تازه های تحقیق
2. K. Bredberg, H.T. Karlsson, O. Holst, Reduction of vanadium(V) with Acidithio-bacillus ferrooxidans and Acidithiobacillus thiooxidans, Bioresource Technology 92 (2004) 93–96.
3. D. Mishra, D.J. Kim, D.E. Ralph, J.G. Ahn, Y.H. Rhee, Bioleaching of vanadium rich spent refinery catalysts using sulfuroxidizing lithotrophs, Hydrometallurgy 88 (2007) 202–209.
4. C. K. Gupta, N. Krishnamurthy, Extractive metallurgy of vanadium (process metallurgy), Elsevier (1992).
5. F. Habashi, Handbook of extractive metallurgy, Vol III, Wilely, Germany (1997) 1471-1487.
6. Y. Konishi, S. Asai, N. Yoshida, Growth Kinetics of Thiobacillus thiooxidans on the surface of elemental sulfur, Applied and Environmental Microbiology, (1995) 3617-3622.
7. E. Y. Lee, K.S. Cho, H.W. Ryu, Charac-terization of sulfur oxidation by an autotrophic sulfur oxidizer, Thiobacillus sp. ASWW-2, Biotechnol. Bioprocess Eng (5) (2000) 48-52.
8. L. Briand, H. Thomas, E. Donati, Vanadium (V) reduction in Thiobacillus thiooxidans cultures on elemental sulfur, Biotechnology Letters 18 (5) (1996) 505-508.
9. M. A. Ronald, “Handbook of microbiological media (2nd edition),” Robert Stern Publisher, New York (1997).
10.O. Levenspiel, Chemical Reaction eng-ineering, Third Ed, Wiley (1999).
عنوان مقاله [English]
نویسندگان [English]چکیده [English]
Vanadium is an expensive and practical metal in different industries, and in Iran, in particular uranium ore residues contain a considerable amount of this metal. In this investigation reductive dissolution of vanadium using two strains, acidithiobacillus ferrooxidans and acidithiobacillus thiooxidans, in two pulp densities, of 0.5 and 1g/l, were surveyed at 30˚C, and 180 rpm. Acidithiobacillus ferrooxidans adapted to the medium sooner than the acidithiobacillus thiooxidans and had a better result in dissolution of vanadium. In 0.5 and 1g/l, more than 90% of vanadium was disolved by acidithiobacillus ferrooxidans during 6 and 12 days, respectively and by acidithiobacillus thiooxidans in a period of 9 and 20 days, respectively. The experimental data were fitted to first and second order kinetic models, and it was observed that vanadium dissolution followed the second order kinetic model correctly.