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<p>In this study, a self-designed glass column electrolysis experimental device was adopted, and under the optimized process conditions (i.e., temperature = 318 K, potential gradient = 0.5 V/cm, magnesium sulfate concentration = 0.05 mol/L), the experimental results showed that the rare earth leaching rate reached the peak value. This study derived and established a leaching kinetics model for rare earths and aluminum from weathered crust elution-deposited rare earth ores under electric field. Kinetic analysis showed that the activation energies of rare earths and aluminum during magnesium sulfate electrokinetically enhanced leaching with magnesium sulfate were 9.42 kJ/mol and 14.32 kJ/mol. The reaction order for rare earths was 0.9229, while that for aluminum was 0.7161. The speciation and concentration of major rare earth elements in the solution were analyzed and simulated using Visual MINTEQ software. Systematic simulation and quantitative analysis were conducted on the occurrence speciation and concentration distribution of major rare earth elements in the system through the same software. Combined with the data from electric-field assisted leaching experiments , the experimental&#xa0;results showed that the negatively charged rare earth complexes in the system can achieve directional migration driven by electroosmotic flow, and realize efficient enrichment and collection in the cathode region. Systematic characterization of the phase composition and element distribution of the deposits on the surface of the cathode plate was carried out using the combined technology of scanning electron microscopy and energy-dispersive spectroscopy (SEM–EDS). The results showed that the white precipitates deposited on the cathode surface were rich in magnesium and aluminum ions, and this characteristic directly revealed that the electric-field assisted leaching system has a significant directional removal efficiency for impurity aluminum ions.</p>

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Leaching kinetic mechanism of weathered crust elution-deposited rare earth ore with electric mining

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Zhuo Chen,
  • Yang Long,
  • Ruan Chi,
  • Zhenyue Zhang

摘要

In this study, a self-designed glass column electrolysis experimental device was adopted, and under the optimized process conditions (i.e., temperature = 318 K, potential gradient = 0.5 V/cm, magnesium sulfate concentration = 0.05 mol/L), the experimental results showed that the rare earth leaching rate reached the peak value. This study derived and established a leaching kinetics model for rare earths and aluminum from weathered crust elution-deposited rare earth ores under electric field. Kinetic analysis showed that the activation energies of rare earths and aluminum during magnesium sulfate electrokinetically enhanced leaching with magnesium sulfate were 9.42 kJ/mol and 14.32 kJ/mol. The reaction order for rare earths was 0.9229, while that for aluminum was 0.7161. The speciation and concentration of major rare earth elements in the solution were analyzed and simulated using Visual MINTEQ software. Systematic simulation and quantitative analysis were conducted on the occurrence speciation and concentration distribution of major rare earth elements in the system through the same software. Combined with the data from electric-field assisted leaching experiments , the experimental results showed that the negatively charged rare earth complexes in the system can achieve directional migration driven by electroosmotic flow, and realize efficient enrichment and collection in the cathode region. Systematic characterization of the phase composition and element distribution of the deposits on the surface of the cathode plate was carried out using the combined technology of scanning electron microscopy and energy-dispersive spectroscopy (SEM–EDS). The results showed that the white precipitates deposited on the cathode surface were rich in magnesium and aluminum ions, and this characteristic directly revealed that the electric-field assisted leaching system has a significant directional removal efficiency for impurity aluminum ions.