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Production of Uranium Dioxide Nano Powder With Hydrothermal Method in Supercritical Water Reactor

Golzary, Abooali | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40401 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Outokesh, Mohammad; Ahmadi, Javad; Karimi Sabet, Javad
  7. Abstract:
  8. Hydrothermal supercritical method is one of the most suitable methods for metal oxide nano powder, ceramics and mineral catalyst synthesis. Metal oxides nanopowder in its pure or mixed form has wide potential application as chemical industrial catalyst, hot Superconductors, magnetic material, gas sensors and car catalyst convertors. One of the most important metal oxides aspects of application is uranium oxide as nuclear reactor fuel is used. In addition, UO2 is selective catalyst for converting methane to methanol process and Decomposition of organic Chlorine material. In Supercritical hydrothermal method done in high pressure reactor with critical to fluid, is new method for the production of nanoparticles that have many advantages compared to other conventional methods, which will be explained. In the first chapter with the introduction of nanoparticles and with the introduction of supercritical fluids pay to parameters affecting formation of nanoparticles in supercritical condition. And investigation processes and methods for producing nanoparticles that are used. In chapter 2 with the introduction uranium dioxide and ceramics fuel and, we have pay General expression than the usual methods of preparation and production of powder to compare them with the proposed method. Third chapter begins with the introduction of "design experiment" or the Taguchi method of uranium dioxide nanoparticles synthesis. Due to the importance of purity, efficiency and particle size of product formed must be fundamental variables and effective on these parameters must be considered. Synthesis temperature, time left, the initial concentration and pH are some parameters have been investigated that determine the type and their impact on the three objectives of the program he started by "QUALI-TEK4" the responsibility to design experiments. In addition, in this section except water, investigation the effects other fluids on the formation of UO2 as a final product of ethanol is then selected as the top fluid experiments with this fluid and eventually continue this chapter by mentioning the results of laboratory experiments designed and tested to have taken. In the fourth chapter the results on the effectiveness of computer program parameters on the three objectives above review will show that we have the full realization of three objectives (high efficiency, small size and low impurities) simultaneously is not possible, therefore a balance must exist between them. Finally, in particular the optimum conditions to produce nano powders of uranium dioxide with small size and high purity (not very high efficiency) leads will be introduced.

  9. Keywords:
  10. Nanostructure ; Supercritical Fluid ; Uranium Oxide ; Hydrothermal Method ; Taguchi Optimization ; High Pressure Reactor

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