Scanning electron microscopy and energy-dispersive X-ray spectroscopy of low-sulfur coal fly ash

Bruno Valentim, James C. Hower, Alexandra Guedes, Deolinda Flores

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Fly ash is a heterogeneous material produced during the burning of pulverized coal in thermoelectric power stations, and its phase and mineral composition includes (i) an inorganic constituent, amorphous and crystalline; (ii) an organic constituent composed of char materials (slightly changed, semicoked and coked particles) and organic minerals; and (iii) fluid constituent. Hence the characterization of fly ash is usually made using several methods. However, scanning electron microscopy (SEM) is the best method and is, along with X-ray diffraction, one of the most widely used techniques for the identification and characterization of phases in fly ash, especially with an SEM equipped with an energy-dispersive X-ray spectrometer (EDS). In this study SEM/EDS was carried out to analyze two high-volatility low-sulfur coals and the fly ash resulting from the combustion of a 50:50 ratio blend of these coals.

Original languageEnglish
Pages (from-to)147-166
Number of pages20
JournalInternational Journal of Energy for a Clean Environment
Volume10
Issue number1-4
DOIs
StatePublished - 2009

Keywords

  • Cenosphere
  • Char
  • Dermasphere
  • Ferrosphere
  • Plerosphere
  • Scanning electron microscopy

ASJC Scopus subject areas

  • Automotive Engineering
  • Energy Engineering and Power Technology
  • Pollution

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