In the present study, the viscosity of the CaO–SiO2 –FeO–Al2 O3 –MgO slag system was measured for the recovery of FeO in the electric arc furnace (EAF) process using Al dross. Considering the MgO-saturated operational condition of the EAF, the viscosity was measured in the MgO-saturated composition at 1823 K with varying FeO and Al2 O3 concentrations. An increase in the slag viscosity with decreasing temperature was observed. The activation energy was evaluated, and the change in the thermodynamically equilibrated phase was considered. The changes in the aluminate structure with varying FeO and Al2 O3 concentrations were investigated by Fourier-transform infrared spectroscopy, which revealed an increase in the [AlO4 ] tetrahedral structure with increasing Al2 O3 concentration. Depolymerization of the aluminate structure was observed at higher FeO concentrations. The Raman spectra showed the polymerization of the silicate network structure at higher Al2 O3 concentrations. By associations between the silicate and aluminate structures, a more highly polymerized slag structure was achieved in the present system by increasing the Al2 O3 concentration.
|Publication status||Published - 2021 Aug|
Bibliographical noteFunding Information:
Funding: This research was funded by Ministry of Science, ICT, and Future Planning of Korea, grant number GP2020-013.
Acknowledgments: Youngjae Kim acknowledges financial support from the Basic Research Project no. GP2020-013 of the Korea Institute of Geoscience and Mineral Resources (KIGAM), funded by the Ministry of Science, ICT, and Future Planning of Korea.
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Metals and Alloys