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Optimization of Effective Parameters in Biological Extraction of Mo and Ni from Spent Catalyst

Ghojavand, Fatemeh | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42863 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Yaghmaei, Soheila
  7. Abstract:
  8. During oil refinement, solid catalysts which contain metals such as aluminum, tungstan, molybdenum and nickel are highly used. Following several times reductions and re-applications, their activity potentiality is decreased in a such a way that they can not be re-used., as a result of which they are treated as solid waste. Based on natural potentiality, microorganisms are defined as convertibles of solid compounds to extractive forms and soluble materials. This project aims at finding other factors that have more impact on biological extraction and determining optimal conditions for biological extraction in order to reach maximum extraction efficiency within discontinuous conditions. The microorganism used in this research is a thermophile bacteria called Acidianus Brierleyi. To fulfill the research procedure, initially the impact of 10 influential factors in bioleaching are specified using an appropriate statistical method (Plackett – Burman) and then 4 major variables (pH, pulp density, inoculation percentage and sulfur quantity) are optimized via Response Surface Methodology. The optimal amount of this factors include: pH (1.6), pulp density (0.6 g/L), inoculation percentage (4%), and sulfure quantity (4g/L). optimum combination of the above factors creat a new result about the interactions among such factors during biological extraction. Through this procedure, maximum recovery of the extracted metal is obtained which for aluminm (as the basic catalyst used) is equal to 35.27%, while it is 83.32% for molybdenum and 68.74% for nickel
  9. Keywords:
  10. Optimization ; Spent Catalyst ; Bioleaching ; Acidianus Brierleyi

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