Viscosity Prediction Model for Blast Furnace Slag with High Al<sub>2</sub>O<sub>3</sub>
Haiyan Zheng, Yaqiang Ding, Shifa Zhou, Qiu‐Lin Wen, Xin Jiang, Qiangjian Gao, Fengman Shen
Abstract
Based on the theory of fluid dynamics, an improved Urbain model (IUM) for predicting viscosity of blast furnace (BF) slag with high Al 2 O 3 slag is proposed by introducing two model parameters, R 4 (the ratio of ( X (CaO) + X (MgO))/(2 X (SiO 2 ) + 3 X (Al 2 O 3 ))) and N (the ratio of X (MgO)/(3 X (Al 2 O 3 ))). Experimental results indicate that the IUM is highly precise and more suitable for BF slag. Isoviscosity contours for CaO–SiO 2 –15%Al 2 O 3 –MgO melts at 1500 o C are plotted using the data obtained from the IUM, which show that the slag viscosity centers at the line of R w 2 (the ratio of w (CaO)/ w (SiO 2 )) = 0.92–1.36 ( w (SiO 2 ) = 35.66%–38.55%) and N w (the ratio of w (MgO)/ w (Al 2 O 3 )) = 0.05–0.76, the viscosity at the center line is 0.3 Pa s, and the viscosity increases in the process of diffusion from the center line to the periphery. Slag viscosity increases generally with increase in the value of N w ( N ), decreases slightly with increase in the value of R w 2 ( R 4 ) when N w is lower than 0.55, whereas increases with increase in the value of R w 2 ( R 4 ) when N w is greater than or equal to 0.55, indicating that the stability of the slag caused by the change in composition becomes poor when N w is high.