Demineralization of Enugu coal: effect of acid type and acid concentration

Okoro, S.E.; Asadu, Christian O.; Onoh, Ikechukwu Maxwell

doi:10.1080/22243682.2018.1522971

Cited by 3 publications

(3 citation statements)

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“…The proximate analysis revealed that eliminating mineral matter from coal demineralization has a high potential as indicated by other studies (Manoj and Elcey, 2010;Manoj et al, 2009;Okoro, Asadu, and Maxwell, 2018;Usman et al, 2019) and is appropriate coal for solid fuel combustion. The proximate and ultimate analyses of the undemineralization and demineralization coal samples are presented in Table 1.…”

Section: Results Of Proximate and Ultimate Analysesmentioning

confidence: 64%

“…On the coal matrix, a SEM image shows a scattered network of distributed small crystallites, indicating the existence of mineral phases (Behera et al, 2017). In other studies, it was reported that (Okoro et al, 2018) The presence of lithophytes such as magnesium, aluminum, silicon, calcium, titanium, and sidrophile, such as iron, is indicated by the bright luminosity, while the presence of chalcophiles such as lead, chromium, cadmium, arsenic, mercury, copper, zinc, and other metals is indicated by the dark luminosity. Figure 2 shows the SEM micrographs at different magnification the undemineralized and demineralized coal.…”

Section: Results Of Sem Imagesmentioning

confidence: 92%

“…It was claimed that a successful sequential two-stage alkali-acid leaching eliminated these contaminants from coal to a great extent (Deb Barma et al, 2021) and the dominant ash impurities in high-ash coal are silica (SiO 2 ) and alumina (Al 2 O 3 ). Demineralization of Enugu coal was reported (Okoro et al, 2018), and the filtrate was analyzed with Atomic Absorption Spectrophotometer (AAS), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectrophotometer (EDX), X-ray Fluorescence (XRF), and Fourier Transform Infrared Spectroscopy (FTIR) however, the mineralogy and physiochemical properties of the coal were not reported. The reduction of the ash and sulphur contents of the Nigerian Akunsa coal was investigated (Shi et al, 2020) without reporting any characterization of the filtrate.…”

Section: Introductionmentioning

confidence: 99%

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Demineralization and Characterization of Coal Deposit Found in Maiganga, Akko Local Government, Gombe State, Nigeria

Silas¹

2023

AJBAR

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The characterization of coal provides valuable information on its composition, environmental effects, and applications. This study investigates the leachate elemental composition, physicochemical properties, morphology, mineralogy, functional groups, and thermal behaviour of the demineralised and demineralized coal deposits in Maiganga, Gombe State. Three modes of coal demineralization including mixed acid-alkali, acid, and alkali demineralization were tested. The quantified carbon indicates the hierarchy of leachates in order; HCl+ NaOH Washed > NaOH Washed> HCl Washed (70.38%>64.42%>60.39%). The microstructure images showed crystallites on the coal matrix indicating the presence of mineral phases found abundant in the demineralised sample compared to the demineralized coal. Also, the compositions of demineralised coal appeared in oxide form while that of demineralized coal is elemental because the chemical treatment effects during demineralization dissolute the oxides. The FTIR spectra demonstrate different aliphatic –CH bonds in both samples indicating the Maiganga coal as sub-bituminous coal with high carbon content. The phases in the demineralised coal sample are SiO2, PbCO3, CaO, and Mg2Al2SiO5(OH)4 and for the demineralized sample, the phases are Ca4I8 O24, SiO2 and PbCO3. For efficient high-energy recovery the temperature of >848.2 oC is required as demonstrated by the two samples in thermal analysis, the Temperature Profile Characteristics (TPC) for the samples differ. Furthermore, the comprehensive combustion characteristics parameters indicated a higher and better combustion performance by the demineralized coal (2.4 x10-7 min-2 C-3) compared to the undemineralized coal (1.0 x10-9 min-2 C-3) sample. This finding demonstrated that mining the Maiganga coalfield may not pose threats to humans and the environment, and the coal is suitable for electricity generation.

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Section: Results Of Proximate and Ultimate Analysesmentioning

confidence: 64%

Section: Results Of Sem Imagesmentioning

confidence: 92%