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Characterization of Kaolin Deposits in Okpella and Environs, Southern Nigeria

International Journal of Geosciences 2019年第3期10卷 317-327页

作者： Benjamin Odey Omang ebenezer agayina kudamnya Ayodele Olumiyiwa Owolabi Joseph Odey Emmanuel Ude Aniwetalu Thomas Agbor Ako Department of Geology University of Calabar Calabar Nigeria Department of Mining Engineering Federal University of Technology Akure Nigeria Department of Pure and Applied Chemistry University of Calabar Calabar Nigeria Department of Geological Sciences Nnamdi Azikiwe University Awka Nigeria Department of Geology Federal University of Technology Minna Minna Nigeria

Kaolin is one of the most important industrial minerals whose application is dependent on its structure and chemical composition. This study makes an attempt to explore and determine the origin of kaolin deposits within and around Okpella, as well as to investigate the mineralogical and chemical compositions using the X-ray diffraction (XRD) and X-ray fluorescence (XRF) method. These were carried out with the intention of determining the most suitable applications for the clay mineral. It was observed that major phases in the clay samples from the three different deposits are kaolinite, microcline, illite/mica, plagioclase/albite and quartz. These phases were observed in varied percentages. Samples from Ajego 2 show a marked absence of kaolinite but contain high concentration of plagioclase feldspar and quartz which permit its usage in the production of glass and iron industries. Further, the samples from Ajego 1 contain by far the highest concentration of kaolinite, while the samples from Anegha consist of kaolinite, a mixed layer of illite/mica, plagioclase, alkali feldspars, and albite which is necessary for producing mullite fibers in ceramic matrix at a temperature of around 1400°C and it is suitable in pigment production. The XRF result for Ajego2 and Anegha samples has Silica composition of 51.847 wt%, 32.540 wt% and 37.295 wt% respectively and an alumina content of 14.962 wt%, 29.834 wt% and 20.227 wt% respectively. The trace amount of some of the oxides such as K2O, TiO2, Fe2O3 and SnO2 can help in the beneficiation process.

关键词： Kaolin Mineral Characterization XRD XRF Okpella

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Assessment of Heavy Metals Concentration and Enrichment Levels in Soils around Quarries and Barite Mine Sites in Part of Akamkpa and Biase Area, Southeastern Nigeria

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Journal of Geoscience and Environment Protection 2020年第8期8卷 107-128页

作者： Ibu Ochelebe Gordon Essien Nkebem Ebenezar agayina kudamnya Department of Geology University of Calabar Calabar Nigeria

Geochemical investigation of the soils around quarry and barite mine sites in part of Akamkpa and Biase area of Southeastern Nigeria, was carried out to assess the concentration and enrichment levels of some heavy metals and trace elements in the soils. The investigation involved the collection of fifteen (15) soil samples between the depth of 15 - 30 cm. The samples were dried at room temperature, prepared and analyzed for heavy metals using inductively couple plasma mass spectrometer. The result shows that the concentration of Co, Cr, Nb, Pb and Sn were higher than the average shale values around the quarries while Ba, Pb and Sn were higher around the barite mines. The contamination factor indicates low to minimal contamination and low to considerable contamination around the quarries and barite mines respectively. While the Enrichment factor indicates minimal to significant enrichment around the quarries and minimal to extremely high enrichments around the barite mines. The result of the factor analysis and spatial distribution of the heavy metals suggests that the metal concentration and enrichment were controlled by the rock types, weathering and anthropogenic activities around the mine sites.

关键词： Heavy Metal Quarry Barite Mine Enrichment Factor Contamination Factor

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