Effect of F<sup>-</sup> concentration on the electrolysis of Th (IV) in ThF<sub>4</sub>-LiCl-KCl molten salt

Qianhui XU; Tiejian ZHU; Haiyang ZHENG; Feng JIANG; Changfeng SHE; Wei HUANG; Qingnuan LI

doi:10.11889/j.1000-3436.2018.rrj.36.030301

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

RADIATION CHEMISTRY | 更新时间：2021-12-10

- Effect of F^- concentration on the electrolysis of Th (IV) in ThF₄-LiCl-KCl molten salt
- Journal of Radiation Research and Radiation Processing Vol. 36, Issue 3, (2018)
- 作者机构：
  
  1.中国科学院上海应用物理研究所上海 201800
  2.中国科学院大学北京 100049
  3.中国科学院先进核能创新研究院上海 201800
- 作者简介：
- 基金信息：
  
  Strategic Science and Technology Pilot Project of Chinese Academy of Sciences(XDA02030000);National Natural Science Foundation of China(21601200);Frontier Science Key Research Project of Chinese Academy of Sciences(QYZDY-SSW-JSC016);Youth Innovation Promotion Association, Chinese Academy of Sciences(2017307)
- DOI：10.11889/j.1000-3436.2018.rrj.36.030301
  CLC：
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Qianhui XU, Tiejian ZHU, Haiyang ZHENG, et al. Effect of F^- concentration on the electrolysis of Th (IV) in ThF₄-LiCl-KCl molten salt. [J]. Journal of Radiation Research and Radiation Processing 36(3):030301-8(2018)
DOI：

Qianhui XU, Tiejian ZHU, Haiyang ZHENG, et al. Effect of F^- concentration on the electrolysis of Th (IV) in ThF₄-LiCl-KCl molten salt. [J]. Journal of Radiation Research and Radiation Processing 36(3):030301-8(2018) DOI： 10.11889/j.1000-3436.2018.rrj.36.030301.

摘要

通过添加LiF和KF调节ThF,4,-LiCl-KCl熔盐体系中的[F,-,]/[Th（IV）],比值，并以[F,-,]/[Th（IV）],比值代表熔盐中F,-,浓度大小，研究了F,-,浓度对Th（IV）电解提取率的影响。研究结果表明，在[F,-,]/[Th（IV）],比值为4～12时，Th的提取率呈下降趋势，熔盐中F,-,浓度的增加对Th在电极上的析出产生消极影响。用计时电势法研究了不同[F,-,]/[Th（IV）],比值熔盐体系中Th（IV）的扩散系数，发现[F,-,]/[Th（IV）],比值在4～12时，Th（IV）的扩散系数呈现先减小后增加的趋势，在[F,-,]/[Th（IV）],比值为8时出现一个拐点；但由于F,-,浓度的增加显著降低了Th（IV）电解过程的电流密度，最终导致相同电解时间内Th的提取率呈下降趋势。

Abstract

The ratio of[F,-,]/[Th(IV)], in the ThF,4,-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).

关键词

ThF4LiCl-KCl电化学提取[F-]/[Th (IV)]物质的量比

Keywords

ThF4LiCl-KClElectrochemical recycling[F-]/[Th (IV)]molar ratio

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

DOI：10.11889/j.1000-3436.2018.rrj.36.030301

摘要

Abstract

关键词

Keywords

references

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