Pore structure evolution characteristics of sandstone uranium ore during acid leaching

Sheng Zeng; Yuan Shen; Bing Sun; Ni Zhang; Shuwen Zhang; Song Feng

doi:https://doi.org/10.1016/j.net.2021.06.011

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자료유형: 학술저널

저자정보: Sheng Zeng (University of South China) Yuan Shen (University of South China) Bing Sun (University of South China) Ni Zhang (University of South China) Shuwen Zhang (University of South China) Song Feng (Hunan Nonferrous Metals Vocational and Technical College)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제53권 제12호

발행연도: 2021.12

수록면: 4,033 - 4,041 (9page)

DOI: https://doi.org/10.1016/j.net.2021.06.011

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

#In situ leaching #Sandstone uranium ore #Acid method #Nuclear magnetic resonance #Pore characteristic

참고문헌 (41)

참고문헌 신청

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In Situ Leach / 2014 / Mining of Uranium / World Nuclear Association

M. N. Alkheder / 2020 / A study OF uranium and P2O5transfer IN SYRIAN phosphate leaching BY commercial nitric and hydrochloric acids / J. Journal of Chemical Technology and Metallurgy 55(4)

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