Evaporation and separation of CsF in FLiNaK molten salt

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Evaporation and separation of CsF in FLiNaK molten salt

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- Evaporation and separation of CsF in FLiNaK molten salt
- NUCLEAR TECHNIQUES Vol. 39, Issue 2, Article number: 020602(2016)
- 作者机构：
  
  1.中国科学院上海应用物理研究所嘉定园区上海 201800;
  2.中国科学院大学北京 100049
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2016.hjs.39.020602
  CLC： TL426;TL241.2+2
- Received：18 September 2015，
  
  Accepted：2016-01-04，
  
  Published：25 January 2016
- 稿件说明：
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Yunpeng JIA, Zihao WANG, Junxia GENG, et al. Evaporation and separation of CsF in FLiNaK molten salt[J]. Nuclear techniques, 2016, 39(2): 020602
DOI：

Yunpeng JIA, Zihao WANG, Junxia GENG, et al. Evaporation and separation of CsF in FLiNaK molten salt[J]. Nuclear techniques, 2016, 39(2): 020602 DOI： 10.11889/j.0253-3219.2016.hjs.39.020602.

摘要

Cs的同位素是核裂变的主要产物之一

在熔盐反应堆液态燃料盐中以CsF的化学形态存在

定期从燃料盐中除去或减少其含量将有助于提高反应堆的中子经济性。本文用FLiNaK熔盐模拟熔盐堆载体盐FLiBe体系

研究了CsF在不同蒸发条件下的蒸发行为

并尝试进行了减压蒸馏和金属Li还原蒸发技术分离CsF的实验研究。研究表明

在5 Pa蒸馏压力下

CsF的蒸发量随温度呈线性上升趋势

780℃时CsF的含量由1%降到0.14%

分离率达86%

但此时载体盐的蒸发量达9.5%;在常压、700℃条件下

熔盐中CsF的蒸发比例随还原剂Li的添加量而提高

当添加的金属Li的摩尔浓度与CsF为120:1时

CsF分离率达91%。研究结果为了解CsF在氟盐体系中的蒸发行为和建立可行的分离方法提供基础实验依据。

Abstract

Background:

2

The removal of CsF

a major fission product in molten salt reactor

on a regular basis is helpful for the improvement of neutron economy of the reactor.

Purpose:

2

This study aims to investigate the evaporation behavior of CsF under different experimental conditions in FLiNaK molten salt.

Methods:

2

Two different evaporation methods

namely vacuum distillation and reductive evaporation by metal lithium

were employed in this work.

Results:

2

The results from the experiments of v

acuum distillation at 5 Pa revealed a linear correlation between evaporated mass of CsF and evaporation temperature. At 780℃

the CsF concentration in molten salt decreased from 1% to 0.14% upon distillation with a separation rate of 86% despite the loss of 9.5% of the carrier salt. Reductive evaporation by metal lithium was carried out at 700℃ and 1.01×10

5

Pa. The amount of evaporated CsF increased with the increase of lithium added into the molten salt. The separation rate was 91% at a molar ratio of lithium to CsF of 120.

Conclusion:

2

Fundamental data are provided to understand the evaporation behaviors of CsF in fluoride molten salt

which could further benefit the establishment of efficient separation technique for CsF removal from spent fuel.

关键词

Keywords

references

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