Petrographic characterization of economizer fly ash

B. Valentim, J. C. Hower, S. Soares, A. Guedes, C. Garcia, D. Flores, Á Oliveira

Research output: Contribution to journalArticlepeer-review


Policies for reducing NOx emissions have led power plants to restrict O2, resulting in high-carbon fly ash production. Therefore, some potentially useful fly ash, such as the economizer fly ash, is discarded without a thorough knowledge of its composition. In order to characterize this type of fly ash, samples were collected from the economizer of a Portuguese power plant burning two low-sulfur bituminous coals. Characterization was also performed on economizer fly ash subsamples after wet sieving, density and magnetic separation. Analysis included atomic absorption spectroscopy, loss-on-ignition, scanning electron microscopy/energy-dispersive X-ray spectroscopy, optical microscopy, and micro-Raman spectroscopy.

Original languageEnglish
Pages (from-to)208-216
Number of pages9
JournalMinerals and Metallurgical Processing
Issue number4
StatePublished - Nov 2009


  • Economizer fly ash
  • Fly ash
  • Petrography
  • Petrology

ASJC Scopus subject areas

  • Control and Systems Engineering
  • General Chemistry
  • Geotechnical Engineering and Engineering Geology
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


Dive into the research topics of 'Petrographic characterization of economizer fly ash'. Together they form a unique fingerprint.

Cite this