Browsing by Author "Onyeobi, T.U.S."

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    Compositional Characteristics and Industrial Assessment of the Asu River Group Shale in Mpu Area, Southeastern Nigeria
    (Department of Geology and Minning, Nasarawa State University Keffi, 2012-03-08) Obrike, Stephen E.; Onyeobi, T.U.S.; Anuda, G.K.; Osadebe, C.C.
    Compositional and physical characteristics of the shale from Mpu, south-eastern Nigeria, were assessed to evaluate their potential as industrial raw materials. The mineralogical determination by x-ray diffraction (XRD) of the shale, indicate kaolinite as the major clay mineral with diffused peaks of illite and smectite, with quartz as the non-clay mineral. Chemical analysis of the samples reveals the predominance of SiO2 (58.62- 59.80) and Al2O3 (21.23- 22.10) with a silica/alumina ratio of 2.51.The shale is also characterized by significant Fe2O3 (1.62 - 3.68), TiO2 (1.48 - 1.56), K2O (1.64 - 1.78) values, while CaO, MgO, Na2O, MnO and P2O5 have individual values < 1%. Samples from the study area are essentially made up of clay fractions (<65µm) above 70%, some of the physical parameters of the shale specimens include linear shrinkage (4.80-5.20), plastic limit (22.0-27.0), liquid limit (53.0- 58.0), plasticity index (28.0-34.0) and loss on ignition (9.50-9.80) values. Mineralogical and chemical compositions suggest that the shale deposit could be exploited for ceramics, paint, pottery and refractory industries.
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    Mineralogical, geochemical, physical and industrial characteristics of shale from Okada area, southwestern Nigeria
    (Department of Geology and Minning, Nasarawa State University Keffi, 2007-01-09) Obrike, Stephen E.; Osadebe, C.C.; Onyeobi, T.U.S.
    '•؛:neralogical, geochemical and physical characteristics of the shale from Okada, southwestern Nigeria, were determined to evaluate its industrial potential. The x-ray analysis of the shale shows prominent quartz, kaolinite and mixed layer peaks. The result of the chemical analysis shows the predominance of SiOj (55,71% to 55.84%) and Al o (20.58% to 20.70%) with silica/ alumina ratio of 2.71. This clearly defines the shale as alumino-silicates. The other significant chemical impurities m the clay- shale arc 0,70) ه ع%), TiO, (1.15%) and N aO (2.0%). Mineralogical and chemical compositions 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 shلا e is also characterized by high loss on Ignition (16.8%).