FeO-Fe203-CaO系の相平衡
フェライト系スラグの平衡論的研究 (第2報)
1981 年 97 巻 1120 号 p. 473-478
詳細
1981 年 97 巻 1120 号 p. 473-478
Slags of the system FeO-Fe2O3 -CaO were equilibrated in platinum crucibles with CO-CO2 gas mixtures at 1200 and 1300°C. The oxygen partial pressure ranged from that at iron-saturation to 0.21 atm. The results are as follows:
1) The relationships between the oxygen partial pressure and the melt composition were established and the liquidus isotherms were determined by the “Solid-Separation” method.
2) Some univariant situations in which a melt is in equilibrium with two solids were specified.
3) The equilibrium relationships between the melt composition, the oxygen partial pressure and the temperature were clarified. They were empirically fitted to a linear equatiolog po2(atm)=5.88log(Fe+++/Fe++)-0.106 wt%CaO-(32400/T)+14.82
4) Activities of FeO (1), Fe3O4 (s) and CaO (s) were calculated by application of the Gibbs-Duhem equation to this ternary system.
5) The system FeO-Fe203-CaO was compared with the system FeO-Fe203-SiO2 from metallurgical point of view.
