I am calculating ratio of FeO: Fe2O3 in Basic Oxygen Steelmaking slag CaO-SiO2-FeO-Fe2O3-MgO-Al2O3 based on the reaction 2FeO + 1/2O2 = Fe2O3, and equilibrium constant of this reaction.
I got the value of equilibrium constant and PO2, as well as the composition of the slag. I need the value of activity coefficient of FeO and Fe2O3 to get the ratio of FeO:Fe2O3.
Thank you!
these papers might help
1. Basu, S, Lahiri, AK & Seetharaman, S 2008, ‘Activity of iron oxide in steelmaking slag’, Metallurgical and Materials Transactions B, vol. 39, no. 3, pp. 447-56.
1. Basu, S, Lahiri, AK & Seetharaman, S 2010, ‘Activity of ferric oxide in steelmaking slag’, Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, vol. 41, no. 2, pp. 414-9.
You can use Regular solution model to the calculate the activity of both oxide ( both ferric and ferrous) in steelmaking slag systems.
Ban-Ya, Shiro. "Mathematical expression of slag-metal reactions in steelmaking process by quadratic formalism based on the regular solution model." ISIJ international 33.1 (1993): 2-11.
If you are only interested in calculating the %Fe2O3/%FeO ratio, you can use equations established by Darken and Gurry. Refer the following paper for the detail thermodynamic calculation
Guo, Diançai. "A new model predicting phosphorus equilibrium and its applications." steel research international 55.5 (1984): 183-188.
You can use " Sub-Regular solution method for activity calculation (please refer the following paper along with Regulation solution method))
XIAOBING ZHANG, HANS ROELOFS, STEPHAN LEMGEN, ULI URLAU, S.V.SUBRAMANIAN: steel research int. 75 (2004) No. 5, pp. 314-316.
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