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Effect of Cu2+ on Leaching of Chalcopyrite in Chloride Media and Investigation of Thermodynamic and Kinetics of Process and Comparison with Sulfate Media

Rasouli Jooryabi, Saleh | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52843 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Yoozbashi Zadeh, Hossein
  7. Abstract:
  8. High advantages of hydrometallurgy have led to its recent development in metal extraction. Many investigations have been carried out on applying hydrometallurgy processes on copper extraction. In this study, Chalcopyrite concentrate produced in Sarcheshmeh copper plant was subjected to oxidative leaching investigation by cupric ion to determine the effect of several parameters on the copper and iron dissolution, included temperature of leaching, time of holding and cupric concentration as oxidant agent in a range of 38-97°C, 1.5-8.5 hours and 0.2-0.8 M respectively. The leaching media was chloride providing with 3M HCl 37% and CuCl2. The experiments were designed by central composite design (CCD) method. The dissolution of copper and iron were examined, the maximum dissolution of copper 62.64%, obtained at 85°C, 7 hours and oxidant concentration of 0.7M. The kinetics model of Chalcopyrite leaching and an optimized condition with maximum dissolution of copper and minimum dissolution of iron obtained by Minitabr18 software. Additionally, the thermodynamics of leaching was investigated by pourbaix diagrams of copper and iron composition, using HSC Chemistry6 software. It was found that the oxidative leaching process is controlled by diffusion through passivated layer with an activation energy of 19.57 kJ/mol. According to importance of sulfuric acid in industrial plants, an OFAT comparison between chloride and sulfate media was performed. As it was predicted dissolution of copper in chloride media is more than dissolution in sulfate media
  9. Keywords:
  10. Chalcopyrite ; Copper Extraction ; Cupric Ion Oxidant ; Oxidation Leaching ; Hydrometallurgy

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