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FLiNaK熔盐中CsF的蒸发与分离
Evaporation and separation of CsF in FLiNaK molten salt
- 核技术 2016年39卷第2期 文章编号：020602
- 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：
贾昀澎,男,1991年出生,2013年毕业于兰州大学,现为硕士研究生,无机化学专业
付海英,E-mail:fuhaiying@sinap.ac.cn
- 基金信息：
DOI：10.11889/j.0253-3219.2016.hjs.39.020602
中图分类号： TL426;TL241.2+2收稿日期：2015-09-18，
录用日期：2016-01-04，
纸质出版日期：2016-01-25
- 稿件说明：
移动端阅览
贾昀澎, 王子豪, 耿俊霞, 等. FLiNaK熔盐中CsF的蒸发与分离[J]. 核技术, 2016,39(2):020602
Yunpeng JIA, Zihao WANG, Junxia GENG, et al. Evaporation and separation of CsF in FLiNaK molten salt[J]. Nuclear techniques, 2016, 39(2): 020602
贾昀澎, 王子豪, 耿俊霞, 等. FLiNaK熔盐中CsF的蒸发与分离[J]. 核技术, 2016,39(2):020602 DOI： 10.11889/j.0253-3219.2016.hjs.39.020602.
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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