Quantitative phase analysis of bidi-koum bauxites (Guinea)

Frank Feret, Montque Authier-Martin, István Sajó

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Fifty-two Bidi-Koum bauxites from Guinea, Africa, of divesified chemical composition were characterized for their mineral composition. First, 14 element oxide concentration 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 intial 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, gibbsite 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.

Original languageEnglish
Pages (from-to)418-427
Number of pages10
JournalClays and Clay Minerals
Issue number3
Publication statusPublished - Jan 1 1997



  • Bauxite
  • Boehmite
  • Gibbsite
  • Goethite
  • Hematite
  • Quantitative Phase Analysis
  • Wet Chemistry
  • X-ray Diffraction
  • X-ray Fluorescence

ASJC Scopus subject areas

  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)

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