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<p>Phosphoric acid was used to investigate the extraction of nickel and cobalt from limonite ore while recovering iron in the residue in an atmospheric pressure. The current study aims to identify the leaching mechanism and kinetics. Thermodynamic analyses indicated that selective leaching of nickel and cobalt over iron occurs at a pH below 4.7, where iron remains as solid precipitates in the form of iron phosphate dihydrate. According to the phase and compositional analyses of the residue obtained during leaching, iron and phosphorus were analyzed to be 24.8 and 13.7 pct, respectively, as the primary elements. The content of minor elements summed up to 4.8 pct with silica being the major component. The kinetics analyses identified that the leaching process followed the product layer diffusion control of the shrinking core model where the activation energies were evaluated to be 31.9 kJ/mol for nickel and 8.5 kJ/mol for cobalt in the temperature range of 50 to 100 °C.</p>

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Phosphoric Acid Leaching of Laterite Ore: Mechanism and Kinetics Analysis of Ni and Co Extraction

  • 期刊论文

  • 发表日期：

    2025年4月14日

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  • Muhamad Nawawi Alif,
  • Seongjin Kim,
  • Leonardo Tomas Da Rocha,
  • Sung-Mo Jung

摘要

Phosphoric acid was used to investigate the extraction of nickel and cobalt from limonite ore while recovering iron in the residue in an atmospheric pressure. The current study aims to identify the leaching mechanism and kinetics. Thermodynamic analyses indicated that selective leaching of nickel and cobalt over iron occurs at a pH below 4.7, where iron remains as solid precipitates in the form of iron phosphate dihydrate. According to the phase and compositional analyses of the residue obtained during leaching, iron and phosphorus were analyzed to be 24.8 and 13.7 pct, respectively, as the primary elements. The content of minor elements summed up to 4.8 pct with silica being the major component. The kinetics analyses identified that the leaching process followed the product layer diffusion control of the shrinking core model where the activation energies were evaluated to be 31.9 kJ/mol for nickel and 8.5 kJ/mol for cobalt in the temperature range of 50 to 100 °C.