石灰系,ソーダ系スラグ-高炭素溶鉄間のマンガンの分配
1987 年 73 巻 9 号 p. 1109-1116
詳細
1987 年 73 巻 9 号 p. 1109-1116
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-SiO2-Al2O3 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% CaF2 or CaCl2 to the CaO-SiO2-Al2O3 slags, while they decreased with increasing CaF2 content for CaF2-based slags containing a small amount of SiO2 or free of SiO2.
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](% SiO2)1/2, for CaO-SiO2-Al2O3-CaF2, CaCl2 slags could be expressed by the following equation;
log K' Mn-Si = - 0.84{( % CaO)/(% SiO2)-0.067( % CaF2), - 0.025 ( % CaCl2)} - 0.29
