Experimental investigation and thermodynamic modeling of vanadium, chromium and phosphorus distributions between FeO-SiO2-CaO-V2O3-Cr2O3-P2O5-MnO slag and semi-steel

摘要

The oxidation behavior of hot metal and the distribution ratios of V, Cr and P between FeO-SiO2-CaO-V2O3-Cr2O3-P2O5-MnO slags and semi-steel have been studied by a combination of experimental measurements and thermodynamic modeling. The results indicate that the distribution ratio of P shows an obvious increasing tendency with the increase of slag basicity. In contrast to the P distribution, the effect of basicity on distribution ratios of V and Cr are negligible. The oxidation ratios of both V and Cr are higher than 84% and the oxidation ratio of P can achieve 40-60%. A thermodynamic model for calculating the mass action concentration of structural units and distribution ratios of V, Cr and P was developed based on the ion and molecule coexistence theory (IMCT). The calculated V and P distributions show good agreement with the experimentally measured data. The reliable agreement indicates that the IMCT model can be applied to predicting the element distributions for basic vanadium slag.