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Study on the Factors Affecting in the Thermal Decomposition of Ammonium Uranyl Carbonate (AUC) to Uranium Dioxide (UO2)

Ghannadi Baradaran, Mahdi | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41863 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Otoukesh, Mohammad; khanchi, Alireza
  7. Abstract:
  8. According to the literature survey, the thermal decomposition of ammonium uranyl carbonate (AUC) is affected by different factors such as its purity and environmental conditions. Thermal treatment of this compound in the air atmosphere results in the production of at least three oxide forms of uranium (UO3, U3O8 and UO2) with different stoichiometric structure. The aim of this project was to study the effects of those parameters which play role in the decomposition of AUC and the production of UO2 compound in the presence of ammonia atmosphere. Therefore, an atmosphere control furnace was designed and constructed to establish the gas in the atmosphere of furnace chamber. On the other hand, two different ways were chosen for heat transfer in the chamber of furnace; (1) Conduction heat transfer from the floor, and (2) radiation heat transfer from the above. The factors affecting in the process was temperature, mass, residence time and flow of gas passing through the sample. Design of experiments was carried out with consideration of these variables and utilization of MINITAB software using a regression model and the amount of UO2 was considered as response for the above mentioned variables. UO2 values were determined with XRD and Rietveld quantitative phase analysis method. The results of experiments showed that the formation of UO2 was markedly influenced by the furnace temperature. The second significant variable was the residence time. The results also revealed that the flow of ammonia has negligible effect in the reduction of higher oxidation state species of uranium oxides to uranium dioxide
  9. Keywords:
  10. Uranium Oxide ; Effective Parameters ; Ammonium Uranyl Carbonate

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