using dilute sulfuric acid. The purified strip solution was crystallized to produce nickel sulfate hexahydrate (NiSO₄·6H₂O) with a nickel content of 22.15%, meeting specifications for lithium-ion battery cathode materials. This process demonstrates high selectivity, reagent efficiency, and industrial relevance for sustainable nickel refining from intermediate resources.

Graphical Abstract