MnO-SiO_2-Al_2O_3-FeO 系スラグと溶鋼との平衡

概要

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This study is aimed to obtain the data of the activities of MnO and SiO_2 in MnO-SiO_2-Al_2O_3-FeO slags saturated with Al_2O_3, and of the equilibrium between manganese, silicon and oxygen in liquid steel at 1550℃. The results are summarized as follows : The FeO content in the slag is less than 3 mol%. Both α_<MnO> and α_<SiO_2> change linearly against the ratio of (N_<MnO>+N_<FeO>)/N_<SiO_2> in the region of the ratio from 0.5 to 1.3. The activity of SiO_2 in the slag saturated with mullite (3Al_2O_3・2SiO_2) and Al_2O_3 is 0.42, and the activity of MnO in the slag saturated with galaxite (MnO・Al_2O_3) and Al_2O_3 is 0.15 at 1550℃. The oxygen content in liquid steel in equilibrium with slags saturated with Al_2O_3 is calculated. It is in good agreement with the results of the previous experimental work of present authours. The liquidus lines of Al_2O_3, mullite and galaxite in MnO-SiO_2-Al_2O_3 system at 1550℃ are determined, and the iso-activity lines for MnO and SiO_2, which were determined thermochemically in the previous work, correct and represent in the ternary diagram.
1977-08-01