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The quantification of lateritic bauxite minerals using X-ray powder diffraction by the Rietveld method

Published online by Cambridge University Press:  10 January 2013

Mark G. Aylmore  and
Graham S. Walker
Mark G. Aylmore
Affiliation:
Special Research Centre for Advanced Mineral and Materials Processing, University of Western Australia, Nedlands, Western Australia, 6907, Australia
Graham S. Walker*
Affiliation:
CSIRO Division of Minerals, P.O. Box 90 Bentley, Western Australia, 6102, Australia
*
a) Author to whom all correspondence should be sent.
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Abstract

The application of the Rietveld method to quantify mineral components of bauxite and lateritic samples was carried out in order to determine the ability of the method to obtain accurate mineralogical abundances for these materials. The method was initially applied to synthetic mixtures using both Cu and Co Kα radiations, and it was shown that Rietveld-derived data compared favourably with the weighed compositions. Application to two types of natural bauxite resulted in a high correlation between Rietveld predicted values and those calculated by proportioning peak intensities with chemical assays. The use of the whole pattern rather than selected peak intensities gives greater accuracy, confirmed by a strong correlation between derived oxide concentrations from XRF assays. Accuracy and precision were improved by the determination of isomorphous substitution of aluminum in goethite and hematite by refinement of unit cell dimensions. Importantly, the ability of the Rietveld program to successfully model several goethites with different levels of isomorphous substitution improved the correlation between predicted and calculated values. In addition, crystallinity and crystallite size that influence the reactivity of the mineral components can be derived from refined peak profiles.

Keywords

Rietveldlateritebauxitequantification
Type
Research Article
Information
Powder Diffraction , Volume 13 , Issue 3 , September 1998 , pp. 136 - 143
Copyright
Copyright © Cambridge University Press 1998

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References

Anand, R. R., Gilkes, R. J., and Roach, G. I. D. (1989). “Geochemical and Mineralogical Characteristics of Bauxites, Darling Range, Western Australia,” Appl. Geochem. 6, 233–248.Google Scholar
Bardossy, G. Y. (1983). “Comparison of the Main Lateritic Bauxite Regions of our Globe,” in Laterization Process, edited by A. J. Melfi and A. Carvalho, Proceedings of the II International Seminar on Laterization Processes, Brazil (unpublished), pp. 15–51.Google Scholar
Bish, D. L., and Howard, S. A. (1988). “Quantitative Phase Analysis using the Rietveld Method,” J. Appl. Crystallogr. 21, 86–91.Google Scholar
Bish, D. L., and Post, J. E. (1993). “Quantitative Mineralogical Analysis using the Rietveld Full-Pattern Method,” Am. Mineral. 78, 932–940.Google Scholar
Brindley, G. W. (1980). “Quantitative X-ray Mineral Analysis of Clays,” in Crystal Structure of Clay Minerals and their X-ray Identification, edited by G. W. Brindley and G. Brown (Mineralogical Society, London).Google Scholar
Brown, N., and Trembly, R. J. (1974). “Some Studies of Iron Mineral Transformations during High Temperature Digestion of Jamaician Bauxite,” Light Metals 3, 825–844.Google Scholar
Caglioti, G., Paoletti, A., and Ricci, F. P. (1958). “Choice of Collimators for a Crystal Spectrometer for Neutron Diffraction,” Nucl. Instrum. 3, 223–228.CrossRefGoogle Scholar
Dollase, W. A., (1986). “Correction of Intensities for Preferred Orientation in Powder Diffractometry: Application of the March Model,” J. Appl. Crystallogr. 19, 267–272.CrossRefGoogle Scholar
Fazey, P. G., O’Connor, B. H., and Hammond, L. C. (1991). “X-ray Powder Diffraction Rietveld Characterisation of Synthetic Aluminum-Substituted Goethite,” Clays Clay Miner. 39, 248–253.CrossRefGoogle Scholar
Fitzpatrick, R. W., and Schwertmann, U. (1982). “Al-substituted Goethite, an Indicator of Pedogenic and other Weathering Environments in South Africa,” Geoderma 27, 335–347.Google Scholar
Hill, R. J., (1983). “Calculated X-ray Powder Diffraction Data for Phases Encountered in Lead/Acid Battery Plates,” J. Power Sources 9, 55–71.CrossRefGoogle Scholar
Hill, R. J., (1991). “Expanded Use of the Rietveld Method in Studies of Phase Abundance in Multiphase Mixtures,” Powder Diffr. 6, 74–77.Google Scholar
Hill, R. J., and Howard, C. J. (1986). “A Computer Program for Rietveld Analysis of Fixed Wavelength X-ray and Neutron Powder Diffraction Patterns: Version LHPMI,” Australian Atomic Energy Commission, Report No. AAEC/ M112.Google Scholar
Hill, R. J., and Howard, C. J. (1987). “Quantitative Phase Analysis from Neutron Powder Diffraction Data using the Rietveld Method,” J. Appl. Crystallogr. 20, 467–474.Google Scholar
Hill, R. J., Tsambourakis, G., and Madsen, I. C. (1993). “Improved Petrological Modal Analyses from X-ray Powder Diffraction Data by use of the Rietveld Method. Part I. Selected Igneous, Volcanic and Metamorphic Rocks,” J Petrol. 34, 867–900.Google Scholar
King, W. R. (1971). “The Iron Minerals in Jamaician Bauxites,” Light Metals 3, 18–20.Google Scholar
Klug, H. P., and Alexander, L. E. (1974). X-ray Diffraction Procedures for Polycrystalline and Amorphous Materials, 2nd ed. (Wiley, New York).Google Scholar
Krumm, S. (1994). “WINFIT1.0—A Public Domain Program for Interactive Profile-Analysis under WINDOWS,” Proceedings of the XIIIth Conference on Clay Mineralogy and Petrology, Prague, 1994 (unpublished).Google Scholar
Li, D. Y., O’Connor, B. H., Roach, G. I. D., and Cornell, J. B. (1990). “Use of X-ray Powder Diffraction Pattern Fitting for Characterising Preferred Orientation Gibbsites,” Powder Diffr. 5, 79–85.Google Scholar
Madsen, I., and Hill, R. (1990). “QPDA—User-friendly, Interactive Program for Quantitative Phase and Crystal Size/Strain Analysis of Powder Diffraction Data,” Powder Diffr. 5, 195–199.Google Scholar
Nahon, D. C., Janot, C., Karpoff, A. M., Paquet, M., and Tardy, Y. (1977). “Mineralogy, Petrography and Structures of Iron Crusts (ferricretes) Developed on Sandstones in the Western Part of Senegal,” Geoderma 19, 263–277.Google Scholar
O’Connor, B. H., Li, D. Y., and Sitepu, H. (1991). “Strategies for Preferred Orientation Corrections in X-ray Powder Diffraction using Line Intensity Ratios,” Adv. X-Ray Anal. 34, 409–415.Google Scholar
O’Connor, B. H., and Raven, M. D., (1988). “Application of the Rietveld Refinement Procedure in Assaying Powder Mixtures,” Powder Diffr. 3, 2–6.Google Scholar
Perinet, G., and Lafont, R. (1972). “Sur Les Paramèters Cristallographiques des Hématites Alumineuses,” C.R. Acad. Sci. Paris C 275, 1021–1024.Google Scholar
Roach, G. I. D., Aylmore, M. G., Gilkes, R. J., and Anand, R. R. (1989). “Mineralogy and the Grinding and Settling Properties of Western Australian Bauxite,” J. Light Metals 4, 275–280.Google Scholar
Schulze, D. G., (1984). “The Influence of Aluminum on Iron Oxides. VIII. Unit Cell Dimensions of Al-substituted Goethites and Estimation of Al from them,” Clays Clay Miner. 32, 36–44.Google Scholar
Schwertmann, U., Fitzpatrick, R. W., Taylor, R. M., and Lewis, D. G., (1979). “The Influence of Aluminum on Iron Oxides. II. Preparation and Properties of Al-substituted Hematites,” Clays Clay Miner. 27, 105–112.CrossRefGoogle Scholar
Snyder, R. L., and Bish, D. L. (1989). “Quantitative Analysis,”inMiner. Soc. Am. Revi. Miner. 20, 101–144.Google Scholar
Stanjeck, H., and Schwertmann, U., (1992). “The Influence of Aluminum on Iron Oxides. XVI. Hydroxyl and Aluminum Substitution in Synthetic Hematites,” Clays Clay Miner. 40, 347–354.Google Scholar
Taylor, J. C., and Matulis, C. E., (1991). “Absorption Contrast Effects in the Quantitative XRD Analysis of Powders by Full Multiphase Profile Refinement,” J. Appl. Crystallogr. 24, 14–17.CrossRefGoogle Scholar
Taylor, R. M., and Schwertmann, U., (1980). “The Influence of Aluminum on Iron Oxides. VII. Substitution of Al for Fe in Synthetic Lepidocrocite,” Clays Clay Miner. 28, 267–271.CrossRefGoogle Scholar
The Rietveld Method, edited by R. A. Young (1993). (International Union of Crystallography, Oxford University Press, Oxford).Google Scholar
Wegge, S., Thornber, M. R., Darragh, P. J., and Morgan, M. “Characterisation of Selected Bauxites from Cape York Peninsula (Australia),” Miner. Deposita (in press).Google Scholar
Wells, M. A. (1997). “Mineral, Chemical and Magnetic Properties of Synthetic Metal-Substituted Goethites and Hematites,” Ph.D. thesis, University of Western Australia, p. 406.Google Scholar
Wiles, D. B., and Young, R. A., (1981). “A New Computer Program for Rietveld Analysis of X-ray Powder Diffraction Patterns,” J. Appl. Crystallogr. 14, 149–151.Google Scholar