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<p>This research investigates the efficient removal of iron (Fe) from a laterite pregnant leach solution while minimizing nickel (Ni) losses through a precipitation strategy. Three precipitating agents, CaCO<sub>3</sub>, NaOH, and MgO, were assessed for their Fe removal capabilities. The precipitation process was conducted in a semibatch condition, with the precipitating agent added dropwise to the pregnant leach solution. A thorough analysis was conducted to delve deeper into the kinetics of this process. The experimental results unequivocally demonstrate that CaCO<sub>3</sub> outperforms the other agents, achieving a 78% Fe removal under optimized conditions of pH 6, a reaction time of 60&#xa0;min, and a temperature of 60&#xa0;°C. However, 36.78% of the nickel is concurrently lost during the process. The activation energy was determined to be 18.04&#xa0;kJ/mol, suggesting that the reaction is relatively facile and energy-efficient. Furthermore, the kinetic analysis revealed that the Fe removal process follows a second-order reaction mechanism with diffusion as the controlling step. This insight into the kinetics provides valuable information for process optimization and scale-up considerations. The findings emphasize the importance of selecting the appropriate precipitating agent and optimizing operational parameters to achieve the desired balance between Fe removal efficiency and Ni loss mitigation.</p>

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Fe Removal Strategy from Morowali Laterite Pregnant Leach Solution: Optimization and Kinetic Study

  • 期刊论文

  • 发表日期：

    2025年8月22日

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  • Gyan Prameswara,
  • Yohandri Bow,
  • Himmah Sekar Eka Ayu Gustiana,
  • Flaviana Yohanala Prista Tyassena,
  • Wisnu Yudhistira,
  • Gian Ananta,
  • Muhammad Andyka Ramadhan Arif,
  • Ahmad Muflih Mustafa,
  • Herlina Rahim,
  • Andi Arninda,
  • Sariwahyuni,
  • Sri Diana,
  • Iga Trisnawati,
  • Himawan Tri Bayu Murti Petrus,
  • Dewi Purnama Sari

摘要

This research investigates the efficient removal of iron (Fe) from a laterite pregnant leach solution while minimizing nickel (Ni) losses through a precipitation strategy. Three precipitating agents, CaCO3, NaOH, and MgO, were assessed for their Fe removal capabilities. The precipitation process was conducted in a semibatch condition, with the precipitating agent added dropwise to the pregnant leach solution. A thorough analysis was conducted to delve deeper into the kinetics of this process. The experimental results unequivocally demonstrate that CaCO3 outperforms the other agents, achieving a 78% Fe removal under optimized conditions of pH 6, a reaction time of 60 min, and a temperature of 60 °C. However, 36.78% of the nickel is concurrently lost during the process. The activation energy was determined to be 18.04 kJ/mol, suggesting that the reaction is relatively facile and energy-efficient. Furthermore, the kinetic analysis revealed that the Fe removal process follows a second-order reaction mechanism with diffusion as the controlling step. This insight into the kinetics provides valuable information for process optimization and scale-up considerations. The findings emphasize the importance of selecting the appropriate precipitating agent and optimizing operational parameters to achieve the desired balance between Fe removal efficiency and Ni loss mitigation.