MgO 飽和 Fe_tO-SiO_2-CaO-MgO 系スラグと溶鉄間の酸素の分配

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The equilibria of oxygen distribution between liquid iron and the Fe_tO-MgO, Fe_tO-SiO_2-MgO and Fe_tO-SiO_2-CaO-MgO slags saturated with MgO have been measured in the temperature range from 1550°to 1650℃. The results obtained are as follows : 1) The oxygen content of metal in equilibrium with Fe_tO-MgO slags saturated with MgO is expressed by the following equation. log[wt%O]=-5520/T+2.276……(5) 2) The iron oxide activity in Fe_tO-SiO_2-MgO and Fe_tO-SiO_2-CaO-MgO slags was determined at a temperature of 1600℃, and the maximum value of the iron oxide activity was found along a line joining the orthosilicate composition with Fe_tO apex. The substitution of CaO with MgO in the slag increases the iron oxide activity. 3) In view of ionic theory, the approximate validity of regular solution model for cations were examined to formulate the thermodynamic properties of complex slag containing MgO. It was confirmed that the regular solution model was applicable to the wide range of slag composition over basic to acidic slag. The values of the interaction energy concerning MgO are as follows : α(Fe^<2+>∿Mg^<2+>)=+3070 α(Fe^<3+>∿Mg^<2+>)=-5620 α(Si^<4+>∿Mg^<2+>)=-30500 α(Ca^<2+>∿Mg^<2+>)=+4500 (cal)
社団法人日本鉄鋼協会の論文
1981-08-01