Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Effect of oxygen containing compounds in uranium tetrafluoride on its non-adiabatic calciothermic reduction characteristics

  • Gupta, Sonal (Uranium Extraction Division, Bhabha Atomic Research Centre) ;
  • Kumar, Raj (Uranium Extraction Division, Bhabha Atomic Research Centre) ;
  • Satpati, Santosh K. (Uranium Extraction Division, Bhabha Atomic Research Centre) ;
  • Sahu, Manharan L. (Uranium Extraction Division, Bhabha Atomic Research Centre)
  • Received : 2020.07.12
  • Accepted : 2020.12.21
  • Published : 2021.06.25
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Abstract

Uranium ingot is produced by metallothermic reduction of uranium tetrafluoride using magnesium or calcium as reductant. Presence of oxygen containing compounds viz. uranyl fluoride and uranium oxide in the starting uranium fluoride has a significant effect on the firing time, final temperature of the charge, slag-metal separation and hence the metal recovery. As reported in the literature, the maximum tolerable limit for uranyl fluoride in the UF4 is 2.5 wt% and limit for uranium oxide content is in the range 2-3 wt%. No theoretical or experimental basis is available till date for these limits. Analyses have been carried out in this study to understand the effect of UO2F2 concentration in the starting fluoride on the final temperature of the products and thus the reduction characteristics. UF4 having uranyl fluoride concentration, less than as well as more than 2.5 wt%, have been investigated. Thermodynamic calculations have been carried out to arrive at a general expression for the final temperature attained by the products during calciothermic reduction of UF4. Finally, an upper limit for the oxygen containing impurities has been estimated using the CaO-CaF2 phase diagram.

Keywords

Acknowledgement

The authors are thankful to Shri Pramendra Singh, Shri U.B. Naik and all other staff of our lab for their extended support in carrying out the calciothermic reduction experiments. The authors also thank Shri K.N. Hareendhran and Shri S.V. Kadam for carrying out the chemical analysis of UF4 samples.

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