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Aluminum Production by Alumina Electrolysis Method with Using Inconel 617 Inert Anode

Vakil, Mohammad Mahdi | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55797 (07)
  4. University: Sharif University of Technology
  5. Department: Materials science and Engineering
  6. Advisor(s): Halali, Mohammad
  7. Abstract:
  8. In this study, the performance of Inconel 617 anode as an inert anode in aluminum electrolysis process was studied. To carry out the research, first, an electrolyte was produced using NaF, KF, AlF3 and Al2O3 with a molar ratio of sodium and potassium fluoride to aluminum fluoride of 1.33. Next, aluminum electrolysis cell was made using Inconel 617 anode and cathode and the aforementioned electrolyte. To evaluate the Inconel 617 anode, the performance of the electrolysis cell in different conditions of temperature, anode-cathode distance, and excess potential was investigated in a period of one hour. Using anode mass measurements, cell potential and current density and scanning electron microscope map analysis images, anode behavior in the cell was evaluated. The results of these studies showed that with the reduction of the electrolysis temperature, the weight loss percentage of the Inconel 617 anode decreases in a period of one hour. Also, excess voltage increases the amount of anode consumption. Decreasing the distance between anode and cathode to the extent that the emission of gas does not have an effect on the amount of concentration polarization, reduces anode consumption. In total, these studies showed that the anode at the minimum temperature of the test (800oC), the distance of 2 cm between the anode and the cathode, and zero excess voltage shows the lowest oxidation rate. The percentage of weight loss due to the oxidation of the anode in the period of one hour reached 0.198% in the lowest measurement, which showed that Inconel 617 anode cannot be used as an ineffective anode in the aluminum electrolysis process. Finally, the images of the scanning electron microscope map analysis showed the different vulnerable elements of the anode. Iron and molybdenum entered the electrolyte in a relatively high amount under electrolysis conditions and showed high vulnerability. Unlike the mentioned elements, nickel has shown more stability in the conditions of electrolysis and entered the electrolyte to a much lesser extent
  9. Keywords:
  10. Inconel 617 Superalloy ; Hall Theorm ; Aluminum Electrolysis ; Inert Anode ; Anode Oxidation

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