镧锕分离用BTPs/离子液体萃取体系的辐射效应研究

项目名称： 镧锕分离用BTPs/离子液体萃取体系的辐射效应研究

项目编号： No.11475112

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 赵龙

作者单位： 湖北科技学院

项目金额： 98万元

中文摘要： 为了实现次锕系元素（MA）的有效嬗变，有必要进行MA/镧系（Ln）分离。目前已发展出BTPs 这样在MA/Ln相互分离工艺中有不俗表现的萃取剂，但它们在有机溶剂萃取体系中仍存在很多问题。离子液体因其低挥发性，高热稳定性，被认为是分离放射性核素的新一代绿色溶剂。BTPs/离子液体组成的新型萃取体系有望克服有机溶剂体系的诸多缺点，更好地实现MA/Ln分离。然而由于乏燃料后处理的强辐射性，有必要研究BTPs在离子液体萃取体中的辐射稳定性。本项目拟开展BTPs在离子液体萃取体系中的辐射化学研究，考察其在不同体系及不同射线，包括α，β，γ辐照下的辐解产物、辐解机理及辐解动力学，并结合次锕系元素的萃取分离机理，在分子水平上阐明不同射线辐照对萃取分离影响的原因。预期从辐射化学角度对BTPs/离子液体萃取分离体系能否适用于乏燃料后处理给出参考意见，为选择设计耐辐射性良好的新型分离体系提供理论和实验依据。

中文关键词： 辐射效应；BTPs；离子液体；萃取体系；镧锕分离

英文摘要： The effective partitioning of minor actinides (MA) from high level liquid waste isone of key steps to realize the advanced nuclear fuel cycle based on Partitioning and Transmutation. BTPs including R-BTP (2,6-bis(5,6-dialkyl-1,2,4-triazine-3-yl) pyridine (R-BTP, R: alkyl group)) and R-BTBP (6,6'-bis- (5,6-dialkyl-[1,2,4]triazin-3-yl)-2,2'-bipyridyl) are effective extractants for minor actinides separation in current organic solvent extracting system. Compared to organic solvent extracting system, the new ionic liquids extracting system is believed to show greater promise for partitioning of minor actinides (MA) from high level liquid waste. However, due to the high radioactive environment of spent fuel reprocessing, the radiation stability of extractants in the new extracting system should be investigated before their practical application. In this project, the radiation chemistry behavior of the extractants ( BTPs) used in new ionic liquids extracting system will be studied in detail. The influents of radiation conditions and presence of HNO3 will be investigated, and the radiolysis products will be analyzed. Furthermore, the radiolysis mechanism and radiation chemistry kinetics will be discussed. The influence of irradiation on the extracting capacity will also be measured, and the possible method for reduction against the radiation damage will also be proposed. α，β，γ, three kinds of irradiation will be applied in this research. This research will be expected to obtain good understanding of radiation effects on above mentioned BTPs extractants used in ionic liquids extracting system. Some important experimental data and theory obtained in current work will help us developing appropriate reprocessing technologies.

英文关键词： radiation effect;BTPs;Ionic liquids;extracting system;separation of Ln/An