MgO飽和FetO-SiO2-CaO-MgO系スラグと溶鉄間の酸素の分配
1981 年 67 巻 10 号 p. 1745-1754
詳細
1981 年 67 巻 10 号 p. 1745-1754
The equilibria of oxygen distribution between liquid iron and the FetO-MgO, FetO-SiO2-MgO and FetO-SiO2-CaO-MgO slags saturated with MgO havebeen measured in the temperature range from 1 550°C to 1 650°C. The results obtained are as follows :
1) The oxygen content of metal in equilibrium with FetO-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 FetO-SiO2-MgO and FetO-SiO2-CaO-MgO slags was determined at a temperature of 1 600°C, and the maximum value of the iron oxide activity was found along a line joining the orthosilicate composition with FetO 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 (Fe2+Mg2+)=+3 070 α(Fe3+Mg2+)=-5 620
α (Si4+Mg2+)=-30 500 α(Ca2+Mg2+)=+4 500 (cal)
