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Nickel Recovery From Copper Bleed Solution

Shabani, Alireza | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46709 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Yoozbashizadeh, Hossein
  7. Abstract:
  8. In copper electrorefining process, to control Nickel and other impurities concentration and avoiding copper cathode contamination, a certain volume of electrolyte is withdrawn continuously from the circulation system and replaced by fresh electrolyte. The spent electrolyte includes valuable elements such as Nickel, Copper, Iron and also great value of sulfuric acid which is worthwhile to be recycled. Solvent Displacement Crystallization (SDC) method is suitable for this purpose because it retains significant amount of acid and have low energy consumption. The present work studies the using of SDC method to recover Nickel and other impurities from Sarcheshme Copper bleed solution and returning it to process cycle. Obtained results indicate that a slow addition of Isopropanol (low supersaturation) to O/A ratio of 5 can decrease Nickel Concentration from 2851.3 to 226.2 ppm which is equivalent to 92% Nickel extraction. In the next step, SDC precipitations dissolved in Water, creating a solution with pH value equal to 3 which make it possible to recover Iron and Copper using solvent extraction or chemical precipitation. Also, it should be mentioned that some component such as Iron, Arsenic and Calcium could not be dissolved well in water which is very important for purity of other products. For Copper recovery two processes, electrowinning and cementation, was studied. Result of these studies show that electorowinning is suitable for Copper recovery from Copper bleed solution, but cementation should be done after dissolution step which prevents excessive Iron consumption due to higher pH value
  9. Keywords:
  10. Nickel ; Electrowining ; Cementation ; Copper Bleed Solution ; Solvent Displacement Crystallization

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