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Investigation on Novel Methods of Precious Metals Recovery from Spent Catalysts

Hassan Nejad, Hesam | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42182 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kazemeini, Mohammad
  7. Abstract:
  8. High demand and price and restricted availability of Platinum Group Metals (PGMs) have made platinum recovery a major field of study for researchers and industries. Various methods have been introduced for this purpose. Ion exchange, leaching and liquid-liquid extraction (LLE) are just a few examples. Nowadays Solvent Extraction (SX) is one of the most challenging areas of study for platinum recovery from spent catalysts due to its simplicity and optimum cost. In this study, the commercial spent catalyst’s platinum was dissolved in aqua-regia after XRF analysis. Then it was extracted by the organic material Trioctylphosphineoxide diluted in toluene in the presence of Alkaline metal salts. ICP analysis proved that platinum can be extracted quantitatively up to 90%. KCl showed the best additive effect between LiCl, NaCl and KCl. Additive effect may be referenced as the Salting-Out Effect. Platinum extraction by TOPO were designed by the software “Design Expert 8” and the optimum point were predicted. Three equations were achieved as a function of three variables, contact time, extractant concentration and KCl concentration. Separation factor of platinum to aluminium were also calculated in various conditions and the optimum point were predicted.

  9. Keywords:
  10. Liquid-Liquid Extraction ; Spent Catalyst ; Solvent Extraction ; Platinum Recovery ; Trioctylphosphineoxide ; Salting-Out Effect

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