Chemical, mineralogical and morphological investigation of coal fly ash obtained from Mpumalanga Province, South Africa
- Alegbe, John, Ayanda, Olushola Sunday, Ndungu, Patrick, Alexander, Nechaev, Fatoba, Ojo Olanrewaju, Petrik, Leslie Felicia
- Authors: Alegbe, John , Ayanda, Olushola Sunday , Ndungu, Patrick , Alexander, Nechaev , Fatoba, Ojo Olanrewaju , Petrik, Leslie Felicia
- Date: 2018
- Subjects: Coal fly ash , Physicochemical properties , Thermal power plant
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/271555 , uj:28884 , Citation: Alegbe, J., Ayanda, O.S., Ndungu, P., Alexander, N., Fatoba, O.O. & Petrik, L.F. 2018. Chemical, mineralogical and morphological investigation of coal fly ash obtained from Mpumalanga Province, South Africa. Research Journal of Environmental Sciences, 12: 98-105. DOI: 10.3923/rjes.2018.98.105 , ISSN: 1819-3412
- Description: Abstract: Background and Objective: Coal fly ash generated from the combustion of coal by thermal power plant stations are enormous and the disposal there of is a big problem. In the present study, the chemical, mineralogical and morphological characterization of coal fly ash samples (CFAs) obtained from Mpumalanga province, South Africa were investigated. Materials and Methods: The CFAs were characterised by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), high resolution transmission electron spectroscopy (HRTEM) and the selected area electron diffraction (SAED) analytical technique. Result: Experimental results showed that the CFAs contain hematite, magnetite, calcite, lime, mullite and quartz. The CFAs are polycrystalline, could be categorized as class F fly ash and the particles are spherical in shape. Conclusion: The phase characterization suggested that CFA could be used for the synthesis of nanoparticles, as well as extraction of valuable metals, more so, the elemental composition of the CFAs suggested that the storage and disposal of CFAs could lead to the release of salts and toxic elements into the environment, thereby, contaminating surface and ground waters.
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- Authors: Alegbe, John , Ayanda, Olushola Sunday , Ndungu, Patrick , Alexander, Nechaev , Fatoba, Ojo Olanrewaju , Petrik, Leslie Felicia
- Date: 2018
- Subjects: Coal fly ash , Physicochemical properties , Thermal power plant
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/271555 , uj:28884 , Citation: Alegbe, J., Ayanda, O.S., Ndungu, P., Alexander, N., Fatoba, O.O. & Petrik, L.F. 2018. Chemical, mineralogical and morphological investigation of coal fly ash obtained from Mpumalanga Province, South Africa. Research Journal of Environmental Sciences, 12: 98-105. DOI: 10.3923/rjes.2018.98.105 , ISSN: 1819-3412
- Description: Abstract: Background and Objective: Coal fly ash generated from the combustion of coal by thermal power plant stations are enormous and the disposal there of is a big problem. In the present study, the chemical, mineralogical and morphological characterization of coal fly ash samples (CFAs) obtained from Mpumalanga province, South Africa were investigated. Materials and Methods: The CFAs were characterised by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), high resolution transmission electron spectroscopy (HRTEM) and the selected area electron diffraction (SAED) analytical technique. Result: Experimental results showed that the CFAs contain hematite, magnetite, calcite, lime, mullite and quartz. The CFAs are polycrystalline, could be categorized as class F fly ash and the particles are spherical in shape. Conclusion: The phase characterization suggested that CFA could be used for the synthesis of nanoparticles, as well as extraction of valuable metals, more so, the elemental composition of the CFAs suggested that the storage and disposal of CFAs could lead to the release of salts and toxic elements into the environment, thereby, contaminating surface and ground waters.
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Comparative study of two biggest mineral wastes in South Africa for mine reclamation: A geotechnical study
- Gcasamba, S P, Ramasenya, K, Diop, S, Vadapalli, V R K, Ekolu, S
- Authors: Gcasamba, S P , Ramasenya, K , Diop, S , Vadapalli, V R K , Ekolu, S
- Date: 2019
- Subjects: Coal fly ash , Gold mine , Geotechnical characterisation
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/406547 , uj:34185 , Citation: Gcasanba, S.P. et al. 2019 : Comparative study of two biggest mineral wastes in South Africa for mine reclamation: A geotechnical study.
- Description: Abstract : Laboratory investigations were conducted on two mineral wastes to assess their geotechnical properties for mine backfilling. Composite Coal Fly Ash (CFA) sludge recovered from CFA and acid mine drainage (AMD) reaction (ratios 1:2 and 1:3) and gold mine tailings (GMT) with 3 % cement were evaluated at varying curing ages. Both samples showed favourable characteristics for use in mine reclamation. However, solid/liquid ratios should be maintained to ensure maximum strength. The results show that CFA can be recommended for mine reclamation due to it geotechnical properties. The use of GMT is possible, however blending with higher percentages of cement should be considered.
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- Authors: Gcasamba, S P , Ramasenya, K , Diop, S , Vadapalli, V R K , Ekolu, S
- Date: 2019
- Subjects: Coal fly ash , Gold mine , Geotechnical characterisation
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/406547 , uj:34185 , Citation: Gcasanba, S.P. et al. 2019 : Comparative study of two biggest mineral wastes in South Africa for mine reclamation: A geotechnical study.
- Description: Abstract : Laboratory investigations were conducted on two mineral wastes to assess their geotechnical properties for mine backfilling. Composite Coal Fly Ash (CFA) sludge recovered from CFA and acid mine drainage (AMD) reaction (ratios 1:2 and 1:3) and gold mine tailings (GMT) with 3 % cement were evaluated at varying curing ages. Both samples showed favourable characteristics for use in mine reclamation. However, solid/liquid ratios should be maintained to ensure maximum strength. The results show that CFA can be recommended for mine reclamation due to it geotechnical properties. The use of GMT is possible, however blending with higher percentages of cement should be considered.
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