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<p>Rare earth elements have received widespread attention due to their extensive industrial applications. However, the production process of rare earth generates radioactive waste, which poses a threat to the environment. This article develops a safe, efficient, and convenient method to separate Th(IV), U(VI) from radioactive waste leachate to reduce environmental hazards. Bastnaesite is one of the rare earth minerals with the largest reserves in China. This article analyzes the main chemical components of two different types of radioactive residue leachate from bastnaesite. For the first time, TRPO (a mixture of trialkylphosphine&#xa0;oxides) has been used to simultaneously separate Th(IV) and U(VI) in the leachate. The optimal parameters for the separation were determined, including the leachate acidity, extractant concentration<b>,</b>&#xa0;and equilibration time between the aqueous phase and organic phase in extraction, scrubbing<b>,</b>&#xa0;and stripping processes. Based on the optimal parameters, the stage numbers and phase volumetric ratios were obtained using equations based on mass conservation and McCabe–Thiele diagrams. Furthermore, a counter-current extraction-scrubbing-stripping process was developed for the simultaneous separation of Th(IV) and U(VI) in the leachate. The results show that Th(IV) and U(VI) can be selectively and simultaneously separated in the leachate of radioactive waste residues.</p>

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Simultaneous separation of uranium and thorium from the leachate of Bastnaesite radioactive waste residue by TRPO

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Xiaomin Li,
  • Peng Liu,
  • Meiying Liu,
  • Xupeng Zhi,
  • Xinlong Chen,
  • Yujin Wang,
  • Xiaoqi Sun,
  • Yinglin Shen

摘要

Rare earth elements have received widespread attention due to their extensive industrial applications. However, the production process of rare earth generates radioactive waste, which poses a threat to the environment. This article develops a safe, efficient, and convenient method to separate Th(IV), U(VI) from radioactive waste leachate to reduce environmental hazards. Bastnaesite is one of the rare earth minerals with the largest reserves in China. This article analyzes the main chemical components of two different types of radioactive residue leachate from bastnaesite. For the first time, TRPO (a mixture of trialkylphosphine oxides) has been used to simultaneously separate Th(IV) and U(VI) in the leachate. The optimal parameters for the separation were determined, including the leachate acidity, extractant concentration, and equilibration time between the aqueous phase and organic phase in extraction, scrubbing, and stripping processes. Based on the optimal parameters, the stage numbers and phase volumetric ratios were obtained using equations based on mass conservation and McCabe–Thiele diagrams. Furthermore, a counter-current extraction-scrubbing-stripping process was developed for the simultaneous separation of Th(IV) and U(VI) in the leachate. The results show that Th(IV) and U(VI) can be selectively and simultaneously separated in the leachate of radioactive waste residues.