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The deoxidation equilibria among Mg, Al and O in liquid iron in the presence of MgO .A1 2 O 3 spinel was studied at 1 873 K by adding Al and Mg alloys into liquid iron in MgO and A1 2 O 3 crucibles. From the experimental results, the equilibrium constant, K Mg , for the reaction, MgO (s)=Mg+O, and the first- and second-order interaction parameters including cross-product terms between Mg and O have been determined. Using these thermodynamic parameters, the relations between a Mg vs. a o , a Mg vs. a Al in liquid iron could be well represented with respective oxide activities in MgO.A1 2 O 3 spinel. A stability diagram for MgO, MgO. A1 2 O 3 and A1 2 O 3 phases was constructed at 1 873 K as a function of dissolved Mg, Al and O contents in liquid iron to examine the condition for the formation of MgO.A1 2 O 3 spinel during the deoxidation process.

Deoxidation Equilibria among Mg, Al and O in Liquid Iron in the Presence of MgO Al2O3 Spinel.