Optical basicity and the thermodynamic properties of slags
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Fig. 5--Comparison of the y~(H~SO4) values calculated by the modified McKay-Perring method and those determined by emf measurements.
that in cases where emf measurement or direct application of the McKay-Perring method is not possible, the mean activity coefficients of solutes can be calculated by using the modified McKay-Perring method. REFERENCES 1. H.A.C. McKay and J.K. Perring: Trans. Faraday Soc., 1953, vol. 49, pp. 163-65. 2. H. Majlma and Y. Awakura: Metall. Trans. B, 1986, vol. 17B, pp. 621-27. 3. H. Majima and Y. Awakura: Metall. Trans. B, 1988, vol. 19B, pp. 347-54. 4. A.N. Kirgintsev and A.V. Lukyanov: Russ. J. Phys. Chem., 1966, vol. 40, pp. 953-56.
Optical Basicity and the Thermodynamic Properties of Slags D.R. G A S K E L L Mori Iu has shown that the activity coefficient of P/Os in six slag systems at 1600 ~ can be correlated with the optical basicities of the slags as log YP2o~= 9.40 - 38.09A
[1]
As Suito et al.r-] have measured the distribution of P between liquid iron and MgO-saturated slags containing CaO, FeO, and SiOz at 1550 ~ 1600 ~ and 1650 ~ it is of interest to determine if an influence of temperature on Mori's correlation can be determined. The data of Suito et a l . , shown as the open circles in Figures l(a) through (c), give the correlations log YP~o~= 8.99 - 37.28A at 1550 ~
[2]
log Ye~o5= 8.80 - 36.77A at 1600 ~
[3]
log YP2o5 = 8.41 - 35.63A at 1650 ~
[4]
and
D.R. GASKELL is Professor of Metallurgical Engineering, Purdue University, West Lafayette, IN 47907. Manuscript submitted June 10, 1988. METALLURGICAL TRANSACTIONS B
Also shown in Figure 1(a) are the activity coefficients of P205, calculated from the measurements made by Suito et al. ,[31 of the distribution of P between liquid iron and MgO-saturated CaO-FeO-SiO2 slags containing, separately, NazO and BaO at 1550 ~ Similarly, Figure l(b) contains data calculated from the measurements of Kunisada and Iwai 14! for the distribution of P between liquid iron and Na20-SiOz-FeO-MgO slags at 1600 ~ In Figure l(a), the data for the slags containing BaO are in excellent agreement with the line for CaObased slags, but in both Figures l(a) and (b), the data for the slags containing NazO lie distinctly below the corresponding lines for the CaO-based slags. In the treatment of the data shown in Figures l(a) through (c), the optical basicities of the pure oxide components, listed in Table I, are those obtained by Duffy and Ingram [Sj from correlation with the electronegatives of elements. As is seen, both BaO and Na20 have theoretical optical basicities of 1.15. The lower activity coefficients of P205 in the NazOcontaining slags than in the CaO-containing slags of the same theoretical optical basicity indicate that the extent of the acid-base reaction involving P205 is greater in the former slags than is predicted by the theoretical optical basicity of Na20. In view of this, an examinat
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