Abstract
In order to meet the recent demand for low phosphorus steels, highly basic slags must be used to increase the refining efficiency. In this study, the equilibrium partition ratio of phosphorus (LP) between MgO saturated BaO-FetO-SiO2 slags and liquid iron was measured at 1600°C as a function of slag composition. The results are summarized as follows.
(1)The MgO solubility of BaO-FetO-SiO2 slags is lower than those for the CaO-FetO-SiO2 and Na2O-FetO-SiO2 systems.
(2)The maximum value of the phosphate capacity of this system is higher than that for the CaO system and not less than that of the Na2O system.
(3)There is a FeO content to give the maximum LP value at constant BaO/SiO2 ratios. This is in accord with the well known fact applicable for the CaO-FeO-SiO2 system.
(4)The activity coefficients of FeO and FeO1.5 have been measured and discussed in terms of slag composition.
