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Estimating Radon Flux and Environmental Radiation Dose from Decommisioning uranium mill tailings and Mining Debris

Journal of Earth Science 1998年第3期17卷 68-72页

作者： Xu Lechang Research Institute of uranium Mining, CNNC, Hengyang 421001 Wang Yanxin Faculty of Engineering, China University of Geosciences, Wuhan 430074 Dai Xingye Mine No.765, CNNC, Lincang 677009

Based on a case study on uranium mine No.765 of China National Nuclear Corporation (CNNC), the paper briefly describes disposal program and effect of decommissioning uranium mine/mill facilities and quantitatively evaluates radon fluxes and doses to man of gaseous airborne pathway from mill tailings and mining debris before and after decommissioning, including annual individual effective dose to critical groups and annual collective effective dose to the population within 80 km region of the facilities.

关键词： uranium mill tailings uranium mining debris radon flux dose.

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uranium sorption on oxyhydroxide minerals by surface complexation and precipitation

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Chinese Chemical Letters 2022年第7期33卷 3461-3467页

作者： Jingyi Wang Wanqiang Zhou Yanlin Shi Yao Li Dongfan Xian Ning Guo Chunli Liu Beijing National Laboratory for Molecular Sciences Fundamental Science Laboratory on Radiochemistry and Radiation ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

During the chemical weathering of the uranium mill tailings,released uranium could be immobilized by the newly formed secondary minerals such as oxyhydroxides.A deeper understanding of the interaction between uranium and common oxyhydroxides under environmental conditions is *** this work,uranium sorption behaviors on Al-,Mn-and Fe-oxyhydroxide minerals(boehmite,manganite,goethite,and lepidocrocite)were investigated by batch *** showed that the uranium sorption on Al-oxyhydroxide behaved significantly differently from the other three *** sorption edge of the Mn-and Fe-oxyhydroxides located around pH 5,while the sorption edge of boehmite shifted about 1.5 pH unit to near *** sorption isotherms of uranium on manganite,goethite and lepidocrocite at pH 5.0 could be well fitted by the Langmuir *** of surface complexation,sorption on boehmite happened mainly by uranium-bearing carbonates and hydroxides precipitation as illustrated by the characterization *** carbonate and phosphate strongly affected the uranium sorption *** removal efficiency of uranium by boehmite exceeded 98%after three sorption-desorption cycles,indicating it may be a potential material for uranium removal and recovery.

关键词： uranium mill tailings Oxyhydroxides uranium sorption Surface complexation Surface precipitation

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