Vermicular kaolinite relics in fly ash derived from Bokaro and Jharia coals (Jharkhand, India)

During a study of fly ash from two pulverized fuel power plants (Bokaro and Chandrapura) burning coal from the Bokaro Coalfield in Jharkand state, India, glassy and vermicular mineral forms were found associated with the char. A combination of optical microscopy, XRD, SEM/EDS, and XRF analysis has s...

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Bibliographic Details
Published inInternational journal of coal geology Vol. 162; pp. 151 - 157
Main Authors Valentim, Bruno, Flores, Deolinda, Guedes, Alexandra, Shreya, Neha, Paul, Biswajit, Ward, Colin R.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.05.2016
Subjects
Bokaro coalfield
Chambers
Coal
Coal minerals
Combustion
Electric power plants
Expanded clays
Fly ash
Furnaces
Glassy spheres
India
Kaolinite
X-ray diffraction
Coal minerals
Expanded clays
Bokaro coalfield
Glassy spheres
India
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Summary:During a study of fly ash from two pulverized fuel power plants (Bokaro and Chandrapura) burning coal from the Bokaro Coalfield in Jharkand state, India, glassy and vermicular mineral forms were found associated with the char. A combination of optical microscopy, XRD, SEM/EDS, and XRF analysis has shown that this morphotype, reported here for the first time, originated from kaolinite that expanded during heating inside the furnace chamber under relatively low combustion temperatures. The morphotype has an internal structure that resembles the fanning-out structure formed during vermicular kaolinite development. •A combination of analytical techniques has shown vermicular kaolinite in coal from the Bokaro Coalfield in India.•The vermicular forms in fly ash have an internal relic of the fanning-out structure of the vermicular kaolinite.
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ISSN:0166-5162
1872-7840
DOI:10.1016/j.coal.2016.06.011