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Ebrahimi, Narjes Khatoon | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43841 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Samadfam, Mohammad; Mallah, Mohammad Hassan; Safdari, Jaber
  7. Abstract:
  8. In many uranium mines such as gachin-bandarabbas, use sulfuric acid for leaching operation on ore. This leach liquor, containing uranium, is extracted by organic solvent, such as D2EHPA (dapex process ).althogh this process have being used for many years, there is a vacancy for detailed thermodynamical studying on uranium extraction of uranium from leach liquor. To have a thermodynamical model, we need information on equilibrium concentration of all component that may have effect on uranium extraction in addition we need concentration of solvent , pH, phase ratio and activity coefficient.such a model must have the ability to predict the equilibrium concentration in alloperation condition. we got good result by using bromley model. Beside this equation, we used Meissner model that was not good agreement with experimental result. All calculation were made by Matlab program. Also, the equilibrium constant were compared with extraction constant and the result show that for extracting of uranium above 20 percent, the extracting constant become.that is the activity coefficient remains almost . At the end the thermodynamical parameters such as Gibbs free energy , Enthalpy and Entropy were obtained
  9. Keywords:
  10. Solvent Extraction ; Sulfuric Acid ; Thermodynamic Model ; Thermodynamic Parameters ; Sulfuric Acid ; Oranium ; Diethyl Hexyl Phosphoric Acid (DEHPA)

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