Regular Article

Effect of melt structure property on Al₂O₃ activity in CaO-SiO₂-Al₂O₃-MgO system for blast furnace slag with different Al₂O₃ content

School of Metallurgy, Northeastern University, Shenyang, Liaoning 110819, P.R. China

^* e-mail: shenfm@mail.neu.edu.cn

Received: 4 February 2021
Accepted: 9 September 2021

Abstract

With the shortage of high-quality iron ore resources, more and more attention has been paid to the blast furnace (BF) smelting of Al₂O₃-rich iron ore in recent years. Thus, investigation on the thermodynamics property of Al₂O₃-rich blast furnace slag was inevitable in order to produce high quality hot metal with low cost. In this paper, based on the determination of Al₂O₃ activity by reference slag method at 1873 K in previous study, the effect of the mechanism of slag structure property on Al₂O₃ activity in CaO-SiO₂-MgO-Al₂O₃ system was discussed by Raman spectra analysis. It was found that the [AlO₄] structure was polymerized and [SiO₄] structure was depolymerized with the Al₂O₃ content increasing from 10 wt.% to 18 wt.%, which caused the Al₂O₃ activity increased.