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<p>Rubidium (Rb), as a rare metal with promising applications, requires efficient extraction technologies for sustainable resource development. This study addressed the challenge of complex Rb-K mineralogical structures in granite-type rubidium ores by proposing a synergistic extraction process combining chlorination roasting, water leaching, and solvent extraction. Thermodynamic analysis and experimental optimization revealed that a mixed chlorination agent (CaCl<sub>2</sub> and NaCl) effectively disrupts the crystal structures of microcline and zinnwaldite, converting Rb and K into soluble chlorides. Under optimized roasting conditions (the feed particle size of less than 75 μm accounting for 59.80%, the mass ratio of raw ore/CaCl<sub>2</sub>/NaCl of 1:0.2:0.3, and the roasting temperature of 900 ºC for a duration of 90 min), the leaching efficiencies of Rb and K reached 97.54% and 95.02%, respectively. Subsequent solvent extraction using a 4-tert-butyl-2-(α-methylbenzyl)-phenol (t-BAMBP)/sulfonated kerosene system achieved efficient separation of Rb (98.40%) and K (14.73%) through five-stage countercurrent extraction, yielding high-purity Rb<sub>2</sub>SO<sub>4</sub>.</p> Graphical Abstract <p></p>

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Efficient Extraction and Separation of Rubidium from Rb-Bearing Granite Ore via Roasting Followed by Solvent Extraction

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Xiufeng Zhang,
  • Weizao Liu,
  • Xiumin Tan,
  • Hong Li,
  • Guang Hu,
  • Chen Yang

摘要

Rubidium (Rb), as a rare metal with promising applications, requires efficient extraction technologies for sustainable resource development. This study addressed the challenge of complex Rb-K mineralogical structures in granite-type rubidium ores by proposing a synergistic extraction process combining chlorination roasting, water leaching, and solvent extraction. Thermodynamic analysis and experimental optimization revealed that a mixed chlorination agent (CaCl2 and NaCl) effectively disrupts the crystal structures of microcline and zinnwaldite, converting Rb and K into soluble chlorides. Under optimized roasting conditions (the feed particle size of less than 75 μm accounting for 59.80%, the mass ratio of raw ore/CaCl2/NaCl of 1:0.2:0.3, and the roasting temperature of 900 ºC for a duration of 90 min), the leaching efficiencies of Rb and K reached 97.54% and 95.02%, respectively. Subsequent solvent extraction using a 4-tert-butyl-2-(α-methylbenzyl)-phenol (t-BAMBP)/sulfonated kerosene system achieved efficient separation of Rb (98.40%) and K (14.73%) through five-stage countercurrent extraction, yielding high-purity Rb2SO4.

Graphical Abstract