1977 Volume 63 Issue 12 Pages 1809-1818
As a first step in a study of the physical chemistry of dephosphorization in steelmaking process, equilibrium measurements were made of hydrogen-steam mixtures of simple FetO-P2O5 slags in equilibrium with solid iron in the temperature range form 1200 to 1450°C. Activities of FetO and P2O5 in the slags were determined from the data Activity of FetO negatively deviated from Raoult's law and its of P2O5 showed positive daviation from Henry's law. The ferrous and ferric concentrations of slags, expressed as Fe+3/Fe+2, were decreased by the addition of P2O5.
The iso-activity lines in FeO-Fe2O3-P2O5 slags at 1600°C were calculated by applying the regular solu- tion model of Lumsden to the experimental data.