Nuclear Engineering and Technology

  • 제53권12호
  • /
  • Pages.4033-4041
  • /
  • 2021
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  • 1738-5733(pISSN)
  • /
  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Pore structure evolution characteristics of sandstone uranium ore during acid leaching

  • Zeng, Sheng (School of Resources Environment and Safety Engineering, University of South China) ;
  • Shen, Yuan (School of Resources Environment and Safety Engineering, University of South China) ;
  • Sun, Bing (Civil Engineering College, University of South China) ;
  • Zhang, Ni (School of Resources Environment and Safety Engineering, University of South China) ;
  • Zhang, Shuwen (School of Resources Environment and Safety Engineering, University of South China) ;
  • Feng, Song (Hunan Nonferrous Metals Vocational and Technical College)
  • 투고 : 2021.03.12
  • 심사 : 2021.06.07
  • 발행 : 2021.12.25
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초록

To better understand the permeability of uranium sandstone, improve the leaching rate of uranium, and explore the change law of pore structure characteristics and blocking mechanism during leaching, we systematically analyzed the microstructure of acid-leaching uranium sandstone. We investigated the variable rules of pore structure characteristics based on nuclear magnetic resonance (NMR). The results showed the following: (1) The uranium concentration change followed the exponential law during uranium deposits acid leaching. After 24 h, the uranium leaching rate reached 50%. The uranium leaching slowed gradually over the next 4 days. (2) Combined with the regularity of porosity variation, Stages I and II included chemical plugging controlled by surface reaction. Stage I was the major completion phase of uranium displacement with saturation precipitation of calcium sulfate. Stage II mainly precipitated iron (III) oxide-hydroxide and aluminum hydroxide. Stage III involved physical clogging controlled by diffusion. (3) In the three stages of leaching, the permeability of the leaching solution changed with the pore structure, which first decreased, then increased, and then decreased.

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과제정보

This study was supported by the National Natural Science Foundation of China (Grant No. 11775107) and the Key Projects of Education Department of Hunan Province of China (Grant No. 16A184).

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