Correlation between fluidity properties and local structures of three typical Asian coal ashes

Xiongchao Lin, Keiko Ideta, Jin Miyawaki, Hiromichi Takebe, Seong Ho Yoon, Isao Mochida

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Correlations among compositions, microstructures, and fluidity properties of three typical Asian coal ashes and their rapidly quenched slags were systematically investigated using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and multinuclear solid-state nuclear magnetic resonance (SS-NMR). The viscosities were measured from 1700 °C to their solidification temperatures. Different fluidity properties were found because of the presence of the various microstructures. The Datong ash and slag, with the highest viscosity in this study, mainly consisted of Q 4 and Q 3 structures of Si with a high degree of polymerization. The Malinau ash and slag with high iron contents had a Si structure similar to that of the Datong ash; the Q 4 and Q 3 structures indicated that the divalent Fe ions may principally bond as a framework modifier with Al tetrahedrons rather than Si tetrahedrons. In addition, alkaline-earth ions in the Adaro ash and slag segmented the framework to form primary Q 3 and Q 2 structures, resulting in the lowest viscosity.

Original languageEnglish
Pages (from-to)2136-2144
Number of pages9
JournalEnergy and Fuels
Volume26
Issue number4
DOIs
Publication statusPublished - Apr 19 2012

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

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