Composition and Morphology Characteristics of Magnetic Fractions of Coal Fly Ash Wastes Processed in High-Temperature Exposure in Thermal Power Plants

Coal-fired power stations are one of the primary sources of power generation in the world. This will produce considerable amounts of fly ash from these power stations each year. To highlight the potential environmental hazards of these materials, this study is carried out to evaluate the characteriz...

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Bibliographic Details
Published in:Applied sciences 2019-05, Vol.9 (9), p.1964
Main Authors: Vu, Dinh-Hieu, Bui, Hoang-Bac, Kalantar, Bahareh, Bui, Xuan-Nam, Nguyen, Dinh-An, Le, Qui-Thao, Do, Ngoc-Hoan, Nguyen, Hoang
Format: Article
Language:English
Subjects:
Aluminum oxide
Carbon
chemical properties
Coal-fired power plants
Electricity
Electricity distribution
Fly ash
fly ash coal wastes
Furnaces
Geology
High temperature
Iron carbonate
Iron oxides
magnetic fraction
Magnetite
Mineralogy
Morphology
Mullite
Outdoor air quality
Particle size
Physical characteristics
Power plants
Quartz
R&D
Research & development
Silicon dioxide
Thermal power
Thermal power plants
XRD analysis
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Summary:Coal-fired power stations are one of the primary sources of power generation in the world. This will produce considerable amounts of fly ash from these power stations each year. To highlight the potential environmental hazards of these materials, this study is carried out to evaluate the characterization of fly ashes produced in thermal power plants in northern Vietnam. Fly ash was firstly fractionated according to size, and the fractions were characterized. Then, each of these fractions was analyzed with regard to their mineralogical features, morphological and physicochemical properties. The analytical results indicate a striking difference in terms of the characteristics of particles. It was found that magnetic fractions are composed of magnetite hematite and, to a lower rate, mullite, and quartz. Chemical analyses indicate that the non-magnetic components mainly consist of quartz and mullite as their primary mineral phases. As the main conclusion of this research, it is found that the magnetic and non-magnetic components differ in terms of shape, carbon content and mineralogical composition. In addition, it was found that magnetic components can be characterized as more spheroidal components compared to non-magnetic ones. This comprehensive characterization not only offers a certain guideline regarding the uses of different ash fractions but it will also provide valuable information on this common combustion process.
ISSN:2076-3417
2076-3417
DOI:10.3390/app9091964