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Bioleaching of Metal from Electronic Wastes Using Acidithiobacillus Ferrooxidans

Haghshenas Fatmehsari, Hoda | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49595 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Yaghmaei, Soheila
  7. Abstract:
  8. The recycling of the secondary resources for the extraction of their metallic contents is undoubtedly environmentally friendly and can be economic. One of the most important secondary resources is the electronic wastes (E-wastes) which has been widely produced as the discarded electrical/electronic devices. The usual physical/chemical treatments of E-wastes not only result in an increase in human health risks and environmental pollution but also lead to the missing of their valuable metallic contents. An alternative method for the recycling of E-wastes is bioleaching which has recently attracted more attention. The advantages of this process are low energy consumption and environment friendliness. In the present study, the effect of some important parameters including temperature, particle size, and initial Fe2+ concentration on the rate of Cu dissolution from E-wastes (electronic boards) by Acidithiobacillus ferrooxidans was investigated. The highest recovery of Cu was achieved around 70% after 70 h at Fe2+ concentration of 9 g/L. The result also showed that the recovery of Cu did not change significantly at elevated temperatures (from 25 to 35 OC). Moreover, the smaller particle size resulted in higher Cu recovery which was attributed to higher available surface for reaction proceeding. Finally, the kinetics modeling indicated that ash diffusion step is the rate controlling step and the activation energy was estimated to be 19 kJ/mol
  9. Keywords:
  10. Adaptation ; Kinetics Study ; Bioleaching ; Electronic Waste ; Thiobacillus Ferrooxidans

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