Expression of oxidation ability for metallurgical slags based on the ion and molecule coexistence theory

The defined oxidation ability of metallurgical slag based on the ion and molecule coexistence theory (IMCT), i.e., the comprehensive mass action concentration of iron oxides N_FetO, was verified by comparing the calculated N_FetO and the reported activity of iron oxides αFetO in selected 14 slag systems. To calculate N_FetO in the selected slag systems, a thermodynamic model for calculating the mass action concentrations of structural units in CaO-SiO₂-MgO-FeO-Fe₂O₃-MnO-Al₂O₃-P₂O₅ type slag systems, i.e., the IMCT-N_i thermodynamic model was developed. N_FetO in the other 13 slag systems can be obtained by simplifing this IMCT-N_i. It is shown that the defined comprehensive mass action concentration of iron oxides N_FetO is more accurate than the measured activity of iron oxides a_FetO in characterizing the oxidation ability of the selected Fe_tO-containing slag systems.