Investigation on surface tension of CaF2–CaO–SiO2 (–MgO–Al2O3) melts Yigui Lao, Yunming Gao, Qiang Wang and Guangqiang Li Metall. Res. Technol., 121 5 (2024) 518 Published online: 28 October 2024 DOI: 10.1051/metal/2024066