Synopsis : The Distribution of Oxygen between Liquid Iron and FetO-SiO2- CaO-MgO Slags Saturated with MgO Jae-Dong SHIM and Shiro BAN-YA The equilibri

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Synopsis : The Distribution of Oxygen between Liquid Iron and FetO-SiO2- CaO-MgO Slags Saturated with MgO Jae-Dong SHIM and Shiro BAN-YA The equilibria of oxygen distribution between liquid iron and the FetO-MgO, FetO-SiO2 MgO and FetO-SiO2 CaO MgO slags saturated with MgO have been measured in the temperature range from 1 550 to 1 650 Ž. The results obtained are as follows : 1) The oxygen content of metal in equilibrium with FetO-MgO slags saturated with MgO is expressed by the following equation. ( 5 ) 2) The iron oxide activity in FetO-SiO2-MgO and FetO-SiO2 CaO-MgO slags was determined at a temperature of 1600 Ž, and the maximum value of the iron oxide activity was found along a line joining the orthosilicate composition with FetO apex. The substitution of CaO with MgO in the slag increases the iron oxide activity. 3) In view of ionic theory, the approximate validity of regular solution model for cations were examined to formulate the thermodynamic properties of complex slag containing MgO. It was confirmed that the regular solution model was applicable to the wide range of slag composition over basic to acidic slag. The values of the interaction energy concerning MgO are as follows : (cal) (Received Oct. 16, 1980) (Korea Institute of Science and Technology, Seoul, Korea) (Faculty of Engineering, Tohoku University, Aza-Aoba Aramai Sendai 980) 89

1746 90

Fig. 1. Solubility of oxygen in liquid iron in equilibrium with FeO-MgO slag saturated with MgO. Fig. 3. Relation between oxygen distribution and FeOt content in FeO-SiO2-MgO slag in equilibrium with liquid iron. Fig. 2. Effect of temperature on the distribution of oxygen between liquid iron and FeO-MgO slag saturated with MgO. 91

Fig. 4. Iso-activity lines of FetO in FeO-SiO2-MgO slags at 1 600 Ž. Fig. 5. Oxygen distribution between liquid iron and FeO-SiO2-CaO-MgO slags saturated with MgO at 1 600 Ž. 92

Fig. 6. Iso-activity lines of FeOt in FeO-SiO2-CaO-MgO slags at 1 600 Ž. Fig. 7. Comparison of FeOt activity between FeO-SiO2-MgO and FeO-SiO2-CaO-MgO slags at 1 600 Ž. 93

Fig. 8. Application of regular solution model to the Fe3+/Fe2+ equilibrium in FeO-SiO2-MgO slags. 94

Fig. 9. Comparison of calculated results by the least square method with those of experimental data in FetO-Si02-M0-slags. 95

1752 Fig. 10. Application of regular solution model to the oxidation of liquid iron in equilibrium with FetO-Si02-Ca0-Mg0 slags. Table 1. Interaction energy between cations, (a1). Fig. 11. Distribution of oxygen between slag and metal at 1 600 Ž. 96

Fig. 12. Relationship between measured and calculated oxygen contents in liquid iron. Fig. 13. The ratio of Fe3+/Fe2+ measured and calculated by the regular solution model. 97

Table 2. Standard free energy of the reactions 1) K. L. FETTERS and J. CHIPMAN : Trans. AIME, 145 (1941), p. 95 2) C. R. TAYLOR and J. CHIPMAN : Trans. AIME, 154 (1943), p. 228 3) E. T. TURKDOGAN and J. PEARSON : JISI, 173 (1953), p. 217 4) P. HERASYMENKO and G. E. SPEIGHT: JISI, 166 (1950), p. 169 5) H. FLOOD, T. FORLAND, and K. GROJOTHEIM : JISI, 171 (1952), p. 64 6) G. W. Too and C. S. SAMIS: Trans. Met. Soc. AIME, 224 (1962), p. 878 7) C. R. MASSON : JISI, 210 (1972), p. 89 8) J. LUMSDEN : Physical Chemistry of Process Metallurgy, Part 1, (1961), p. 165 [Interscience Publishers N. Y.] 9) J. LUMSDEN : Thermodynamics of Molten Salt Mixture, (1966) [Academic Press London] 13) H. LARSON and J. CHIPMAN: Trans. Met. Soc. AIME, 197 (1953), p. 1089 14) E. T. TURKDOGAN and P. H. BILLS: JISI, 186 (1957), p. 329 ; 187 (1958), p. 143 16) H. SCHENCK and W. PFAFF: Arch. Eisenhuttenw., 32 (1961), p. 741 17) W. A. FISCHER and H. ENDE: Arch. Eisenhuttenw., 23 (1952), p. 21 18) H. L. BISCHOP, N. J. GRANT, and J. CHIPMAN: Trans. Met. Soc. AIME, 212 (1958), p. 185 21) W. A. FISCHER and H. SPITZER: Arch. Eisenhuttenw., 29 (1958), p. 611 22) M. TEMKIN: Acta Physicochimica, USSR, 20 (1945), p. 411 23) C. J. B. FINCHAM and F. D. RICHARDSON: Proc. Roy. Soc., 203 (1954), p. 40 24) M. L. KAPOOR and M. G. FROHBERG : Arch. Eisenhuttenw., 41 (1970), p. 1035 25) T. YOKOGAWA and K. NIWA: Trans. JIM, 10 (1969), p. 3, p. 81 27) T. B. WINKLER and J. CHIPMAN : Trans. AIME, 145 (1941), p. 95 28) E. GORL, F. OETERS, and R. SCHEEL : Arch. Eisenhuttenw., 37 (1966), p. 441 29) Nat. Bur. Std. (US), Tech. Note No. 270-1, (1960) 30) K. K. KELLEY : U. S. Bur. Mines, Bull. No. 584, (1960) 31) J. F. ELLIOTT and M. GLEISER : Thermochemistry for Steelmaking, 1 (1960) [Addison Weseley Pub. Co. Ltd.,] 98

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