Original Article

Prediction of component activities in the ternary molten slags containing titanium oxide by pseudo-multicomponent approach of MIVM

¹ Faculty of Metallurgy and Mining, Kunming Metallurgy College, Kunming 650033, China
² Kunming Key Laboratory of Comprehensive Utilization Resources of Rare and Precious Metals, Kunming 650033, China
³ National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology, Kunming 650093, China

^* e-mail: zhangjinlianga@126.com

Received: 27 April 2023
Accepted: 15 February 2024

Abstract

Based on the molecular interaction volume model (MIVM) and the coexistence theory model (CTM), the component activities were predicted in the ternary slags FeO-MnO-SiO₂, FeO-MnO-TiO₂, MnO-SiO₂-TiO₂ and FeO-SiO₂-TiO₂. In com parison with the experiment data, the total average relative errors of the predicted value by pseudo-multicomponent approach of MIVM were 16%, the total average standard deviations were 0.062. On the other hand, the total average relative errors of the predicted value by coexistence theory model were 28%, the total average standard deviations were 0.077. The predicted effect of the pseudo-multicomponent approach of MIVM has better stability and reliability than coexistence theory. Therefore, the activities of component TiO₂ were predicted in the ternary slags FeO-MnO-TiO₂, MnO-SiO₂-TiO₂ and FeO-SiO₂-TiO₂ by MIVM, the corresponding isoactivity curves were plotted and the thermodynamic behavior tendency of constituent TiO₂ in different slag systems was analyzed. This work has enriched the thermodynamic data of titanium-containing slag system and made up for the deficiency of high temperature experiment to some extent.