<Original Papers>Study on the Oxidizing Power of Steel Making Slags. (I) : Measurement of Activity of FeO in Silica Saturated Iron Oxide Slag and Lime Saturated Iron Oxide Slag

Distributions of oxygen between molten iron and iron oxide slag saturated with SiO_2 or CaO were studied at 1,560-1,660℃ in the atmosphere of nitrogen or argon. Activities of FeO in molten slag were calculated from oxygen contents of molten iron by the Nernst\u27s distribution law. And the following conclusions were obtained : 1) In the temperature range 1,560-1,660℃, activity of FeO in SiO_2 saturated slag was almost independent of temperature, and the value of 0.38 was given. 2) Activity of FeO in CaO saturated slag, equilibrated with molten iron, decreased with rise of temperature