Effect of melt structure property on Al2O3 activity in CaO-SiO2-Al2O3-MgO system for blast furnace slag with different Al2O3 contentXinguang Hu, Fengman Shen, Haiyan Zheng, Yongchun Guo, Xin Jiang and Qiangjian GaoMetall. Res. Technol., 118 5 (2021) 515DOI: https://doi.org/10.1051/metal/2021076