MgO 飽和 Fe_tO-SiO_2-CaO-MgO 系スラグと溶鉄間の硫黄の平衡

概要

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A study has been made of the distribution equilibria between liquid iron and the slags of Fe_tO-MgO, Fe_tO-SiO_2-MgO and Fe_tO-SiO_2-CaO-MgO systems saturated with MgO in the temperature range of 1550° to 1650℃ by using magnesia crucible to clarify the influence of magnesia in the slags. The distribution ratio, S-O ratio and the sulphide capacity of these slags were determined as the function of the slag composition. The order of the desulphurization power of the basic oxides was CaO<FeO<MgO, and SiO_2 remarkably decreased the distribution ratio of sulphur. The results obtained are summarized as follows : 1. Fe_tO-MgO_<(sat)> binary slags log{(%S)[α_0]/[α_s]}=-4560/T+2.22 2. Fe_tO-SiO_2-MgO and Fe_tO-SiO_2-CaO-MgO slags log(N_<S^2>-[α_0]/N_<O^2>-[α_s])=-1.47N'_<Ca^<2+>>-1.92N'_<Fe^<2+>>-3.15N'<Mg^<2+>> log(N_<S^2>-P^<1/2>_<O^2>/N_<O^2>-P^<1/2>_<S_2>)=-2.35N'_<Ca^<2+>>-2.79N'_<Fe^<2+>>-4.03N'_<Mg^<2+>> logC'_s=log{N_<S^2>-(P_<O_2>/P_<S_2>)^<1/2>}=-2.35N'_<Ca^<2+>>-2.79N'_<Fe^<2+>>-4.03N'_<Mg^<2+>>+log(1-N_<SiO^<4->_4>) log(N_<S^2>/[α_s])=-936/T+1.375+logC'_s-log[α_0] where N_i and N'_M are ionic fraction and electrically equivalent fraction in the slags respectively, and C'_s is the sulphide capacity of slags expressed with mole fraction.
社団法人日本鉄鋼協会の論文
1982-02-01