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Bioleaching of Vanadium from Multimetal Ore of Saghand Mine

Gharahbagheri, Hassan | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42565 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petrochemical Engineering
  6. Advisor(s): Roosta Azad, Reza; Safdari, Jaber; Firouzzare, Mohammad Ali
  7. Abstract:
  8. In this work bioleaching of vanadium has been done from Saghand Ore (Anomaly II). Leaching of vanadium was done in several stages. First, Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxxidans were used for dissolution of pure vanadium pentoxide and it was observed that these bacteria are able to dissolve and reduce vanadium with high efficiency. After that these bacteria were employed to leaching of vanadium from ore; however there were no results by those experiments and no vanadium dissolved in liquor although bacterial activity was visible. In the second stage, oxalic acid 0.1 M as an organic acid and three inorganic acids, namely sulfuric, hydrochloridric and nitric acids, in which the molarity of each was 8, were employed for vanadium dissolution. Nitric acid dissolved 24% of vanadium which was the best answer among the inorganic acids. Also, oxalic acid dissolved 9% of vanadium. Besides, salt roasting method was used that extracts about 9% of vanadium in optimal case. After that, in an experiment design using response surface methodology several combinations of three organic acids, namely oxalic, citric and gluconic acids, were used to investigate the influence of each of these acids on vanadium dissolution. 25% of vanadium was dissolved in the best case and oxalic acid was recognized as the most effective agent to this goal. In the third stage, Aspergillus niger was used that could dissolve about 45% of vanadium and this is a sign of power of produced metabolites by fungi, especially oxalic, citric and gluconic acids, for creating complex with the metals present in the interface and bringing them to the soluble phase
  9. Keywords:
  10. Bioleaching ; Vanadium ; Aspergillus Niger ; Acidithiobacillus Thiooxidans ; Acidithiobacillus Ferooxidans

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