The Effect of Fe^<3+> Ions on the Anionic Structure of Iron-bearing Sodium Silicate Melts

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著者

    • SASAKI Yasushi
    • Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
    • MOHRI Michiya
    • Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
    • SUYAMA Kentaro
    • Formerly at Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
    • ISHII Kuniyoshi
    • Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University

抄録

The effects of the coordination of iron ions on the anionic structure of molten iron bearing sodium silicate slags at 1 273 K have been investigated by Raman spectroscopy. The Raman spectra of Na<sub>2</sub>O–SiO<sub>2</sub>–FeO–Fe<sub>2</sub>O<sub>3</sub> system equilibrated with various oxygen pressures (pO<sub>2</sub>) have been measured. The effect of the concentration of iron oxide on the Raman spectra of these systems has also been studied.<br>Under low pO<sub>2</sub>conditions (CO<sub>2</sub>/CO < 10), the Raman spectra of Na<sub>2</sub>O·2SiO<sub>2</sub>–FeO–Fe<sub>2</sub>O<sub>3</sub> are essentially the same as that of Na<sub>2</sub>O· 2SiO<sub>2</sub>. However, under high pO<sub>2</sub> conditions (CO<sub>2</sub>/CO > 54), a new Raman band of around 900 cm<sup>-1</sup> 1appears and its intensity increases with increase of pO<sub>2</sub> and iron oxide content. The scattering intensity at low frequency region ( < 550 cm<sup>-1</sup>) also becomes intense with increase of the iron oxide content.<br>It is confirmed that the near 900 cm<sup>-1</sup> band can be attributable to the network structure involving Fe<sup>3+</sup> ions. Fe<sup>3+</sup> ions in the metasilicate melts is found to conjugate the chain units and produce the sheet and monomer units. In the disilicate melts, it will conjugate the sheet units and produce the chain and three-dimensional network units.

収録刊行物

  • ISIJ international

    ISIJ international 40(12), 1181-1187, 2000-12-15

    The Iron and Steel Institute of Japan

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