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氧化物沉淀-减压蒸馏耦合分离FLiNaK熔盐中的NdF3
Separation of NdF3 using precipitation-distillation coupled method in FLiNaK molten salt
- 核技术 2017年40卷第1期 文章编号：010603
- 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：
[ "黄丹丹，女，1990 年出生，2012 年毕业于郑州大学，现为硕士研究生，化学专业", "HUANG Dandan, female, born in 1990, graduated from Zhengzhou University in 2012, master student, major in chemistry" ]
付海英, E-mail:fuhaiying@sinap.ac.cn FU Haiying. E-mail:fuhaiying@sinap.ac.cn
王锦花, E-mail:jinhuawang@staff.shu.edu.cn WANG Jinhua. E-mail:jinhuawang@staff.shu.edu.cn
- 基金信息：中国科学院战略性科技先导专项资助(No.XDA02030000)
DOI：10.11889/j.0253-3219.2017.hjs.40.010603
中图分类号： TL426;TL241.2+2收稿日期：2016-09-26，
修回日期：2016-11-28，
纸质出版日期：2017-01
- 稿件说明：
移动端阅览
黄丹丹, 贾昀澎, 王子豪, 等. 氧化物沉淀-减压蒸馏耦合分离FLiNaK熔盐中的NdF3[J]. 核技术, 2017,40(1):010603
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
黄丹丹, 贾昀澎, 王子豪, 等. 氧化物沉淀-减压蒸馏耦合分离FLiNaK熔盐中的NdF3[J]. 核技术, 2017,40(1):010603 DOI： 10.11889/j.0253-3219.2017.hjs.40.010603.
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
3
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
（
w
=3%）的FLiNaK熔盐中加入CaO，730℃下反应6 h，
n
（NdF
3
）：
n
（CaO）=1：3时NdF
3
的转化率达95%。X射线衍射（X-ray Diffraction，XRD）分析表明生成的Nd
2
O
3
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
5
，而未经沉淀处理Nd的去污因子为3.1×10
4
，表明高温沉淀蒸馏耦合法使稀土NdF
3
转化为氧化物Nd
2
O
3
，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
2
) in the thorium based molten salt reactors (TMSR).
Purpose:
This study aims to compare the separation behavior of NdF
3
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
n
(XRD) was applied to the analysis of the produced NdF
3
in the molten salt.
Results:
At high temperature
CaO was confirmed to react with NdF
3
and form rare earth oxide Nd
2
O
3
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
5
whilst the value was 3.1×10
4
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.
关键词
Keywords
references
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