（1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing,Beijing 100083, China 2. Hongxing Iron and Steel Co., Ltd., JISCO, Jiayuguan 735100, Gansu, China）
Abstract：In order to further analyze the effect of Al2O3 content on the viscosity of low alumina slags, based on the composition of the blast furnace slags of Jiusteel, the viscosity, liquidus temperature, activity and phase change in cooling crystallization process of the slags with different Al2O3 content were studied by experiments and FactSage thermodynamics software. The results indicated that the viscosity of slags increased with increasing the Al2O3 content in the experimental low aluminum slags. The viscosity was below 0.45 Pa·s above 1 450 ℃, and at the same time, the slags had good fluidity and stability. The activity of Al2O3 increased with the increase of Al2O3 content, on the contrary, the activity of SiO2 decreased, which also reflected that the degree of polymerization of the slags was improved. The cooling process of slags showed that above the liquidus temperature, the viscosity of slags was mainly related to the complexity of the slag structure, and below the liquidus temperature, the viscosity was affected by the double slags structure of liquid phase and the solid phase particle content.
2018, Vol. 28 
