Abstract
The slag/metal sulphur equilibrium data at 1550°C using lime/alumina slaps containing MgO and small amounts of FeO have been used to assess the free energy of formation of hercynite. Thus, for the reaction: 0.053Fe(l)+Fe0.947O(l)+Al2O3(s) =FeO•Al2O3(s) the standard free energy change at 1550°C has been calculated as -7644cal. This value is compared with the experimental data available in the literature.
