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Kinetics of pressure oxidative leaching of molybdenite concentrate by nitric acid

Khoshnevisan, A ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1016/j.hydromet.2011.10.002
  3. Publisher: 2012
  4. Abstract:
  5. The current study was carried out to investigate the kinetics of reactions for the pressure oxidative leaching of a molybdenite concentrate in less than one hour. The effects of oxygen pressure, stirring speed, pulp density, acid concentration and temperature on the leaching rate of the molybdenum were studied. It was found that about 85% of molybdenite was oxidized to molybdic oxide precipitate with remaining molybdenum dissolved in the leaching liquor. Analysis of experimental data showed that the reaction is chemically controlled with activation energy of 68.8 kJ/mol. Furthermore SEM images showed no significant boundary diffusion layer and it was noted that the molybdic oxide precipitates were of fibrous shape
  6. Keywords:
  7. Acid concentrations ; Boundary diffusion layers ; Experimental data ; Fibrous shape ; Leaching rates ; Molybdenite concentrate ; Molybdic oxide ; Oxidative Leaching ; Oxygen pressure ; Pressure leaching ; Pulp density ; SEM image ; Stirring speed ; Activation energy ; Enzyme kinetics ; Kinetics ; Leaching ; Molybdenum ; Molybdenum oxide ; Precipitates ; Nitric acid
  8. Source: Hydrometallurgy ; Volume 111-112, Issue 1 , January , 2012 , Pages 52-57 ; 0304386X (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0304386X11002076