Trace and major metal abundances in the shale and coal of various seams at Okaba coal mine, Kogi State, Nigeria

Abstract

The distribution of a number of trace and major elements in the shale and coal of differing seams in Okaba, Kogi State, Nigeria, was studied using energy dispersive x-ray fluorescence spectrometer. The study was necessary to compare the quality of Okaba coal to world standards of coal quality. Major elements of Al, K, Ca and Fe showed concentration ranges of 5.93±2.49-8.42±0.003 mg/g, 0.18±0.46-2.16±0.0 mg/g, 0.53±0.41-2.23±0.35 mg/g and 6.05±0.004-18.28±1.2 mg/g respectively. The mean concentrations are 7.24mg/g (Al), 1.25 mg/g (K), 0.91 mg/g (Ca) and 11.86 mg/g (Fe). These values are clearly above the recommended concentrations in coal quality standards and for air emission standards by the World health organization. Trace metals of Ti, Cr, Mn, V, Ni and Cu showed concentration range of 0.84±0.

Geochemistry and multivariate statistical evaluation of major oxides, trace and rare earth elements in coal occurrences and deposits around Kogi east, Northern Anambra Basin, Nigeria

“…The basin is a sedimentary succession that directly overlies the facies of the Lower Benue trough and consists of Campanian to early Palaeocenelithofacies (Adebayo et al 2015). Several works on the Palaeoenvironment, palaeogeography, sedimentary tectonics, coal deposits and lithostratigraphy have been carried out (Nwajide and Reijers 1996;Akandeet al 2007;Ogala et al 2009Ogala et al , 2010Onyekuru and Iwuagwu 2010;Okorie and Egila 2014;Akinyemi et al 2014;Uzoegbu et al 2014;Adebayo et al 2015). Sediments deposition within the Anambra Basin started during the Campanian, with Nkporo and Enugeshales constituting the basal beds of the Campanian period.…”

“…Lignite deposits occur in numerous seams in an east-west belt to the southwest (Simpson 1954;Uzoegbu et al 2014). A number of studies (Obaje et al 1999;Reyment 1965;Akande et al 1992Akande et al , 2007Okorie and Egila 2014) have been conducted on the stratigraphic succession, organic and inorganic geochemistry of coal, distribution and abundance of coal in Anambra Basin. Previous work has also been carried out on the trace elements in coal in the study area (Olajire et al 2007;Ndiokwere et al 1983;Sonibare et al 2005;Ewa 2004;Ogala et al 2009Ogala et al , 2010.…”