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Recovery of Vanadium from Leaching Solution of Roasted Isfahan Steelmaking Slag Using Solvent Extraction

Mousavi, Reza | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54481 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Askari, Masoud
  7. Abstract:
  8. Solvent extraction of vanadium (V) from sulfated leaching solution of the converter slag of the Isfahan steel company followed by stripping of this element from the organic solvent were examined in this study. In the experimental section, 2-ethyl-1-hexanol extractor was utilized for selective separation of V(V) from the acidic medium containing Si, Na, Fe, Al, Ca, and P ions. Ammonium chloride solution was also used for stripping V from the organic phase. Under optimal condition (pH=1.9, T=65℃, extractor concentration of 68% and organic phase volume fraction of 0.66), 91% was extracted in solvent extraction stage. Under optimal stripping conditions (pH=7.5, T=25℃, organic phase volume fraction of 0.33), 96.5% V returned to the aqueous phase. Based on the McCabe-Thiele diagram, high vanadium recovery and purity can be simultaneously achieved by three-stage extraction and two-stage stripping. Moreover, solvent extraction of V by 2-ethyl-1-hexanol extractor was described based on the esterification mechanism. In this regard, Si and Na were the most effective elements on the vanadium extraction whose influence on the process was examined. Some suggestions were finally presented for decreasing the adverse impact of the mentioned interfering ions to further increment the vanadium extraction in future studies
  9. Keywords:
  10. Vanadium ; Solvent Extraction ; Stripping ; Esterification ; Optimization ; Steel Making Slag ; 2-Ethyl-1-Hexanol Extractor

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