氟化物对LiCl-KCl熔盐蒸馏行为的影响

杨甜宏; 罗艳; 付海英; 龚昱

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

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氟化物对LiCl-KCl熔盐蒸馏行为的影响

核化学、放射化学、放射性药物和核医学 | 更新时间：2021-05-19

- 氟化物对LiCl-KCl熔盐蒸馏行为的影响
- The influence of fluorides on the distillation behaviors of molten LiCl-KCl
- 核技术 2018年41卷第12期文章编号：120301
- 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：
  
  [ "杨甜宏, 男, 1994年出生, 2016年毕业于湖北科技学院, 现为硕士研究生, 无机化学专业", "YANG Tianhong, male, born in 1994, graduated from Hubei University of Science and Technology in 2016, master student, major in inorganic chemistry" ]
  龚昱, E-mail:gongyu@sinap.ac.cn GONG Yu, E-mail:gongyu@sinap.ac.cn
- 基金信息：
  
  中国科学院战略性先导科技专项(XDA02030000);中国科学院前沿科学重点研究项目(QYZDY-SSWJSC016);国家自然科学基金(21771188)
- DOI：10.11889/j.0253-3219.2018.hjs.41.120301
  中图分类号： TL426;TL241.22
- 收稿日期：2018-09-20，
  
  修回日期：2018-10-10，
  
  纸质出版日期：2018-12-10
- 稿件说明：
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杨甜宏, 罗艳, 付海英, 等. 氟化物对LiCl-KCl熔盐蒸馏行为的影响[J]. 核技术, 2018,41(12):120301

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
杨甜宏, 罗艳, 付海英, 等. 氟化物对LiCl-KCl熔盐蒸馏行为的影响[J]. 核技术, 2018,41(12):120301 DOI： 10.11889/j.0253-3219.2018.hjs.41.120301.

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

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