Petrographic examination of coal-combustion fly ash

James C. Hower

Research output: Contribution to journalArticlepeer-review

89 Scopus citations


Fly ash is composed of inorganic and organic constituents, either neoformed in the boiler or flue gas from melting minerals of the charring or thermoplastic transitions in coal, primarily vitrinite, or inherited from the coal or auxiliary fuel. Chemical analyses alone are not sufficient to fully describe the complexity of fly ash. For example, the forms of carbons and their relationship to the inorganic fly ash constituents; the burnout of coal and non-coal carbons; and the efficiency of combustion, can all be described by petrographic studies of fly ash.

Original languageEnglish
Pages (from-to)90-97
Number of pages8
JournalInternational Journal of Coal Geology
StatePublished - Mar 1 2012


  • Arsenic
  • Fly ash carbon
  • Fly ash classification
  • Incomplete combustion
  • Mercury
  • Pulverized coal combustion

ASJC Scopus subject areas

  • Fuel Technology
  • Geology
  • Economic Geology
  • Stratigraphy


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