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

¹ College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China
e-mail: diaojiang@163.com
² Department of Scientific Research, Chongqing University of Education, Chongqing 400065, P.R. China

Received: 1 January 2016
Accepted: 4 April 2016

Abstract

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.