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Optimization of Pressure Leaching of Chalcopyrite Concentrate with Oxygen and Kinetics Study of the Process in Sulfuric Acid Solution

Mojtahedi, Behrad | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52280 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Yoozbashizadeh, Hossein
  7. Abstract:
  8. The enormous benefits of hydrometallurgical processes have led to the progressive metals extraction industry. Many studies are carried out on the application of these processes in the copper extraction industry. In this research, the oxygen pressure leaching of chalcopyrite concentrate was studied. Experiments were carried out under conditions of the solid-liquid ratio of 0.1, agitation speed of 750 rpm, and sulfuric acid concentration of 2M in a stainless-steel autoclave system. Central composite design (CCD) was used to design experiments, and three factors of temperature, time, and pressure of oxygen, were selected as design variables. The obtained model for %Cu includes parameters of linear and one interaction between temperature and time, and a quadratic model was proposed for the %Fe by Minitab software. Analysis of variance confirmed that the models are well-fitted to experimental data. Results showed that temperature is the most effective factor in chalcopyrite leaching. Optimal conditions were obtained with the aim of maximum copper extraction at the time of 287.7 min, The temperature of 207.2 °C and the oxygen pressure of 11.3 bar. in these conditions copper, 93% was extracted. the kinetic study illustrated that the diffusion process from a passive layer which is produced during the leaching of chalcopyrite is controlling the copper dissolution rate. So, it can be represented by the 1-2/3 α-(1-α)^(2/3)=k_d t model. The activation energy was calculated to be 14.19 kJ/mol
  9. Keywords:
  10. Chalcopyrite ; Oxygen Pressur Leaching ; Dissolution Kinetics ; Copper Dissolution ; Iron Dissolution

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