LiCl-KCl-GaCl_(3)熔盐体系共沉积提取Sm的电化学  

Extraction of Sm by Co-Deposition Method in LiCl-KCl-GaCl_(3)Molten Salt System

作　　者：张金宇 林如山[1] 王有群[2] 张磊[1] ZHANG Jin-yu;LIN Ru-shan;WANG You-qun;ZHANG Lei(China Institute of Atomic Energy,P.O.Box 275(26),Beijing 102413,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China)

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413 [2]东华理工大学核资源与环境国家重点实验室,江西南昌330013

出　　处：《核化学与放射化学》2023年第3期201-208,I0002,共9页Journal of Nuclear and Radiochemistry

摘　　要：采用循环伏安法(CV)、方波伏安法(SWV)和开路计时电位法(OCP)等方法研究了LiCl-KCl熔盐中SmCl_(3)、GaCl_(3)和SmCl_(3)-GaCl_(3)在Mo阴极上的电化学行为。SmCl_(3)在Mo阴极上的电化学研究结果表明,Sm^(3+)在LiCl-KCl熔盐体系中发生单电子转移反应,仅能还原为Sm^(2+);并计算了不同温度下Sm^(3+)的扩散系数和Sm^(3+)/Sm^(2+)电对的表观标准电位。SmCl_(3)与GaCl_(3)共沉积电化学分析结果表明,Sm^(3+)还原为Sm^(2+)后,可与Ga形成SmGa_(x)合金化合物。X射线衍射和扫描电子显微镜与能谱分析(SEM-EDS)表明-1.600 V恒电位电解LiCl-KCl-SmCl_(3)-GaCl_(3)可得到SmGa_(2)合金。以上研究表明,加入GaCl_(3)可从LiCl-KCl-SmCl_(3)熔盐体系中有效提取Sm。The electrochemical behaviors of SmCl_(3)and SmCl_(3)-GaCl_(3)on Mo cathode in LiCl-KCl molten salt were studied by cyclic voltammetry(CV),square wave voltammetry(SWV),and open circuit chronopotentiometry(OCP).The electrochemical results of SmCl_(3)on Mo cathode show that Sm^(3+)undergoes a single electron transfer reaction in the LiCl-KCl molten salt system,and can only be reduced to Sm^(2+).The diffusion coefficient of Sm 3+and apparent standard potential of Sm^(3+)/Sm^(2+)at different temperatures were calculated.The co-deposition of SmCl_(3)and GaCl_(3)results indicate that Sm and Ga can form SmGa x alloys.The phase of SmGa_(2) that is obtained by electrolyzing of LiCl-KCl-SmCl_(3)-GaCl_(3)at-1.600 V is confirmed by XRD and SEM&EDS.The results above reveal that on the addition of GaCl_(3),Sm can be effectively extracted from the LiCl-KCl molten salt system.

关 键 词：SM 共沉积 电化学行为 熔盐 干法后处理 

分 类 号：TL241.2[核科学技术—核燃料循环与材料]