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Optimization of the Solvent Extraction of Rhenium from Acidic Solution Produced by Pressure Leaching of Molybdenite Concentrate

Azarpeyvand, Faezeh | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40074 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Yoozbashizadeh, Hossein
  7. Abstract:
  8. The extraction of molybdenum and rhenium from acidic solution produced by pressure leaching of molybdenite concentrate, using organophosphorus solvents has been investigated. First, extraction of molybdenum by Di-2-EthyHexyl Phosphoric Acid (D2EHPA) extractant dissolved in kerosene diluents was done. Extraction experiments were designed using Taguchi L16b orthogonal array. The effects of four factors: Shaking time, Organic solvent concentration, Organic to aqueous phase ratio, pH were studied in four levels. Optimum conditions occur at: shaking time: 35 min, organic solvent concentration: 30 volumetric percent, organic to aqueous phase ratio: 3, pH: 7 and molybdenum is completely extracted. The contribution percentage of each factor in molybdenum extraction was calculated using the analysis of variance (ANOVA), and the following values were obtained: organic solvent concentration:23.1156% shaking time: 3.0254% pH: 14.6780% organic to aqueous phase ratio:45.1074% The value of 14.6370% was calculated for Taguchi error at this stage. After complete extraction of molybdenum under the optimum conditions, extraction of rhenium using Tri-n-Butyl Phosphate (TBP) organic solvent dissolved in kerosene diluents was conducted. Using Taguchi's L9 orthogonal array, the effects of four mentioned factors were evaluated in three levels. Optimum conditions were obtained at: shaking time: 30 min, organic solvent concentration: 60 volumetric percent, organic to aqueous phase ratio: 3, pH: 0.5. Under the optimum conditions 80% of rhenium was extracted. The contribution of the factors according to the analysis of variance (ANOVA) is as follows: organic solvent concentration:45.1% shaking time: negligible pH: 44.059% organic to aqueous phase ratio:10.725% Taguchi error value in this stage was obtained as 0.116%.
  9. Keywords:
  10. Rhenium ; Molybdenum ; Taguchi Method ; Variance Analysis ; Solvent Extraction ; Orthogonal Array ; Pressure Leaching

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