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Vol.27, No.8, 683 ~ 691, 1989
Title
A Study on the termodynamic Properties of the Sb - Fe - Pb Ternary System
김동식Dong Sik Kim, 이용학Yong Hack Lee
Abstract
This study was undertaken to investigate the behavior of antimony in the Sb-Fe-Pb system. The phase relation and the antimony activity in the Sb-Fe-Pb system were determined at 1473K by using the isothermal equilihrium and isopiestic methods, respectively. The antimony activities in the Sb-Fe-Pb system determined from the present work and the phase relations obtained by Schuhmann method were utilized in calculation of the activities of iron and lead. The results showed that the concentration of iron has considerable effect on the antimony activity and that the activities of iran and lead exhibit positive deviations from Raoultian behavior in the low concentration range of iron and lead, respectively. The activity coefficients of elements for each of the binary Sb-Pb and Sb-Fe systems and the interaction parameters between solutes in antimony were calculated at 1473k. The activity coefficients of lead and iron in infinite dilution of antirnony at 1473k are as follows : ln γ_(pb) = ln 0.86 + 0.30 X_(pb) + 4.8X_(Fe), ln γ_(Fe) = ln 0.38 + 0.32 X_(Fe) + 4.8X_(pb) The solubility of lead in slag becomes larger with increasing the oxygen potential, and lead is much more soluble in iron silicate slags than in calcium ferrite slags.
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