Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (1): 10603-010603.doi: 10.11889/j.0253-3219.2017.hjs.40.010603

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles    

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

HUANG Dandan1,2, JIA Yunpeng2, WANG Zihao2, GENG Junxia2, YANG Yang2, DOU Qiang2, LI Qingnuan2, FU Haiying2, WANG Jinhua1   

  1. 1 Shanghai University, Shanghai 200444, China;
    2 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China
  • Received:2016-09-26 Revised:2016-11-28 Online:2017-01-10 Published:2017-01-11
  • Supported by:

    Supported by Strategic Priority Program of Chinese Academy of Sciences (No.XDA02030000)

Abstract:

Background: Low pressure distillation is a promising technology for the recovery and purification of carrier salts (LiF-BeF2) in the thorium based molten salt reactors (TMSR). Purpose: This study aims to compare the separation behavior of NdF3 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 Diffraction(XRD) was applied to the analysis of the produced NdF3 in the molten salt. Results: At high temperature, CaO was confirmed to react with NdF3 and form rare earth oxide Nd2O3 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 9.4×105 whilst the value was 3.1×104 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.

Key words: FLiNaK, CaO, Low pressure distillation, Oxide precipitation

CLC Number: 

  • TL426