Phase equilibria in synthetic coal-petcoke slags (Al2O 3-CaO-FeO-SiO2-V2O3) under simulated gasification conditions

Jinichiro Nakano, Kyei Sing Kwong, James Bennett, Thomas Lam, Laura Fernandez, Piyamanee Komolwit, Seetharaman Sridhar

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38 Scopus citations


Phase equilibria of the Al2O3-CaO-FeO-SiO 2-V2O3 system in synthetic slag mixtures simulating coal-petcoke slag chemistry at 1500 °C in an oxygen partial pressure of 10-8 atm were investigated by a series of quench experiments. Quenched samples were analyzed by inductively coupled plasma optical emission spectrometry (ICP), X-ray diffractometry (XRD), transmission electron microscopy (TEM), and wavelength dispersive X-ray (WDX). Two precipitated crystal phases were identified in molten slags: mullite (3Al 2O3·2SiO2) in Al2O 3-rich slags and karelianite (V2O3) in V 2O3-rich slags. Scanning electron microscopy and TEM diffraction patterns confirmed the presence of the mullite and karelianite phases. On the basis of experimental results, an isothermal phase diagram of the Al2O3-CaO-FeO-SiO2-V2O3 system at 1500 °C and PO2 = 10-8 atm is proposed while keeping CaO = 7.0 wt % and FeO = 13.5 wt %.

Original languageEnglish (US)
Pages (from-to)3298-3306
Number of pages9
JournalEnergy and Fuels
Issue number7
StatePublished - Jul 21 2011
Externally publishedYes

ASJC Scopus subject areas

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


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