Journal of Radiation Research and Radiation Proces ›› 2018, Vol. 36 ›› Issue (3): 30301-030301.doi: 10.11889/j.1000-3436.2018.rrj.36.030301

• RADIATION CHEMISTRY • Previous Articles     Next Articles

Effect of F- concentration on the electrolysis of Th (IV) in ThF4-LiCl-KCl molten salt

XU Qianhui1,2,3, ZHU Tiejian1,3, ZHENG Haiyang1,3, JIANG Feng1,3, SHE Changfeng1,3, HUANG Wei1,3, LI Qingnuan1,3   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
    2. University of China Academy of Sciences, Beijing 100049, China;
    3. Center of Excellence TMSR Energy System, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2018-03-28 Revised:2018-04-18 Online:2018-06-20 Published:2018-06-21
  • Supported by:

    Supported by Strategic Science and Technology Pilot Project of Chinese Academy of Sciences (No.XDA02030000), National Natural Science Foundation of China (21601200), Frontier Science Key Research Project of Chinese Academy of Sciences (QYZDY-SSW-JSC016), and Youth Innovation Promotion Association, Chinese Academy of Sciences (2017307)

Abstract:

The ratio of[F-]/[Th(IV)] in the ThF4-LiCl-KCl molten salt system was adjusted by adding LiF and KF. The ratio of[F-]/[Th(IV)] reflected the concentration of F- in the molten salt. The effect of F- concentration on the electrolysis recycling rate of Th(IV) was examined. The recycling rate of Th(IV) decreased with increasing ratios of[F-]/[Th(IV)] from 4 to 12, indicating that increased F- concentration in the molten salt affected the precipitation of Th(IV) on the electrode. Chronopotentiometry was used to determine the diffusion coefficient of Th(IV) in the LiCl-KCl molten salt with different[F-]/[Th(IV)] ratios. The diffusion coefficient of Th(IV) initially decreased and subsequently increased, and a turning point was observed at a[F-]/[Th(IV)] ratio of 8. However, due to the increased F-concentration, the current density in the electrolysis process of Th(IV) was significantly reduced, resulting in a decreased recycling rate of Th(IV).

Key words: ThF4, LiCl-KCl, Electrochemical recycling, [F-]/[Th (IV)]molar ratio

CLC Number: 

  • O615