Fractal kinetic characteristics of uranium leaching from low permeability uranium-bearing sandstone

Sheng Zeng; Yuan Shen; Bing Sun; Kaixuan Tan; Shuwen Zhang; Wenhao Ye

doi:https://doi.org/10.1016/j.net.2021.10.013

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자료유형: 학술저널

저자정보: Sheng Zeng (School of Resources Environment and Safety Engineering, University of South China,) Yuan Shen (School of Resources Environment and Safety Engineering, University of South China,) Bing Sun (Civil Engineering College, University of South China, Hengyang) Kaixuan Tan (School of Resources Environment and Safety Engineering, University of South China,) Shuwen Zhang (School of Resources Environment and Safety Engineering, University of South China,) Wenhao Ye (School of Resources Environment and Safety Engineering, University of South China,)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제54권 제4호

발행연도: 2022.4

수록면: 1,175 - 1,184 (10page)

DOI: https://doi.org/10.1016/j.net.2021.10.013

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The pore structure of uranium-bearing sandstone is one of the critical factors that affect the uraniumleaching performance. In this article, uranium-bearing sandstone from the Yili Basin, Xinjiang, China, wastaken as the research object. The fractal characteristics of the pore structure of the uranium-bearingsandstone were studied using mercury intrusion experiments and fractal theory, and the fractaldimension of the uranium-bearing sandstone was calculated. In addition, the effect of the fractal characteristics of the pore structure of the uranium-bearing sandstone on the uranium leaching kinetics wasstudied. Then, the kinetics was analyzed using a shrinking nuclear model, and it was determined that therate of uranium leaching is mainly controlled by the diffusion reaction, and the dissolution rate constant(K) is linearly related to the pore specific surface fractal dimension (DS) and the pore volume fractaldimension (DV). Eventually, fractal kinetic models for predicting the in-situ leaching kinetics wereestablished using the unreacted shrinking core model, and the linear relationship between the fractaldimension of the sample's pore structure and the dissolution rate during the leaching was fitted.

#In-situ leaching #Uranium mine #Pore structure #Fractal characteristics #Leaching kinetics

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