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Optimization of Leaching of Platinum Group Metals from Spent Car Catalytic Converters

Ziari, Amir Hossein | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50125 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Halali, Mohammad
  7. Abstract:
  8. The catalytic converter converts 95 to 99 percent of the vehicle exhaust gases into environmentally friendly gases, which are installed between the engine and the vehicle's exhaust cistern. The catalyst contained in the converters includes a ceramic structure commonly used as an alumina, coated with metal catalyst of expensive metals of the platinum group (platinum, palladium and rhodium). The purpose of this project is to optimize the recovery of platinum group metals from automotive catalytic converters by hydrometallurgy by hydrochloric acid and oxygenated water as an additive using Design Expert software. In this project, using the factorial design, the effect of parameters of temperature, time, agitation rate, solid-to-liquid ratio, additive concentration and solution concentration on the dissolution rate was considered, taking into account an initial variation interval of the parameters, and the highest amount of dissolution by recovery rate of 96.15% was obtained. According to the factorial design, it was found that the temperature, the ratio of solid to liquid and the concentration of acid had the greatest effect on the dissolution rate, and also the range of changes in these parameters was optimized. Then, using the Response Surface Method, the effect of temperature, solid-to-liquid ratio and acid concentration on solubility was investigated and the highest solubility was achieved with recovery rate of 98.48%. Finally, at 100 ° C, with a solid to liquid ratio of 0.02 g / ml, a 12 molar acid concentration, a 4 hours time, a stirring rate of 500 rpm, and an additive of 15% resulted in the best solubilization conditions with recovery rate of 98.48% and was introduced As the result of leaching optimization
  9. Keywords:
  10. Optimization ; Leaching ; Hydrometallurgy ; Catalytic Converters ; Leaching ; Platinum Group Metals

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