A study of the sulfide capacities of iron-oxide containing slags
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ULFUR removal in iron-making and steel-making processes is now of even more importance than in the past because of the increasing demand for extremely clean steels. In order to understand the desulfurization phenomena and process control, it is important that the sulfide capacities of slags are well known. To achieve this, a number of sulfide capacity measurements have been carried out earlier.[1–5] As it was felt that a set of systematic and mutually consistent sulfide capacity values could enable an effective modeling of this parameter as a function of temperature and composition, a series of sulfide capacity measurements of binary and ternary slags containing Al2O3, CaO, MgO, MnO, and SiO2 were conducted in the present laboratory.[3–9] The results have been incorporated in a slag model developed in this department.[10,11] This model enabled successful prediction of the sulfide capacities of slags containing the preceding five components from lower order systems. However, in most steel-making practices, “FeO” is an important component in the slags, and an understanding of the effect of “FeO” on the sulfide capacity of slags is essential to master the desulfurization processes. On the other hand, only a few studies have been carried out to determine the sulfide capacities of “FeO” containing slags, especially for higherorder systems. Because the data available in the literature on the sulfide capacities of “FeO”-containing slags are limited, in order to meet the technological demand, a systematic study on the sulfide capacities of “FeO”-containing slags is currently being carried out in the present laboratory. As a first step, a number of binary systems, “FeO”-SiO2, “FeO”CaO, and “FeO”-MnO, have been investigated.[12] Following this, the present work aims at the determination of sulfide capacities in the ternary systems, “FeO”-Al2O3-SiO2, “FeO”CaO-SiO2, “FeO”-MgO-SiO2, and “FeO”-MnO-SiO2. These results, together with the earlier ones, would enable predic-
M. M. NZOTTA, formerly Graduate Student, Department of Metallurgy, Royal Institute of Technology, is Process Engineer, Uddeholm Tooling AB, SE-683 85 Hagfors, Sweden. DU SICHEN, Associate Professor, and S. SEETHARAMAN, Professor and Head, are with the Department of Metallurgy, Royal Institute of Technology, SE-100 44 Stockholm, Sweden. Manuscript submitted January 12, 1999. METALLURGICAL AND MATERIALS TRANSACTIONS B
tions of the sulfide capacities of the six-component “FeO”Al2O3-CaO-MgO-MnO-SiO2 melts. Experimental measurements on some selected “FeO”-Al2O3-CaO-MgO-MnOSiO2 slags are also carried out as a part of the work to examine the reliability of the model predictions. II. PREVIOUS WORK A number of experimental studies[13,14,15] have been carried out to determine the sulfide capacities of “FeO”-containing ternary slags. Shim and Ban-ya[13] investigated the sulfur distribution between liquid iron and the ternary slags of “FeO”-MgO-SiO2 saturated with MgO over a temperature range of 1823 K to 1923 K by using magnesia crucibles. From their experimental results, t
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