Effects of Li <sub>2</sub> O and B <sub>2</sub> O <sub>3</sub> on High‐Temperature Fluidity of CaO–Al <sub>2</sub> O <sub>3</sub> –MnO‐Based Fluorine‐Free Mold Flux
Because of the harm of fluoride to the environment, the research of fluoride‐free mold flux has been widely concerned. High temperature fluidity is an important indicator to judge whether the mold flux is qualified. B 2 O 3 and Li 2 O show excellent performance in CaO–SiO 2 ‐based fluorine‐free mold flux, and the effect of B 2 O 3 and Li 2 O on fluidity of CaO–Al 2 O 3 ‐based fluorine‐free mold flux is worth studying. In this study, effect of B 2 O 3 and Li 2 O on the microstructure, viscosity, and melting temperature of CaO–Al 2 O 3 –MnO‐based fluorine‐free mold flux is studied by Raman spectroscopy, Fourier transform infrared spectroscopy, rotating cylinder method, and differential thermal analysis. The experimental results indicate that the viscosity, activation energy for viscous flow and melting temperature of CaO–Al 2 O 3 –MnO‐based fluorine‐free mold flux all exhibit a downward trend with the increase of B 2 O 3 and Li 2 O. When content of B 2 O 3 is controlled within 4–10 wt% and Li 2 O is controlled within 2–6 wt% in slag, these slags demonstrate excellent high‐temperature fluidity: viscosity ranges between 0.185 and 0.318 Pa·s, and melting temperature falls within 1107.79 and 1093.18 °C, meeting the requirements for continuous casting.
Authors
- Y. Li
- Changgui Cheng
- Xufeng Qin
- Yin Cui
- Liang Liu
Institutions
- Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine (UA)
- Wuhan University of Science and Technology (CN)
Publication Details
- Journal
- steel research international
- Published
- 2025-12-23
- DOI
- https://doi.org/10.1002/srin.202501010
- Primary Topic
- Metallurgical Processes and Thermodynamics
- Type
- article
- Field-Weighted Citation Impact
- 0.00