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Improved uranium leaching efficiency from low-permeability sandstone using low-frequency vibration in the CO_(2)+O_(2) leaching process

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第3期14卷 770-780页

作者： Yong Zhao Yong Gao Caiwu Luo Jun Liu School of Resource Environment and Safety Engineering University of South ChinaHengyang421001China Department of Nuclear Safety China Institute of Atomic EnergyBeijing100000China College of Humanities and Foreign Languages Xi’an University of Science and TechnologyXi’an710054China China Coal Technology Engineering Group Chongqing Research Institute Chongqing 400039China

Extraction of uranium from low-permeability sandstone is a long-standing challenge in mining.The improvement of sandstone permeability has therefore become a key research focus to improve the uranium leaching effect.To address the low-permeability problem and corresponding leaching limits,leaching experiments are performed using newly developed equipment that could apply low-frequency vibration to the sandstone samples.The test results indicate that low-frequency vibration significantly improves the uranium leaching performance and permeability of the sandstone samples.The leaching effect of low-frequency vibration treatment is approximately nine times more effective than ultrasonic vibration treatment,whereas the concentration of uranium ions generated without vibration treatment is not detectable.Mathematical model that considers the combined action of physico-mechanical vibration and chemical erosion is established to describe the effect of low-frequency vibration on the permeability.The calculated results are in good agreement with the tested permeability values.This study thus offers a new method to effectively leach more uranium from low-permeability sandstone using CO_(2)+O_(2)and provides an insight into the impact of low-frequency vibration on the uranium leaching process.

关键词： Uranium leaching Low-frequency vibration chemical erosion Low permeability Permeability model

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erosion research of CX-2002U carbon composites under low-temperature high-flux hydrogen plasma

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Plasma Science and Technology 2021年第2期23卷 93-100页

作者：郭恒鑫叶宗标沈必舟韦建军王博罗玉川张坤芶富均陈建军陈波 Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610064People's Republic of China Institute of Nuclear Science and Technology Sichuan UniversityChengdu 610064People's Republic of China

The net erosion yield of CX-2002U carbon fiber composites under high-flux low-temperature hydrogen plasma is investigated using a linear plasma device.It is found that the net erosion yield decreases rapidly first,and then tends to saturate with the increase of hydrogen–plasma flux.When the temperature of the sample eroded by hydrogen plasma is above 300°C,the hybridization of electrons outside the carbon atom would change.Then the carbon atoms combine with hydrogen atoms to form massive spherical nanoparticles of hydrocarbon compounds and deposit on the surface at the flux condition of 1.77×10^(22) m^(−2)·s^(−1).Under the irradiation of hydrogen plasma loaded with negative bias,the surface morphology of the matrix carbon is changed dramatically.Moreover,the energy dependence of mass loss does not increase in proportion to the increase of hydrogen–plasma energy,but reaches a peak around 20 V negative bias voltage.Based on the analysis of different samples,it can be concluded that the enhancement of energy could make a contribution to chemical erosion and enlarge the size of pores existing on the surface.

关键词： carbon fiber composites hydrogen plasma chemical erosion redeposition nanoparticle

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