Extraction of vanadium from athabasca tar sands fly ash
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The production of refinery grade oil from the Alberta tar sands deposits as currently practiced by Suncor (formally Great Canadian Oil Sands Ltd.—GCOS) generates a substantial amount of petroleum coke fly ash which contains appreciable amounts of valuable metals such as vanadium, nickel and titanium. Although the recovery of vanadium from petroleum ash is a well established commercial practice, it is shown in the present work that such processes are not suitable for recovery of vanadium from the GCOS fly ash. The fact that the GCOS fly ash behaves so differently when compared to other petroleum fly ash is attributed to its high silicon and aluminum contents which tie up the metal values in a silica-alumina matrix. Results of experiments carried out in this investigation indicate that such matrices can be broken down by application of a sodium chloride/water roast of the carbon-free fly ash. Based on results from a series of preliminary studies, a detailed investigation was undertaken in order to define optimum conditions for a vanadium extraction process. The process developed involves a high temperature (875 to 950 °C) roasting of the fly ash in the presence of sodium chloride and water vapor carried out in a rotary screw kiln, followed by dilute sodium hydroxide atmosphereic leaching (98 °C) to solublize about 85 pet of the vanadium originally present in the fly ash. It was found that the salt roasting operation, besides enhancing vanadium recovery, also inhibits silicon dissolution during the subsequent leaching step. The salt roasting treatment is found to improve vanadium recovery significantly when the fly ash is fully oxidized. This is easily achieved by burning off the carbon present in the “as received” fly ash under excess air. The basic leaching used in the new process selectively dissolves vanadium from the roasted ash, leaving nickel and titanium untouched.
- J. E. Gonzalez and E. Martinez:Determination de Elementes Metalicos en Petroleos Venezolanos y Preparacion de Pentoxidode Vanadio a partir De Cenizas de Crudos Redisuales, Min. Minase Hidrocarburos, Centro de Evaluacion, Carcaras, Venezuela, 1969.
- J. A. Vezina and W. A. Gow: Technical Bulletin TB 63, Department of Energy, Mines and Resources, Ottawa, Canada, 1965.
- A. J. O’Neal, Jr.:Combustion, 1974, vol. 46, no. 5, pp. 18–21.
- A. Stemerowicz, R. W. Bruce, G. V. Sirianni and G. E. Viens:CIM Bulletin, 1976, vol. 69, no. 768, pp. 102–8.
- L. A. Walker: Great Canadian Oil Sands, Edmonton, Alberta, private communication, July 1976.
- L. A. Walker, R. W. Luhning and K. Rashid:Potential for Recovering Vanadium from Athabasca Tar Sands, Symposium on Tar Sands, 26th Canadian Chemical Engineering Conference, Toronto, 1976. Preprint volume of papers presented Canadian Society for Chemical Engineering, Ottawa, Canada.
- P. M. Busch: Report IC 8060, U.S. Bureau of Mines, Washington, D.C., 1961.
- H. Ottertun and S. Strandell:Solvent Extraction of Vanadium (IV) with D2EHPA and TBP, International Solvent Extraction Conference, Toronto, 1977. Proceedings, ISEC 77, vol. 2, pp. 501-16, CIM Special Volume 21, 1979, The Canadian Institute of Mining and Metallurgy, Montreal, Canada.
- W. Whigham:Chem. Eng., 1965, vol. 72, no. 5, pp. 64–66.
- C. O. Gomez-Bueno, G. L. Rempel, and D. R. Spink:CIM Bulletin, 1980, vol. 73, no. 820, pp. 147–51.
- H.H. Reinhardt:Waste Treatment and Utilization—Theory and Practice of Waste Management, pp. 83–93, M. Moo-Young and G. J. Farquhar, eds., Pergamon Press, New York, 1979.
- W. W. Hanf and M. J. Sole:Trans. Faraday Soc, 1970, vol. 66, pp. 3065–74. CrossRef
- C. O. Gomez-Bueno, G. L. Rempel, and D. R. Spink: Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, Canada, unpublished research, 1980.
- J. R. Boldt, Jr., and P. Quenau:The Winning of Nickel, Section 4, Longmans Canada Ltd., Toronto, 1967.
- M. H. Caron:Trans. AIME, 1950, vol. 188, pp. 67–90.
- F. Habashi:Principles of Extractive Metallurgy, vol. 2, pp. 57–96, Gordon and Breach, New York, 1970.
- S. Seimiya: inExtractive Metallurgy of Aluminum, vol. 1, p. 115, G. Gerard and P. T. Stroup, eds., Interscience Publishers, New York, 1963.
- W. G. Cochran and G. M. Cox:Experimental Design, 2nd ed., Chapter 5, John Wiley & Sons, New York, 1957. 353
- Extraction of vanadium from athabasca tar sands fly ash
Metallurgical Transactions B
Volume 12, Issue 2 , pp 341-352
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