Activities of FeO in CaO-Al2O3-SiO2-FeO and CaO-Al2O3-CaF2-FeO Slags.

• Taniguchi Yoshinori

  Department of Metallurgy, The University of Tokyo

• Morita Kazuki

  Department of Metallurgy, The University of Tokyo

• Sano Nobuo

  Department of Metallurgy, The University of Tokyo

Abstract

Activity coefficients of FeO in molten CaO-Al₂O₃-SiO₂-FeO (<5 %) slags were determined at 1673 and 1873 K by equilibrating the slags with copper-iron alloys in a controlled oxygen partial pressure (P_O₂=5.71×10^-12 atm at 1673 K, 1.90×10^-10 atm at 1873 K). Activity coefficients of iron in copper-iron (<4 %) alloys at 1673 K were preliminarily determined by controlling the activity of iron using FeO·Cr₂O₃ saturated with Cr₂O₃ in a various oxygen partial pressures (P_O₂=3.66×10^-12-9.14×10^-11 atm). <br>It was found that the activity coefficients of FeO obey Henry's law, and have the maximum value when the ratio of N_CaO/N_SiO₂ is about 2 at a constant Al₂O₃ content. The activity coefficients of iron in copper-iron alloy referred to pure liquid were determined as<br><br>lnγ_Fe=2.76-11.3N_Fe.<br><br>The effect of a CaF₂ addition to the CaO-Al₂O₃-FeO system on the activity coefficient of FeO was also investigated at 1723 K.

Journal

• ISIJ International

  ISIJ International 37 (10), 956-961, 1997

  The Iron and Steel Institute of Japan

Keywords

• FeO
• Cu-Fe alloys
• CaO-Al₂O₃-SiO₂-FeO
• bath smelting process
• thermodynamics
• activity

Details

• CRID: 1390282681428880000
• NII Article ID: 10002457104
• NII Book ID: AA10680712
• DOI: 10.2355/isijinternational.37.956
• COI: 1:CAS:528:DyaK2sXnslyrurg%3D
• ISSN: 13475460
• ISSN: 09151559
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational1989/37/10/37_10_956/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed