Separation of NdF<sub>3</sub> using precipitation-distillation coupled method in FLiNaK molten salt

Dandan HUANG; Yunpeng JIA; Zihao WANG; Junxia GENG; Yang YANG; Qiang DOU; Qingnuan LI; Haiying FU; Jinhua WANG

doi:10.11889/j.0253-3219.2017.hjs.40.010603

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Separation of NdF₃ using precipitation-distillation coupled method in FLiNaK molten salt

NUCLEAR ENERGY SCIENCE AND ENGINEERING | 更新时间：2021-05-19

- Separation of NdF₃ using precipitation-distillation coupled method in FLiNaK molten salt
- NUCLEAR TECHNIQUES Vol. 40, Issue 1, Article number: 010603(2017)
- 作者机构：
  
  1.上海大学上海 200444
  2.中国科学院上海应用物理研究所嘉定园区上海 201800
- 作者简介：
- 基金信息：
  
  Supported by Strategic Priority Program of Chinese Academy of Sciences
- DOI：10.11889/j.0253-3219.2017.hjs.40.010603
  CLC： TL426;TL241.2+2
- Received：26 September 2016，
  
  Revised：28 November 2016，
  
  Published：2017-01
- 稿件说明：
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Dandan HUANG, Yunpeng JIA, Zihao WANG, et al. Separation of NdF₃ using precipitation-distillation coupled method in FLiNaK molten salt[J]. Nuclear techniques, 2017, 40(1): 010603
DOI：

Dandan HUANG, Yunpeng JIA, Zihao WANG, et al. Separation of NdF₃ using precipitation-distillation coupled method in FLiNaK molten salt[J]. Nuclear techniques, 2017, 40(1): 010603 DOI： 10.11889/j.0253-3219.2017.hjs.40.010603.

摘要

利用氧化物沉淀-减压蒸馏耦合法研究FLiNaK熔盐体系中氟化物的蒸发行为及稀土Nd的分离。高温下氧化物CaO与稀土氟化物NdF

反应形成难溶于熔盐的稀土氧化物，通过减压蒸馏蒸发、收集冷凝FLiNaK熔盐，提高稀土与熔盐的分离度，促进熔盐的回收利用。研究表明，含有NdF

（

=3%）的FLiNaK熔盐中加入CaO，730℃下反应6 h，

（NdF

）：

（CaO）=1：3时NdF

的转化率达95%。X射线衍射（X-ray Diffraction，XRD）分析表明生成的Nd

主要沉淀在熔盐的底部。经730℃高温沉淀、930℃熔盐蒸馏，冷凝盐中稀土Nd的去污因子达9.4×10

，而未经沉淀处理Nd的去污因子为3.1×10

，表明高温沉淀蒸馏耦合法使稀土NdF

转化为氧化物Nd

，显著增大稀土与FLiNaK的分离度，提高收集盐的纯度。

Abstract

Background:

Low pressure distillation is a promising technology for the recovery and purification of carrier salts (LiF-BeF

) in the thorium based molten salt reactors (TMSR).

Purpose:

This study aims to compare the separation behavior of NdF

before and after adding the oxidant CaO in FLiNaK molten salt.

Methods:

Precipitation-distillation coupled method was employed in purification of molten salt. Then the X-ray Diffractio

(XRD) was applied to the analysis of the produced NdF

in the molten salt.

Results:

At high temperature

CaO was confirmed to react with NdF

and form rare earth oxide Nd

insoluble in molten salt. At 730℃

the conversion rate for Nd was up to 95%. After the precipitation reaction

the separation rate under low pressure distillation was compared with the preceding one. The decontamination factor of Nd was deduced to 9.4×10

whilst the value was 3.1×10

without adding CaO. Meanwhile

the evaporation rate also was improved after precipitation.

Conclusion:

The combination of the precipitation and distillation treatment is an effective way to achieve the high throughput performance in the salt separation process.

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Keywords

references

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Related Institution

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Separation of NdF3 using precipitation-distillation coupled method in FLiNaK molten salt

DOI：10.11889/j.0253-3219.2017.hjs.40.010603

摘要

Abstract

关键词

Keywords

references

Separation of NdF₃ using precipitation-distillation coupled method in FLiNaK molten salt