Effects of Basicity, MgO, and Al2O3 on Thermodynamic and Physicochemical Properties of CaO-SiO2-MgO-Al2O3 Slag System
Ladle furnace (LF) refining is one of the most widely used secondary refining processes for producing clean steel and constitutes a key process in the steelmaking-continuous casting section. The properties of slag play a decisive role in determining molten steel quality and refining efficiency. In this study, based on the composition of refining slag from a steelmaking plant in China, the properties of a CaO-SiO<sub>2</sub>-MgO-Al<sub>2</sub>O<sub>3</sub> slag system were investigated with respect to five aspects, the liquid phase region, sulphide capacity, melting properties, slag viscosity, and mineralogical phase precipitation, at varying temperatures, basicity, <i>w</i>(MgO) and <i>w</i>(Al<sub>2</sub>O<sub>3</sub>) using FactSage and the KTH model. Analysis of the slag properties indicates that the CaO-SiO<sub>2</sub>-MgO-Al<sub>2</sub>O<sub>3</sub> slag system performs better when basicity ranges from 3 to 4, <i>w</i>(MgO) is between 6% and 8%, and <i>w</i>(Al<sub>2</sub>O<sub>3</sub>) is 15%-25%. These findings provide theoretical support and guidance for optimizing the refining slag system in plant trials.
Authors
- Zicheng Xin (ORCID: https://orcid.org/0009-0002-5699-2419)
- Qing Liu (ORCID: https://orcid.org/0000-0001-8980-2250)
- Jiangshan Zhang (ORCID: https://orcid.org/0009-0007-7269-0011)
Institutions
- University of Science and Technology Beijing (CN)
Publication Details
- Journal
- Molecules
- Published
- 2025-11-03
- DOI
- https://doi.org/10.3390/molecules30214275
- Primary Topic
- Metallurgical Processes and Thermodynamics
- Type
- article
- Field-Weighted Citation Impact
- 0.00