Petrographic and geochemical characterization of the Upper Cretaceous coal and mudstones of Gombe Formation, Gongola sub-basin, northern Benue trough Nigeria: Implication for organic matter preservation, paleodepositional environment and tectonic settings

Ayinla, Habeeb A.; Abdullah, Wan Hasiah; Makeen, Yousif M.; Abubakar, M.; Jauro, Aliyu; Yandoka, Babangida M. Sarki; Abidin, Nor Syazwani Zainal

doi:10.1016/j.coal.2017.06.010

Cited by 31 publications

(15 citation statements)

References 55 publications

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“…However, this requires comprehensive characterisation of the fuel and energy properties of the nation's coal resources, particularly the newly discovered deposits around the country. It is envisaged that the findings will contribute to the existing literature on the geology and geochemistry (Ayinla et al 2017b;Akinyemi et al 2020a), petrology and petrography (Wuyep and Obaje 2012;Ayinla et al 2017a), mineralogy and sedimentology (Ogala et al 2012;Sonibare et al 2013) of selected Nigerian coals in the literature. Other studies have critically examined the physicochemical (Akinyemi et al 2020a), thermal and kinetic properties (Sonibare et al 2005;Nyakuma et al 2016) of selected Nigerian coals.…”

Section: Introductionmentioning

confidence: 85%

Physicochemical, Mineralogy, and Thermo-Kinetic Characterisation of Newly Discovered Nigerian Coals under Pyrolysis and Combustion Conditions

Nyakuma

Jauro

Akinyemi

et al. 2020

Preprint

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In this study, the physicochemical, microstructural, mineralogical, thermal, and kinetic properties of three (3) newly discovered coals from Akunza (AKZ), Ome (OME), and Shiga (SHG) in Nigeria were examined for potential energy recovery. Physicochemical analysis revealed high combustible but low levels of polluting elements. The higher heating values (HHV) ranged from 18.65 MJ/kg (AKZ) to 26.59 MJ/kg (SHG). Microstructure and mineralogical analyses revealed particles with a rough texture, surfaces, and glassy lustre, which could be ascribed to metals, quartz, and kaolinite minerals. The major elements (C, O, Si, and Al), along with minor elements (Ca, Cu, Fe, K, Mg, S, and Ti) detected are associated with clays, salts, or the porphyrin constituents of coal. Thermal analysis showed mass loss (M L ) ranges from 30.51% – 87.57% and residual mass (R M ) from 12.44% – 69.49% under combustion (oxidative) and pyrolysis (non-oxidative) TGA conditions due to thermal degradation of organic matter, vitrinite, inertinite and liptinite macerals. Kinetic analysis revealed that the coal samples are highly reactive under the non-isothermal oxidative and non-oxidative conditions based on the Coats-Redfern Model. The activation energy ( E a ) ranged from 23.81 kJ/mol – 89.56 kJ/mol whereas the pre-exponential factor ( k o ) ranged from 6.77×10 -04 min -1 – 1.72×10 03 min -1 under pyrolysis and combustion conditions. In conclusion, the coals are practical feedstocks for either industrial applications or energy recovery.

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Section: Introductionmentioning

confidence: 85%

Physicochemical, Mineralogy, and Thermo-Kinetic Characterisation of Newly Discovered Nigerian Coals under Pyrolysis and Combustion Conditions

Nyakuma

Jauro

Akinyemi

et al. 2020

Preprint

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“…The research was completed using geological research methods of identification of the sedimentary environment using petrographic analysis which included observations, physical characteristics, and data measurements using petrographic analysis and a geochemical approach (Potter, 1967;Pozo, et al, 2016;Ayinla, et al, 2017;Nabhan and Yang, 2018). This research was completed by observation and investigation from the geological field investigation on December 2015 in Okinawa, Japan and Sadranan, Yogyakarta on May, 2016.…”

Section: Methodsmentioning

confidence: 99%

Comparative characteristics of cement materials in natural and artificial beachrocks using a petrographic method

Daryono

Titisari

Warmada

et al. 2018

Bull Eng Geol Environ

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Beachrock is among the important features of tropical coastlines. It appears to have an anchoring effect on dynamic islands that provides protection from erosion. However, the origin of cement micritic peloidal remains uncertain. Petrographic analysis is a method used by many geologists to accurately identify specific aggregated minerals present in an area. It also helps to understand historical petrogenesis interpretations of a sedimentary rock formation and cementation process inside rock particles. In this study, petrographic analysis was used to identify the structure, texture, composition, and presence of minerals from beachrock samples collected from Okinawa, Japan and Sadranan beach, Yogyakarta, Indonesia. Field investigations and laboratory analysis (petrographic and geochemical measurements) were aimed at understanding the formation mechanism of natural fresh beachrock. Subsequently, laboratory-scale experiments on artificial beachrock were based on solidification tests and were conducted to use microbial-induced calcium carbonate precipitation (MICP) with Pararodhobacter and Ocenisphaera bacterium species to draw comparisons between natural beachrock and artificial beachrock. The cementation process based on petrographic analysis of thin sections has an assumption that the cement type and other added materials determine the strength of the material, and that the cement mineral occurring represents the sedimentary environment. The cement mechanism behavior of natural beachrock has potential in manufacturing artificial beachrock using the MICP method, an eco-friendly development method for coastal areas.

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“…In addition, the outlined properties of coal provide insights into the thermal degradation behaviour, emissions profile, and potential environmental impact during energy recovery and electricity generation in power plants. However, the data on various Nigeria coals is limited to the geological, geochemical, petrographic, petrologic, sedimentology, and mineralogical properties as reported in the literature (Ayinla et al, 2017;Ogala, 2018;Akinyemi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

<em></em>Energy Recovery Potential of Obomkpa Coal

Nyakuma¹

2020

Preprint

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This study presents preliminary findings on the physicochemical, calorific, and thermal properties of a newly discovered coal from Obomkpa town in Aniocha-North Local Government Area of Delta State in Nigeria. The Obomkpa (BMK) coal sample was subjected to fuel characterisation through ASTM standards and techniques for determining elemental, proximate, and calorific coal properties. The results indicated that BMK coal contains high carbon, oxygen, volatile matter, fixed carbon, and ash. The higher heating value of BMK was 19.66 MJ/kg, which indicates it could be ranked as either lignite A or subbituminous C coal. The thermal properties indicated that BMK experienced significant mass loss (ML) under oxidative (combustion) and non-oxidative (pyrolysis) conditions due to thermal degradation of organic rock macerals (inertinite and vitrinite). Furthermore, BMK experienced mass loss (ML=59.27%–76.56%) along with residual mass (RM = 23.44–40.73%) under oxidative (combustion) and non-oxidative (pyrolysis) conditions. Thermal degradation occurred in three (3) stages; drying (30 °C to 200 °C), devolatilization (200 °C – 500 °C and 600 °C), and lastly, coke degradation and ash formation. Furthermore, the DTG peaks for the drying and devolatilization of BMK during the oxidative (combustion) process occurred at lower temperatures compared to the non-oxidative (pyrolysis) process. Hence, the results submit oxidative (combustion) is a more thermally efficient process compared to the non-oxidative (pyrolysis) process. Lastly, the findings indicate BMK is a potential feedstock material for future coal power generation, steel, iron ore or cement production.

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Petrographic and geochemical characterization of the Upper Cretaceous coal and mudstones of Gombe Formation, Gongola sub-basin, northern Benue trough Nigeria: Implication for organic matter preservation, paleodepositional environment and tectonic settings

Cited by 31 publications

References 55 publications

Physicochemical, Mineralogy, and Thermo-Kinetic Characterisation of Newly Discovered Nigerian Coals under Pyrolysis and Combustion Conditions

Physicochemical, Mineralogy, and Thermo-Kinetic Characterisation of Newly Discovered Nigerian Coals under Pyrolysis and Combustion Conditions

Comparative characteristics of cement materials in natural and artificial beachrocks using a petrographic method

<em></em>Energy Recovery Potential of Obomkpa Coal

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