Structural analysis and evaluation of surface tension of silicate melts containing CaO and FexO

• Published in: Chemical engineering science 2021-12, Vol.245, Article 116870
• Main Authors: Zhang, Rui, Wang, Zhen, Meng, Yifan, Jiao, Shiyan, Jia, Jixiang, Min, Yi, Liu, Chengjun
• Format: Article
• Language: English
• Subjects: Estimation model; Silicate melt; Structure; Surface tension
• ISSN: 0009-2509; 1873-4405
• DOI: 10.1016/j.ces.2021.116870

[Display omitted] •Formation mechanism of surface tension is elaborated through structural difference.•Structural role of component and mole of oxygen bond are obtained via Raman spectra.•A novel structure-based surface tension model is applied to molten silicate system. The surface tension of silicate melts is a key property in liquid steel refining. Accurate estimation of surface tension can provide guidance for the design of slag composition and the control of the smelting process. In this study, 22 samples of the CaO–SiO2–FexO system were investigated by Raman spectroscopy to obtain the mole fraction of oxygen bonds, and structural data were interpolated to obtain the oxygen bond database within the compositional range. Based on spectral analysis, the formation mechanism of surface tension for the silicate melt was elaborated from the perspective of microstructure, and then a structure-based surface tension estimation model was developed for the present system. The root-mean-square error of the present model was 0.055 N·m−1, indicating reasonable agreement between the predicted and experimental values, and the present estimation model had higher accuracy than Tanaka's model for the CaO–SiO2–FexO system and its subsystems.