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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- NUCLEAR TECHNIQUES
- Vol. 47, Issue 1, 010302 (2024)

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

Fig. 2. Gibbs free energy (ΔrGm) change of REF3-Na2S reaction

Fig. 3. Removal ratios when the ratio of NdF3 to Na2S∙5H2O content is 1:2 under different temperatures for 5 h

Fig. 4. Photograph of Salt after adding Na2S·5H2O to REF3-LiF-BeF2 at 600 °C (a) NdF3, (b) CeF3, (c) SmF3, (d) YbF3

Fig. 5. XRD patterns of the precipitates after adding Na2S·5H2O to REF3-LiF-BeF2(a) NdF3, (b) CeF3, (c) SmF3, (d) EuF3

Fig. 6. SEM images of the precipitates after adding Na2S·5H2O to NdF3 (a), SmF3 (b)-LiF-BeF2 molten salt

Fig. 7. EDS images of precipitates after adding Na2S·5H2O to EuF3-LiF-BeF2 molten salt

Fig. 8. S 2p XPS spectra of precipitate after adding Na2S∙5H2O to NdF3-LiF-BeF2

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]](/Images/icon/loading.gif)
Fig. 10. Snapshots of distillation equipment (a) and quartz tube with nickel foil collection device (b)[28]

Fig. 11. Photograph of ThF4-LiF-BeF2 salt (a) and mixed molten salt after adding Na2S∙5H2O (b)

Fig. 12. XRD patterns of precipitates after adding Na2S·5H2O to ThF4-LiF-BeF2
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Table 1. Removal ratios, oxygen and sulfur content for various Na2S ∙5H2O contents at 600 ℃
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Table 2. Removal ratios of RE with REF3 ∶Na2S ∙5H2O = 1 ∶2 at 600 ℃
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Table 3. Oxygen content in molten salt before and after reaction

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