• NUCLEAR TECHNIQUES
  • Vol. 47, Issue 1, 010302 (2024)
Yujiao WANG1,2, Yaxin QU2,3, Haiying FU2,3,*, Ming CHENG2,3..., Qiang DOU2,3 and Yu GONG2,3|Show fewer author(s)
Author Affiliations
  • 1ShanghaiTech University, Shanghai 201210, China
  • 2Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China
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    DOI: 10.11889/j.0253-3219.2024.hjs.47.010302 Cite this Article
    Yujiao WANG, Yaxin QU, Haiying FU, Ming CHENG, Qiang DOU, Yu GONG. Separation of rare earth fission products from LiF-BeF2 molten salt by sulfide precipitation[J]. NUCLEAR TECHNIQUES, 2024, 47(1): 010302 Copy Citation Text show less
    LiF-BeF2 and REF3-LiF-BeF2 mixed molten salts (color online)(a) LiF-BeF2, (b) NdF3-LiF-BeF2, (c) CeF3-LiF-BeF2, (d) SmF3-LiF-BeF2, (e) YbF3-LiF-BeF2
    Fig. 1. LiF-BeF2 and REF3-LiF-BeF2 mixed molten salts (color online)(a) LiF-BeF2, (b) NdF3-LiF-BeF2, (c) CeF3-LiF-BeF2, (d) SmF3-LiF-BeF2, (e) YbF3-LiF-BeF2
    Gibbs free energy (ΔrGm) change of REF3-Na2S reaction
    Fig. 2. Gibbs free energy (ΔrGm) change of REF3-Na2S reaction
    Removal ratios when the ratio of NdF3 to Na2S∙5H2O content is 1:2 under different temperatures for 5 h
    Fig. 3. Removal ratios when the ratio of NdF3 to Na2S∙5H2O content is 1:2 under different temperatures for 5 h
    Photograph of Salt after adding Na2S·5H2O to REF3-LiF-BeF2 at 600 °C (a) NdF3, (b) CeF3, (c) SmF3, (d) YbF3
    Fig. 4. Photograph of Salt after adding Na2S·5H2O to REF3-LiF-BeF2 at 600 °C (a) NdF3, (b) CeF3, (c) SmF3, (d) YbF3
    XRD patterns of the precipitates after adding Na2S·5H2O to REF3-LiF-BeF2(a) NdF3, (b) CeF3, (c) SmF3, (d) EuF3
    Fig. 5. XRD patterns of the precipitates after adding Na2S·5H2O to REF3-LiF-BeF2(a) NdF3, (b) CeF3, (c) SmF3, (d) EuF3
    SEM images of the precipitates after adding Na2S·5H2O to NdF3 (a), SmF3 (b)-LiF-BeF2 molten salt
    Fig. 6. SEM images of the precipitates after adding Na2S·5H2O to NdF3 (a), SmF3 (b)-LiF-BeF2 molten salt
    EDS images of precipitates after adding Na2S·5H2O to EuF3-LiF-BeF2 molten salt
    Fig. 7. EDS images of precipitates after adding Na2S·5H2O to EuF3-LiF-BeF2 molten salt
    S 2p XPS spectra of precipitate after adding Na2S∙5H2O to NdF3-LiF-BeF2
    Fig. 8. S 2p XPS spectra of precipitate after adding Na2S∙5H2O to NdF3-LiF-BeF2
    Removal ratio comparison of two systems for RE elements (Nd, Ce, Sm, and Eu)
    Fig. 9. Removal ratio comparison of two systems for RE elements (Nd, Ce, Sm, and Eu)
    Snapshots of distillation equipment (a) and quartz tube with nickel foil collection device (b)[28]
    Fig. 10. Snapshots of distillation equipment (a) and quartz tube with nickel foil collection device (b)[28]
    Photograph of ThF4-LiF-BeF2 salt (a) and mixed molten salt after adding Na2S∙5H2O (b)
    Fig. 11. Photograph of ThF4-LiF-BeF2 salt (a) and mixed molten salt after adding Na2S∙5H2O (b)
    XRD patterns of precipitates after adding Na2S·5H2O to ThF4-LiF-BeF2
    Fig. 12. XRD patterns of precipitates after adding Na2S·5H2O to ThF4-LiF-BeF2
    Na2S∙5H2O∶NdF3

    去除率R

    Removal ratio R / %

    氧含量

    Oxygen content / 10-6 g∙g-1

    硫含量

    Sulphur content / 10-6 g∙g-1

    1∶172.31 120403
    1.5∶178.91 8301 160
    2∶181.42 1191 275
    3∶188.92 5602 450
    Table 1. Removal ratios, oxygen and sulfur content for various Na2S5H2O contents at 600

    样品

    Sample

    上层盐中RE3+的浓度 RE3+ concentration in salt / %(w/w)去除率 RRemoval ratio R / %
    反应前 Before reaction反应后 After reaction
    NdF3-LiF-BeF22.1510.398 181.4
    CeF3-LiF-BeF21.5410.338 078.0
    SmF3-LiF-BeF22.5010.996 260.1
    EuF3-LiF-BeF22.0520.271 586.2
    YF3-LiF-BeF21.197 30.347 171.0
    YbF3-LiF-BeF21.296 60.491 062.2
    Table 2. Removal ratios of RE with REF3Na2S5H2O = 12 at 600 ℃

    样品

    Sample

    氧含量

    Oxygen content / 10-6 g∙g-1

    LiF-BeF2360
    CeF3-LiF-BeF2974
    CeF3-LiF-BeF2-Na2S∙5H2O1 621
    NdF3-LiF-BeF21 093
    NdF3-LiF-BeF2-Na2S∙5H2O2 119
    SmF3-LiF-BeF2625
    SmF3-LiF-BeF2-Na2S∙5H2O2 113
    EuF3-LiF-BeF2985
    EuF3-LiF-BeF2-Na2S∙5H2O2 095
    Table 3. Oxygen content in molten salt before and after reaction
    Yujiao WANG, Yaxin QU, Haiying FU, Ming CHENG, Qiang DOU, Yu GONG. Separation of rare earth fission products from LiF-BeF2 molten salt by sulfide precipitation[J]. NUCLEAR TECHNIQUES, 2024, 47(1): 010302
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