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Activity and Activity Coefficient of Iron Oxides in the Liquid FeO-Fe2O3-CaO-SiO2 Slag Systems at Intermediate Oxygen Partial Pressures

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Abstract

At present, there is a scarcity of data on the activities of iron oxides in the FeO-Fe2O3-CaO-SiO2 slag system at intermediate oxygen partial pressures and temperatures relevant to sulfide smelting and nonferrous metallurgy. The present study provides relevant data at temperatures between 1573 and 1673 K and partial pressures of oxygen between 10−9 and 10−4 atm. The experiments were carried out by equilibrating the slag in a CO-CO2 gas mixture in a platinum crucible, after which the phases of all the experimental samples, including the platinum foil, were analyzed by electron probe microanalysis (EPMA). Where only liquid phase or liquid phase and tridymite (SiO2) were observed, wet chemical analysis was used to determine the ratio of (mass pct Fe2+)/(mass pct Fe3+). Activity and activity coefficients for FeO (liquid) and FeO1.33 (solid) were calculated. Tendencies of the effect of the (CaO/SiO2) ratio, temperature, and oxygen partial pressure on these thermochemical quantities are discussed in this article.

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Authors and Affiliations

  1. Pyrosearch Centre, School of Engineering, The University of Queensland, Brisbane, QLD, 4072, Australia

    Hector M. Henao (Research Fellow)

  2. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, 980-8577, Japan

    Kimio Itagaki (Professor Emeritus)

Authors
  1. Hector M. Henao
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  2. Kimio Itagaki
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Correspondence to Hector M. Henao.

Additional information

Manuscript submitted March 7, 2006.

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Henao, H., Itagaki, K. Activity and Activity Coefficient of Iron Oxides in the Liquid FeO-Fe2O3-CaO-SiO2 Slag Systems at Intermediate Oxygen Partial Pressures. Metall Mater Trans B 38, 769–780 (2007). https://doi.org/10.1007/s11663-007-9077-7

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  • DOI: https://doi.org/10.1007/s11663-007-9077-7

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