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http://dx.doi.org/10.1016/j.net.2021.11.004

Effect of process parameters on the recovery of thorium tetrafluoride prepared by hydrofluorination of thorium oxide, and their optimization  

Kumar, Raj (Uranium Extraction Division, Bhabha Atomic Research Centre)
Gupta, Sonal (Uranium Extraction Division, Bhabha Atomic Research Centre)
Wajhal, Sourabh (Solid State Physics Division, Bhabha Atomic Research Centre)
Satpati, S.K. (Uranium Extraction Division, Bhabha Atomic Research Centre)
Sahu, M.L. (Uranium Extraction Division, Bhabha Atomic Research Centre)
Publication Information
Nuclear Engineering and Technology / v.54, no.5, 2022 , pp. 1560-1569 More about this Journal
Abstract
Liquid fueled molten salt reactors (MSRs) have seen renewed interest because of their inherent safety features, higher thermal efficiency and potential for efficient thorium utilisation for power generation. Thorium fluoride is one of the salts used in liquid fueled MSRs employing Th-U cycle. In the present study, ThF4 was prepared by hydro-fluorination of ThO2 using anhydrous HF gas. Process parameters viz. bed depth, hydrofluorination time and hydrofluorination temperature, were optimized for the preparation of ThF4 in a static bed reactor setup. The products were characterized with X-Ray diffraction and experimental conditions for complete conversion to ThF4 were established which also corroborated with the yield values. Hydrofluorination of ThO2 at 450 ℃ for half an hour at a bed depth of 6 mm gave the best result, with a yield of about 99.36% ThF4. No unconverted oxide or any other impurity was observed. Rietveld refinement was performed on the XRD data of this ThF4, and Chi2 value of 3.54 indicated good agreement between observed and calculated profiles.
Keywords
Molten salt reactors; Hydrofluorination; Static bed reactor; Bed depth; X-ray diffraction; Rietveld refinement;
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