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Quantitative Phase Analysis of Bidi-Koum Bauxites (Guinea)

Published online by Cambridge University Press:  28 February 2024

Frank Feret ,
Monique Authier-Martin  and
István Sajó
Frank Feret
Affiliation:
Alcan International Ltd, Arvida Research and Development Centre, Jonquière, Québec, Canada G7S 4K8
Monique Authier-Martin
Affiliation:
Alcan International Ltd, Arvida Research and Development Centre, Jonquière, Québec, Canada G7S 4K8
István Sajó
Affiliation:
Bay Zoltan Institute for Materials Science and Engineering, H-1116 Budapest, Fehervati ut 130, Hungary
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Abstract

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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.

Keywords

BauxiteBoehmiteGibbsiteGoethiteHematiteQuantitative Phase AnalysisWet ChemistryX-ray DiffractionX-ray Fluorescence
Type
Research Article
Information
Clays and Clay Minerals , Volume 45 , Issue 3 , June 1997 , pp. 418 - 427
Copyright
Copyright © 1997, The Clay Minerals Society

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