The influence of fluorides on the distillation behaviors of molten LiCl-KCl

Tianhong YANG; Yan LUO; Haiying FU; Yu GONG

doi:10.11889/j.0253-3219.2018.hjs.41.120301

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The influence of fluorides on the distillation behaviors of molten LiCl-KCl

NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE | 更新时间：2021-05-19

- The influence of fluorides on the distillation behaviors of molten LiCl-KCl
- NUCLEAR TECHNIQUES Vol. 41, Issue 12, Article number: 120301(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
- 作者简介：
- 基金信息：
  
  the Strategic Pilot Science and Technology Project of Chinese Academy of Sciences;the Frontier Science Key Program of Chinese Academy of Sciences;National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2018.hjs.41.120301
  CLC： TL426;TL241.22
- Received：20 September 2018，
  
  Revised：10 October 2018，
  
  Published：10 December 2018
- 稿件说明：
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Tianhong YANG, Yan LUO, Haiying FU, et al. The influence of fluorides on the distillation behaviors of molten LiCl-KCl[J]. Nuclear techniques, 2018, 41(12): 120301
DOI：

Tianhong YANG, Yan LUO, Haiying FU, et al. The influence of fluorides on the distillation behaviors of molten LiCl-KCl[J]. Nuclear techniques, 2018, 41(12): 120301 DOI： 10.11889/j.0253-3219.2018.hjs.41.120301.

摘要

从含有裂变产物氟化物的氯化物熔盐中分离回收载体盐，对锕系元素和裂变产物氟化物电解分离技术的研发有着重要意义。本文以含有稀土、碱土金属和锆氟化物的LiCl-KCl盐为对象，在1050 K、130 Pa的条件下，研究了氟化物种类和蒸发比例对LiCl-KCl熔盐减压蒸馏行为的影响。结果表明：随着蒸发比例的增大，5% CeF

-LiCl-KCl混合盐蒸馏后得到的收集盐中Ce的去污系数逐渐减小。对于含有CeF

、NdF

、LaF

、SrF

等氟化物的LiCl-KCl盐，蒸发比例为95%时，对应收集盐中金属元素的去污系数基本维持在10

数量级。当混合盐含有EuF

或ZrF

时，金属元素的去污系数相比于其他元素明显偏低，前者主要是由于相对易挥发EuF

的存在，而后者是由于ZrF

较高的蒸气压所致。CeF

-LiCl-KCl蒸发收集盐的分析结果显示，蒸馏后得到的LiCl-KCl盐组成与原料盐一致，氟含量较低，能满足回收再利用的要求。

Abstract

Background

Recycling the chloride salt from the fission product fluoride and chloride salt mixture is important to the research and development of electrolytic separation technology for actinides and fission products fluoride. Low pressure distillation is a powerful technique

but the experimental data on the distillation behaviors of fluoride doped chloride salts are limited.

Purpose

This study aims at the experimental results which provide a basic understanding on the behaviors of fluoride doped molten chlorides during low pressure distillation.

Methods

The distillation behaviors of various fluoride doped molten chlorides at 1050 K and 130 Pa were studied in a pipe furnace. Salt vapor was condensed and collected on stainless steel foil 5 cm away from the crucible.

Results

With the increase of evaporation ratio

the decontamination coefficient of Ce decreases at 1050 K and 130 Pa in the salt collected by 5% CeF

-LiCl-KCl low pressure distillation. For the LiCl-KCl salts containing CeF

NdF

LaF

and SrF

respectively

the corresponding decontamination factors of the collected salts are on the order of 10

at the evaporation ratio of 95%. The decontamination factor of EuF

-LiCl-KCl system is very low

which may due to the presence of more volatile EuF

at 1050 K

while the high vapor pressure of ZrF

is responsible for the low decontamination factor of zirconium in the case of ZrF

-LiCl-KCl.

Conclusion

The distillation behaviors of LiCl-KCl are affected by the nature of fission product fluorides as well as the evaporation ratio of the salt mixtures. The collected chloride salt mixture from low pressure distillation of CeF

-LiCl-KCl has a similar composition with the LiCl-KCl eutectic

and the content of fluoride is low enough.

关键词

Keywords

references

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