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Kinetic of Zinc Sulfide Roasting of

Marzoughi, Omid | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46983 (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 effect of two main parameters, time and temperature, were investigated in the roasting process of zinc sulfide of Bafgh’s mine, and kinetics and the mechanism of the roasting reaction were examined, too. The oxidation process was performed in a muffle furnace in the presence of the oxygen of air atmosphere. The raw powder material (with the particle size of 74-250 micron) was poured in Alumina crucibles. The roasting process was run in eight temperatures of 650, 700, 750, 800, 850, 900, 950 and 1000 ◦C. Oxidation percent was calculated in six times of 5, 10, 15, 30, 45 and 60 minutes. The experiments were designed in a way that the effect of each parameter could be evaluated quantitatively. The results presented that the highest oxidation percent occurred in 950 ◦C and 60 minutes. The reaction mechanism was shrinking core model that the controlling step was chemical reaction between zinc sulfide and oxygen, in the temperature range of 650-800◦C with the activation energy of 105.57 kj.mol-1, and oxygen diffusion in the temperature range of 850-950 ◦C with the activation energy of 50.48 kj.mol-1. The amount of calculated activation energy in the temperature ranges of roasting experiments, was supported by thermal analysis methods and two kinetic models, Freeman and Friedman and Caroll
  9. Keywords:
  10. Kinetics Study ; Reaction Mechanism ; Thermal Analysis ; Roasting ; Zinc Sulfide ; Zine Sulfide Roasting ; Bafgh's Mine

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