Thermodynamic Analysis on Reaction Abilities of Structural Units in Fe–Al Binary Melts Based on the

Xue-min Yang, Jin-yan Li, Fang-jia Yan, Dong-ping Duan

Accurately, a thermodynamic model for calculating the mass action concentrations Ni of structural units in Fe–Al binary melts describing activity or reaction ability of Al is a vital task in aluminum refining process as well as in steelmaking processes as Al is one of common deoxidizing agents. Beside activity aR, Al relative to pure liquid matter Al as standard state, the defined mass action concentrations Ni of structural units by the atom and molecule coexistence theory, i.e., AMCT, are also widely applied to describe reaction abilities. In this study melts based on the AMCT have been developed and verified through comparing with the reported activities of both Al and Fe in Fe–Al binary melts over a temperature from 1573 K to 1873 K from literature. The results indicate that the calculated mass action concentration NAl of Al or NFe of Fe can be applied to accurately describe the measured activity aR, Al of Al or aR, Fe of Fe in Fe–Al binary melts.

Thermodynamic Analysis on Reaction Abilities of Structural Units in Fe–Al Binary Melts Based on the Atom and Molecule Coexistence Theorys