石灰系, ソーダ系スラグ-高炭素溶鉄間のマンガンの分配

概要

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The manganese distribution between lime- or soda-based slags and liquid iron containing about 4%C was examined at 1350, 1400, or 1500℃. 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
社団法人日本鉄鋼協会の論文
1987-07-01