Loading...

Experimental Study of Molybdenum Extraction Process in an Oldshue-rushton Extraction Column

Shakib, Benyamin | 2019

875 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51973 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Outokesh, Mohammad; Torab- Mostaedi, Mesam; Asadollahzadeh, Mehdi
  7. Abstract:
  8. Extraction and separetion of molybdenum is important because of its application in different industries. Since molybdenum resources are finite and low-grade, hydrometallurgical methods can be used to extract molybdenum. Solvent extraction of rare metals one of the important processes of hydrometallurgy.In the first of research, molybdenum solvent extraction from sulfate msoloution was investigated in batch and semi-industrial scale. In the laboratory scale, molybdenum solvent extraction from aqueous solution was investigated by using of D2EHPA, Cyanex272 and TBP. The effects of various parameters such as extractrant concentration, synergistic enhancement factor for mixture of extractants, initial pH of aqueous phase, contact time, O/A ratio, Reaction temperature, initial concentration of metal ions in the aqueous phase and type of stripping reagent on the recovery of metal ions were studied. The McCabe- Thiele diagrams for both extraction and stripping stage of molybdenum (VI) were constructe. The results showed that the extraction ability of D2EHPA was lower than that of Cyanex272 extractant. But the synergistic enhancement factor showed that the mixture of D2EHPA and TBP provided better extraction efficiency and effective stripping performance in comparison with single D2EHPA or Cyanex272.In the second stage, the extraction and separation of molybdenum from sulfate solution with mixture of D2EHPA and TBP were carried out by using an Oldshue- Rushton column. The effects of variables such as rotor speed, dispersed and continuous phase velocity on holdup, Sauter mean drop diameter, characteristic and slip velocities, overall dispersed and continuous mass transfer coefficients and extraction efficiencies were studied. It is observed that the effect of rotor speed is found to have a more profound effect on the column performance. The phase flow rates had little influence on the mass transfer coefficients. The dispersed and continuous phase mass transfer coefficients calculated with these correlations predict the experimental data.The results showed more than 90% of the molybdenum (VI) was obtained in 240 rpm of rotor speed and 0.66 mm/s dispersed and continuous phase velocity. The proposed correlations for hydrodynamic parameters and mass transfer coefficients are innovation and achievements of this project
  9. Keywords:
  10. Molybdenum Extraction ; Solvent Extraction ; Tri-butyl Phoaphate ; Hydrodynamic Behaivoir ; Mass Transfer Coefficient ; Cyanex 272 ; Diethyl Hexyl Phosphoric Acid (DEHPA) ; Oldshue-Rushton

 Digital Object List

 Bookmark

No TOC