Abstract
ABSTRACT The results of a study aimed at evaluating the mineral constituents of four Nigerian coals (a Iignite, a subbituminous and two high volatile bituminous coals) are reported in this paper. The low temperature ash (LTA) obtained from the coals was analyzed using scanning electron microscopy (SEM) and x-ray diffraction (XRD). X-ray fluorescence spectra obtained from SEM showed the presence of silica, alumina, iron- and titanium-containing minerals in smaller amounts, and exchangeable cations (Ca, K, Na) in the four coals. The concentration of exchangeable cations and alumina was found to increase with increase in coal rank. X-ray diffraction results indicated the presence of quartz, kaolinite and pyrite in all four coals; calcite and marcasite only in the lignite; and anorthite only in the bituminous coal; albite and gypsum in all except lignite; and montmorillonite in the low rank coals only.
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