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Removal of Fluorine from radioactive solid waste of Esfahan Uranium Conversion Facility

Gerami, Vahid | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43853 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Samadfam, Mohammad; Khanchi, Alireza; Gasemi, Hosein
  7. Abstract:
  8. Uranium is the most important element in the nuclear fuel cycle. Recovery of uranium from waste produced at every stage of the fuel cycle is not only economically important, but also environmentally important. In the production phase of uranium hexafluoride, certain amount of solid waste is produced in the bottom of the fluorination reactor. In order to extract the uranium from this waste, we have to eliminate the fluorine contained in the waste. This is because the fluorine forms strong complex with uranyl ions during the extraction process, and prevents from efficient extraction of uranium. In the current thesis؛ first, we examined the characteristics of the waste produced at the fluorination reactor of the Esfahan Uranium Conversion Facility (UCF). After identifying the elements in the waste, both the wet and dry methods were investigated for the removal of fluorine from the waste. In the wet methods, solid waste containing high amounts of fluorine was reacted with soda solution at different concentrations, temperatures and reaction times. In the dry method (furnace), the waste reacted with silica at temperatures above 500 C at different reaction times, to release the fluorine from the waste in the form of fluoride gas. To measure the amount of fluorine in solid samples, the back titration method is used. The amount of fluorine in dry reaction products were 0.05-0.5 Wt% and in the wet samples of 2-6 Wt%. In the dry method, the residual fluorine content decreased to about 5% of its initial value
  9. Keywords:
  10. Uranium Recovery ; Waste Characterisation ; Wet Process ; Fluorine Removal ; Dry Method ; Fluorine Amount ; Back Titration

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