Permeability evolution mechanism and the optimum permeability determination of uranium leaching from low-permeability sandstone treated with low-frequency vibration
作者机构：School of Resource Environment and Safety EngineeringUniversity of South ChinaHengyang421001China Department of Nuclear SafetyChina Institute of Atomic EnergyBeijing102413China
出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报(英文版))
年 卷 期：2023年第15卷第10期
页 面：2597-2610页
核心收录：
学科分类：08[工学] 0818[工学-地质资源与地质工程] 082702[工学-核燃料循环与材料] 0805[工学-材料科学与工程（可授工学、理学学位）] 0827[工学-核科学与技术]
基 金：supported by the National Natural Science Foundation of China(Grant No.11705086) the National Science Foundation of Hunan Province,China(Grant No.2018JJ3424) the Foundation of Hunan Educational Committee(Grant No.16C1387)
主 题：Low-frequency vibration Low-permeability sandstone Uranium migration Permeability evolution mechanism Chemical reactive rate Optimum permeability
摘 要：Low-frequency vibrations can effectively improve natural sandstone permeability,and higher vibration frequency is associated with larger ***,the optimum permeability and permeability evolution mechanism for uranium leaching and the relationship between permeability and the change of chemical reactive rate affecting uranium leaching have not been *** solve the above problems,in this study,identical homogeneous sandstone samples were selected to simulate lowpermeability sandstone;a permeability evolution model considering the combined action of vibration stress,pore water pressure,water flow impact force,and chemical erosion was established;and vibration leaching experiments were performed to test the model *** the permeability and chemical reactions were found to simultaneously restrict U6þleaching,and the vibration treatment increased the permeability,causing the U6þleaching reaction to no longer be diffusion-constrained but to be primarily controlled by the reaction *** of the model calculation parameters were further analyzed to determine the permeability evolution mechanism under the influence of vibration and chemical erosion,to prove the correctness of the mechanism according to the experimental results,and to develop a new method for determining the optimum permeability in uranium *** uranium leaching was found to primarily follow a process consisting of(1)a permeability control stage,(2)achieving the optimum permeability,(3)a chemical reactive rate control stage,and(4)a channel flow *** resolution of these problems is of great significance for facilitating the application and promotion of lowfrequency vibration in the CO_(2)+O_(2) leaching process.
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