The manganese distribution between lime-or soda-based slags and liquid iron containing about 4%C was examined at 1350, 1400, or 1500°C. The effect of calcium halides on the distribution ratio of manganese was examined for lime-based slags.
The distribution ratios of manganese for CaO-SiO
2-Al
2O
3 slag were nearly the same order of magnitude as those for soda-based slags. The distribution ratios increased by the addition of less than 14% CaF
2 or CaCl
2 to the CaO-SiO
2-Al
2O
3 slags, while they decreased with increasing CaF
2 content for CaF
2-based slags containing a small amount of SiO
2 or free of SiO
2.
As a result of the comparison of the oxygen activities in equilibrium with Mn, Si and C in the iron, the equilibrium for the reactions in which carbon participated, e.g. (MnO) + C = Mn + CO(g), was considered not to be established in the reaction time given here when the slag of high silica was used. However, the quasi-equilibrium was estimated to be attained for the displacement reaction between Mn and Si. Then, the apparent equilibrium constant,
K'Mn-Si= (% MnO)[% Si]
1/2/[% Mn](% SiO
2)
1/2, for CaO-SiO
2-Al
2O
3-CaF
2, CaCl
2 slags could be expressed by the following equation;
log
K' Mn-Si = - 0.84{( % CaO)/(% SiO
2)-0.067( % CaF
2), - 0.025 ( % CaCl
2)} - 0.29
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