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<p>The comprehensive recovery of rare earths and associated resources in Bayan Obo has historically been a prominent area of research interest. However, the existing technologies have not yet achieved full satisfaction. In light of these challenges, this study has undertaken a comprehensive investigation into a clean extraction process for the recovery of resources such as Th, RE, Ca, Fe, and F in Bayan Obo. The investigation utilizes advanced detection methods, including XRD (X-ray Diffraction), SEM (Scanning Electron Microscopy), and chemical analysis. The experimental findings demonstrate that through mineral phase reorganization, the simultaneous conversion of REFCO<sub>3</sub>, REPO<sub>4</sub>, ThPO<sub>4</sub>, CaF<sub>2</sub>, and Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>F into RE<sub>2</sub>O<sub>3</sub>, ThO<sub>2</sub>, Ca(OH)<sub>2</sub>, NaF, Na<sub>3</sub>PO<sub>4</sub>, and Na<sub>2</sub>CO<sub>3</sub> is attainable. The water washing and preferential leaching processes have been demonstrated to achieve leaching rates of P, F, and Ca of over 77.45%, 73.33%, and 75.36%, respectively, thereby facilitating the preferential separation of Ca, F, and P from REEs(Rare Earth Elements). Conversely, through the acid dissolution and impurity removal processes, the leaching rate of rare earths can reach more than 98.12%, and the recovery rates of Fe and Th are both greater than 98%. The resulting iron–thorium slag can be utilized as a high-quality Th-based nuclear fuel. The method is characterized by its simplicity and feasibility, exhibiting a reduced impurity content in the REECl<sub>3</sub> solution, decreased equipment investment, and diminished pollution from waste gas, waste water, and solid waste. The method’s technical and environmental protection advantages are predictable, and it is expected to replace the concentrated sulfuric acid roasting method, which causes relatively serious pollution.</p> Graphical Abstract <p></p>

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Research on Targeted Regulation and Utilization of Bayan Obo Rare Earth and Associated Resources Through Mineral Phase Recombination Technology

  • 期刊论文

  • 发表日期：

    2025年4月4日

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  • Jianfei Li,
  • Xinbo Wang,
  • Xingwang Ye,
  • Xiaowei Zhang,
  • Yanhong Hu,
  • Jinxiu Wu,
  • Feng Guo,
  • Wenbin Xin,
  • Xiaoyan Hao

摘要

The comprehensive recovery of rare earths and associated resources in Bayan Obo has historically been a prominent area of research interest. However, the existing technologies have not yet achieved full satisfaction. In light of these challenges, this study has undertaken a comprehensive investigation into a clean extraction process for the recovery of resources such as Th, RE, Ca, Fe, and F in Bayan Obo. The investigation utilizes advanced detection methods, including XRD (X-ray Diffraction), SEM (Scanning Electron Microscopy), and chemical analysis. The experimental findings demonstrate that through mineral phase reorganization, the simultaneous conversion of REFCO3, REPO4, ThPO4, CaF2, and Ca5(PO4)3F into RE2O3, ThO2, Ca(OH)2, NaF, Na3PO4, and Na2CO3 is attainable. The water washing and preferential leaching processes have been demonstrated to achieve leaching rates of P, F, and Ca of over 77.45%, 73.33%, and 75.36%, respectively, thereby facilitating the preferential separation of Ca, F, and P from REEs(Rare Earth Elements). Conversely, through the acid dissolution and impurity removal processes, the leaching rate of rare earths can reach more than 98.12%, and the recovery rates of Fe and Th are both greater than 98%. The resulting iron–thorium slag can be utilized as a high-quality Th-based nuclear fuel. The method is characterized by its simplicity and feasibility, exhibiting a reduced impurity content in the REECl3 solution, decreased equipment investment, and diminished pollution from waste gas, waste water, and solid waste. The method’s technical and environmental protection advantages are predictable, and it is expected to replace the concentrated sulfuric acid roasting method, which causes relatively serious pollution.

Graphical Abstract