AUTHOR=Zhao Mao-Guo , Wang Xu-Feng , Chen Gu-Jun , He Sheng-Ping 

TITLE=The Establishment of Thermodynamic Model for Ti Bearing Steel-Slag Reaction and Discuss

JOURNAL=Frontiers in Materials

VOLUME=8

YEAR=2022

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2021.792714

DOI=10.3389/fmats.2021.792714

ISSN=2296-8016

ABSTRACT=<p>A thermodynamic model for seven CaO-MgO-BaO-CaF<sub>2</sub>-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> ladle slags based on the Ion and Molecule Coexistence theory (IMCT) is establishment and validated by the experiment results at 1873K. The calculated activity of SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> in the slag can be approved by the experiment results and the IMCT model used in this study is reasonable. Then the influence factors such as the mass ratio of CaO to SiO<sub>2</sub> (C/S ratio) ranging from 1 to 10, the mass ratio of CaO to Al<sub>2</sub>O<sub>3</sub> (C/A ratio) ranging from 1 to 2.5, TiO<sub>2</sub> content (wt pct) ranging from 0 to 30, BaO content (wt pct) ranging from 0 to 30 are investigated based on the thermodynamic calculating results. The raise of C/S ratio, TiO<sub>2</sub> content and BaO content in the slag can increase the molar Gibbs energy change (ΔG) of Ti reacted with SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub> or Al reacted with SiO<sub>2</sub>. The effect of C/A ratio on the molar Gibbs energy change (ΔG) of Ti reacted with SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub> or Al reacted with SiO<sub>2</sub> was less. Finally, the slag with higher C/S ratio and TiO<sub>2</sub> content and appropriate BaO content can weaken the reaction between Ti and SiO<sub>2</sub> or Al<sub>2</sub>O<sub>3</sub> in the slag.</p>