Development of a Kinetic Model for Ti‐Bearing Steel‐Slag Reaction

Abstract

A kinetic model based on the double-film theory is developed to predict the composition-change behavior of Ti-bearing steel and slag during the slag-liquid steel reaction process and validated by experimental results. The chemical reactions between the slag-metal, slag-crucible refractory, and metal-crucible refractory are considered. Specifically, a coupled reaction model based on the CaO-MgO-CaF 2 -SiO 2 -Al 2 O 3 -TiO 2 -FeO-MnO and Fe-Si-Al-Ti-Ca-Mg-Mn-S-O systems is applied to describe the reaction between liquid steel and slag. Furthermore, the activity coefficients of slag components are calculated using the ion and molecular coexistence theory model. The reaction between the slag and refractory is described using an empirical equation. The reaction between the liquid steel and refractory is described using a coupled reaction model, wherein the reaction between [Al] and MgO is considered. Finally, the effect of (TiO 2 ) on the [Ti] is discussed using this model. The results indicate that the [Ti] decreases, the [Si] increases, and the [Al] increases initially and subsequently decreases with reaction time. An increase in (TiO 2 ) can decrease the oxidation of [Ti] by (SiO 2 ) and (Al 2 O 3 ). When the (TiO 2 ) increases, the mass ratio of CaO to SiO 2 should be further increased to decrease the oxidation of [Ti].