作者机构：
[王清良; 李乾; 胡鄂明; 李中; 冯志刚] School of Nuclear Resource Engineering, University of South China, Hengyang, China;[成泉辉] No. 6 Smelting Plant, Hunan Shuikoushan Nonferrous Metals Group Co., Ltd., Hengyang, China
通讯机构：
[Feng, Zhi-Gang] U;Univ South China, Sch Nucl Resource Engn, Hengyang 421001, Peoples R China.
关键词：
Chemical analysis;Pollution;Soils;Uranium;Background value;Chemical forms;Pollution sources;Soil profiles;Surrounding soils;Uranium distribution;Uranium pollution;Waste rock dumps;Radioactive wastes;pollutant source;radioactive waste;soil aggregate;soil pollution;uranium;China
摘要：
Five soil profiles were sampled around a uranium waste rock dump in South China, which included two unpolluted and three potentially uranium-polluted profiles. Through the comparison of the uranium distribution characteristics and the analysis of the uranium chemical forms of these profiles, the following conclusions can be drawn: (1) significant uranium pollution to the surrounding soils was caused by the dump, and the average uranium in these soils, such as the profiles WP1, WP2 and WP3, was 633.6, 9 and 2.7 times more enriched than the background value; (2) the exotic uranium, which was preferentially aggregated in the upper layer of the soils near the pollution source, would be gradually precipitated in the lower layer of the soils away from the pollution source; (3) the input flux of the exotic uranium of each chemical form would be larger in the soils closer to the pollution source.
作者机构：
[Zheng Jian; Hu Yang; Wang Xiaoning; Song Jia; Duan Xianzhe; Yang Bifeng; Feng Zhigang] Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Hunan, Peoples R China.;[Hu Yang] Univ South China, Post Doctoral Res Stn Min Engn, Hengyang 421001, Hunan, Peoples R China.;[Hu Yang] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Hunan, Peoples R China.
会议名称：
3rd International Conference on Machinery, Materials Science and Energy Engineering (ICMMSEE)
会议时间：
JUL 18-19, 2015
会议地点：
Wuhan, PEOPLES R CHINA
会议主办单位：
[Duan Xianzhe;Zheng Jian;Wang Xiaoning;Yang Bifeng;Song Jia;Feng Zhigang;Hu Yang] Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Hunan, Peoples R China.^[Hu Yang] Univ South China, Post Doctoral Res Stn Min Engn, Hengyang 421001, Hunan, Peoples R China.^[Hu Yang] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Hunan, Peoples R China.
关键词：
Sandstone-type uranium deposit;Chemical speciation of uranium;Sequential chemical extraction;In-situ Leaching
摘要：
Sequential chemical extraction procedure was modified from Tessier process and demonstrates its application to sandstone uranium exploration. Use it to study uranium speciation with six different samples from in-situ leaching sandstone-type uranium deposits. The chemical speciation of uranium in samples was classified into six speciation: the exchangeable ion, carbonates bound, sulfide-organic matter speciation bound, amorphous Fe-Mn oxides bound, sparry Fe-Mn oxides bound and the residual state. Through the research, the uranium distribution characteristics were significantly different whether they were in different samples or in the same sample. Therefore, the research on chemical speciation of uranium Deposit before the production is essential to reasonable evaluation of Deposit and can guide the technology of in-situ leaching uranium Deposit. It also can rich the mineralization mechanism of sandstone-type uranium Deposit.
摘要：
Six uranium tailings samples from the shallow depth of two large-scale uranium tailings ponds in South China, which were affected by pedogenesis, were analyzed to determine the occurrence modes of uranium. The results demonstrated that an average of nearly 80% of the uranium in the samples was mobile and potentially mobile, indicating that this type of uranium tailings could significantly threaten their ambient environment when their contents of uranium were relatively high. In this sense, the possibility of the in-situ immobilization of active uranium in the uranium tailings was discussed. The experimental data indicated that the active uranium could be immobilized through its reaction with phosphate, which was theoretically feasible and promising in curbing uranium pollution.
作者机构：
[Wangzhengqing; Liushan; Huyang; Xieyanshi; Duanxianzhe; Fengzhigang; Chenliang] Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Hunan, Peoples R China.;[Huyang] Univ South China, Postdoctoral Res Stn Min Engn, Hengyang 421001, Hunan, Peoples R China.;[Huyang] Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Hunan, Peoples R China.;[Jiazhikun] Sinochem Petr Explorat & Prod Co Ltd, Beijing 100031, Peoples R China.
会议名称：
4th International Conference on Energy and Environmental Protection (ICEEP)
会议时间：
JUN 02-04, 2015
会议地点：
Shenzhen, PEOPLES R CHINA
会议主办单位：
[Huyang;Fengzhigang;Xieyanshi;Chenliang;Duanxianzhe;Wangzhengqing;Liushan] Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Hunan, Peoples R China.^[Huyang] Univ South China, Postdoctoral Res Stn Min Engn, Hengyang 421001, Hunan, Peoples R China.^[Huyang] Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Hunan, Peoples R China.^[Jiazhikun] Sinochem Petr Explorat & Prod Co Ltd, Beijing 100031, Peoples R China.
关键词：
sandstone-type uranium deposit;chemical speciation of uranium;sequential chemical extraction;in-situ Leaching
摘要：
This paper presents a method of studying uranium speciation with six different hole depth and numbers from in-situ leaching sandstone-type uranium deposits by a sequential extraction procedure and demonstrates its application to sandstone uranium exploration. The chemical extraction procedure was modified from Tessier. The chemical speciation of uranium in samples was classified into six speciation: exchangeable ions, bound to carbonates, bound to sulfide-organic matter, bound to amorphous Fe-Mn oxides/bound to hydroxide, bound to sparry Fe-Mn oxides/bound to hydroxide and residual speciation. Studying the chemical speciation of uranium by method of sequential extraction show that the uranium distribution characteristics were significantly different whether they were in different samples or in the same sample. Therefore, a research on chemical speciation of Deposit behind the production is essential to reasonable evaluation of Deposit and guide the technology of in-situ leaching uranium Deposit. It also can rich the mineralization mechanism of sandstone-type uranium Deposit. The average amounts of bound to carbonates, exchangeable ions, bound to amorphous Fe-Mn oxides, residual speciation, bound to sulfide-organic matter and bound to sparry Fe-Mn oxides in order as 58.9%, 22.6%, 13.3%, 2.3%, 1.4% and 1.4%.
