A Review of Niobium-Tantalum Separation in Hydrometallurgy
- 1 Department of Chemistry, Faculty of Applied Sciences, Cape Peninsula University of Technology, P.O. Box 652, Cape Town, South Africa.
- 2 Department of Chemistry, University of Ilorin, P.M.B 1515, Ilorin, Nigeria.
Abstract
Niobium and tantalum are chemically similar and are associated with each other in nature which makes it very difficult to separate. For many years, the separation of tantalum from niobium involved the fractional crystallization of potassium heptafluorotantalate away from potassium oxypentafluoroniobate monohydrate, this method has been supplanted by solvent extraction from fluoride-containing solutions by the use of solvent extractants such as Octanol, bis(2-ethylhexyl)phosphoric acid (DEHPA), Alamine 336, methyl isobutyl ketone (MIBK), tri-nbutyl phosphate (TBP) or cyclohexanone. A detailed review of the various processes involved in the breakdown treatment of niobium and tantalum primary sources, extraction and separation and newer processes of extraction as well as the various technique involved were discussed.
- TIC, Tantalum and Niobium-Early History. http://tanb.org/history, retrieved on 30/10/2009.
- Wikipedia, the free encyclopedia, Niobium. http://en.wikipedia.org/wiki/Niobium, retrieved on 05/10/2009.
- V. Erick (2007) Coltan - Columbo tantalite, http://www.eurosinolink.com/pdf/sdpm003v1coltan.pdf, retrieved 28/09/2009.
- Tantalum, http://rsc.org/Chemsoc/VisualElements/pages/pdf/tantalum.PDF, retrieved 28/09/2009
- N. Thakur (2009) Niobium and Tantalum, http://knol.google.com/k/narayan-thakur/niobiumand- tantalum/2kwb871ek26nr/66, retrieved on 23/09/2009.
- Wikipedia, the free encyclopedia, Coltan. http://en.wikipedia.org/wiki/Coltan, retrieved on 23/09/2009.
- C. K. Gupta, A. K. Suri (1994) Extractive Metallurgy of Niobium, CRC Press, pp. 1-16, ISBN 0849360714.
- Wikipedia, the free encyclopedia, Reduction http://en.wikipedia.org/wiki/Reduction, retrieved on 23/09/2009.
- http//:www.bungah@rpi.edu School of Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, 2001
- D. J. Soisson, J. J. McLafferty, J. A. Pierret (1961) Staff-Industry Collaborative Report, Tantalum and Niobium Industrial and Engineering Chemistry, 53 (11), 861–868.
- A. Agulyansky (2004) The Chemistry of Tantalum and Niobium Fluoride Compounds, Elsevier, pp. 1–11. ISBN 9780444516046.
- Y. Y. Vin , S. M Khopkar (1991) Separation of niobium and tantalum by extraction chromatography with bis(2-ethylhexyl)phosphoric acid, Talanta, 38 (9), 971-5.
- O. M. El hussaini, N. M. Rice (2004) Liquid-liquid extraction of niobium and tantalum from aqueous sulphate/fluoride solutions by a tertiary amine, Hydrometallurgy, 72, 259-267. ISSN 0304-386X.
- H. H. Htet, T. L. Kay (2008) Study on Extraction of Niobium Oxide from Columbite– Tantalite Concentrate, World Academy of Science, Engineering and Technology, 46, 133-135.
- Free patents online, Process for the recovery and separation of tantalum and niobium. United States Patent 5209910 http://www.freepatentsonline.com/5209910.html, retrieved on 30/10/2009.
- Jainex Industrial Corporation, Tantalum (Ta), http://jainexmetals.com/tantalum.htm, retrieved on 30/10/2009.
- A. D. Damodaran, S. G. Deshpande, A. A. Majmudar and M. S. Sastri (1969) Extraction and Utilization of Pure Niobium and Tantalum from Indian Ores. Bhabha Atomic Research Center, Trombay, Bombay, 36, No. 5, pp. 306-318.