Mineralogical, Geochemical, Physical And Industrial Potentials Of Shale From Okada Area, Southwestern, Nigeria
2008
Obrike, S E | Osadebe, C C | Onyeobi, T U
Mineralogical, geochemical and physical characteristics of the shale from Okada, Southwestern Nigeria were evaluated to determine its industrial potentials. The x-ray analysis of the Okada shale shows prominent quartz, kaolinite and mixed layer peaks. The result of the chemical analysis shows the predominance of SiO2 (55.71% to 55.84%) and Al2O3(20.58% to 20.70%) and silica/alumina ratio of 2.71. This clearly defines the shale as alumino-silicates. The other significant chemical impurities in the Okada clay-shale are Fe2O3 (0.70%), TiO2 (1.15%) and Na2O (2.0%). Mineralogical and chemical compositions of the shale in Okada suggest that the deposit could be exploited for ceramic, pottery and refractory industries. A small amount of montmorillonite in the clay results in high plasticity (74% – 85%) and shrinkage limit (8.30 – 8.70%) as well as low vitrification. The shale is also characterized by high loss on ignition (16.8%). Keywords: mineralogy, chemical, physical, industrial potential, shaleJournal of Mining and Geology Vol. 43 (2) 2007: pp. 109-116
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