Electron microscopy and phase analysis of fly ash from pressurized fluidized bed combustion

Hiroki Maenami, Norifumi Isu, Emile H. Ishida, Takeshi Mitsuda

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


The characterization of the typical fly ashes from pressurized fluidized bed combustion system (PFBC) in Japan and Europe was carried out by electron microscopy and phase analysis using energy-dispersive X-ray spectroscopy (EDX). The purity of limestone as in-bed sulfur removal sorbent influences the desulfurization reaction. The high-purity limestone yielded both hydroxyl ellestadite and anhydrite in Japanese PFBC ashes, while dolomite-rich limestone yielded anhydrite in European PFBC ashes. When the high-purity limestone was used, hydroxyl ellestadite particles were observed as the independent particles or the rim around limestone particles. The Al2O3 content in the glassy phase was inversely proportional to the CaO content in the glassy phase, suggesting that the glassy phases were formed from metakaoline and calcite as end members. Since hydroxyl ellestadite, glassy phase and metakaoline are reactive under hydrothermal conditions, PFBC ashes are expected to be used as raw materials for autoclaved products.

Original languageEnglish
Pages (from-to)781-788
Number of pages8
JournalCement and Concrete Research
Issue number5
Publication statusPublished - 2004 May


  • Backscattered electron imaging
  • Characterization
  • EDX
  • Fly ash
  • SEM

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)


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