Abstract
Fifty-two Bidi-Koum bauxites from Guinea, Africa, of diversified chemical composition were characterized for their mineral composition. First, 14 element oxide concentrations were determined by X-ray fluorescence (XRF) using a fusion sample preparation technique. Loss of Mass (LOM) and organic carbon (OC) concentrations were also determined. The initial X-ray diffraction (XRD) phase quantification was carried out employing XDB software. This software allows for full interpretation of a sample diffractogram and helps generate initial concentrations of identified minerals based on a standardless approach. In the stage that followed, the mass balance procedure on the XDB software helped refine the final phase composition. Then, gibbsitic Al2O3 concentrations obtained by wet chemistry for all samples and kaolinitic SiO2 concentrations obtained for selected samples were compared with the concentrations obtained using the XDB software. Phases that were quantified are: gibbsite, boehmite, kaolinite, wavellite, goethite, hematite, quartz, anatase, rutile and illite. Phase concentrations were obtained for illite from K2O and for wavellite from P2O5 concentrations. The alumina substitution in the goethite lattice was also estimated.
Similar content being viewed by others
References
Andrews WH, Crisp AJ. 1980. Correlation of bauxite analysis with mineralogy. Light Met, AIME:3–18.
Bárdossy G., et al. 1980. Automated quantitative phase analysis of bauxites. Am Mineral 59:59–141.
Black HR. 1953. Analysis of bauxite exploration samples. Anal Chem 25:25–748.
Boski T, Herbillon AJ., 1988. Quantitative determination of hematite and goethite in lateritic bauxites by thermodifferential X-ray powder diffraction. Clays Clay Miner 36:36–180.
Bredell JH. 1983. Calculation of available alumina in bauxite during reconnaissance exploration. Econ Geol 78:78–325.
Feret F, Giasson GF. 1991. Quantitative phase analysis of Sangaredi bauxites (Guinea) based on their chemical composition. Light Met, AIME:187–191.
Feret F. 1993. Application of XRF in the aluminum industry. Adv X-ray Anal 36:36–137.
Hill RJ. 1992. Applications of Rietveld Analysis to materials characterization in solid-state chemistry, physics and mineralogy. Adv X-ray Anal 35:25–37.
King WR. 1971. The iron minerals in Jamaican bauxites. Light Met, AIME:3–18.
Montgomery O, deFoggi D. 1983. Rapid phase and chemical analysis. Light Met, AIME:15–20.
Ni LP, Khalyapina OB. 1978. Physical-chemical properties of the raw materials and products of alumina production. Alma-Ata, Kazakhstan: Izdatielstvo Nauka. 252 p.
Norrish K, Taylor RM. 1961. The isomorphous replacement of iron by aluminum in soil goethites. J Soil Sci 12:294.
Sajo I. 1994. Powder diffraction phase analytical system, Version 1.7, Users Guide. Budapest: Aluterv-FKI Ltd. 81 p.
Schorin H, Carias O. 1987. Analysis of natural and beneficiated ferruginous bauxites by both X-ray diffraction and X-ray fluorescence. Chem Geol 60:60–204.
Solymár K, Sajó I, Steiner J, Zöldi J. 1991. Characteristics and separability of red mud. Light Met, AIME:209–223.
Strahl EO. 1982. Modern analytical methods in bauxite survey programs. In: Lyew-Ayee A, editor. Proc 5th Bauxite Symp. 188–203.
Taylor JC. 1991. Computer programs for standardless quantitative analysis of minerals using the full powder diffraction profile. Powder Diffr 6:6–9.
Thiel R. 1963. Goethite-diaspore system. Z Anorg u Allg Chem 326:326–78.
Verghese KI. 1987. The impact of impurities on the Bayer process. 8th Int Leichtmetalltagung; 1987; Leoben-Wien. p 42–46.
Young RA. 1993. The rietveld method. New York: Oxford Univ Pr., 298 p.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Feret, F., Authier-Martin, M. & Sajó, I. Quantitative Phase Analysis of Bidi-Koum Bauxites (Guinea). Clays Clay Miner. 45, 418–427 (1997). https://doi.org/10.1346/CCMN.1997.0450311
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1346/CCMN.1997.0450311