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<p>The hydrometallurgical process for laterite nickel ore has become an important component of nickel metallurgy. However, efficient recovery of valuable components such as nickel, cobalt, manganese, iron, and aluminum from hydrometallurgical leachate still faces challenges including serious entrainment, low recovery efficiency, and high reagent consumption. This study, based on the nitric acid pressure leaching process, utilized regenerated magnesium oxide as a neutralizing agent to investigate its effects on valuable component entrainment and filtration performance during the precipitation and separation of nickel, cobalt, iron, and aluminum from hydrometallurgical leachates. The influences of temperature, time, and precipitation pH on aluminum precipitation, iron–aluminum coprecipitation, and nickel–cobalt precipitation were studied. Magnesium oxide passivated at 500&#xa0;°C was used as the precipitant, added in dry powder form. After 2&#xa0;h of precipitation, aluminum was completely precipitated, with the nickel precipitation efficiency approximately 15–20%, which was lower than the 25% precipitation rate before optimization. Moreover, through material balance calculation of magnesium oxide, it was determined that precipitating aluminum first can minimize magnesium oxide loss.</p> Graphical Abstract <p></p>

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The Precipitation Performance of Regeneration Magnesium Oxide in the Separation of Valuable Components in Laterite Solution

  • 期刊论文

  • 发表日期：

    2025年9月25日

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  • Zhihe Cao,
  • Ding Zhao,
  • Baozhong Ma,
  • Yubo Liu,
  • Chengyan Wang,
  • Yongqiang Chen

摘要

The hydrometallurgical process for laterite nickel ore has become an important component of nickel metallurgy. However, efficient recovery of valuable components such as nickel, cobalt, manganese, iron, and aluminum from hydrometallurgical leachate still faces challenges including serious entrainment, low recovery efficiency, and high reagent consumption. This study, based on the nitric acid pressure leaching process, utilized regenerated magnesium oxide as a neutralizing agent to investigate its effects on valuable component entrainment and filtration performance during the precipitation and separation of nickel, cobalt, iron, and aluminum from hydrometallurgical leachates. The influences of temperature, time, and precipitation pH on aluminum precipitation, iron–aluminum coprecipitation, and nickel–cobalt precipitation were studied. Magnesium oxide passivated at 500 °C was used as the precipitant, added in dry powder form. After 2 h of precipitation, aluminum was completely precipitated, with the nickel precipitation efficiency approximately 15–20%, which was lower than the 25% precipitation rate before optimization. Moreover, through material balance calculation of magnesium oxide, it was determined that precipitating aluminum first can minimize magnesium oxide loss.

Graphical Abstract