Influence of B2O3 and TiO2 on Viscosity of Titanium-Bearing Blast Furnace Slag

• Published in: Steel research international Vol. 86; no. 4; pp. 386 - 390
• Main Authors: Gao, Yanhong, Bian, Lingtao, Liang, Zhongyu
• Format: Journal Article
• Language: English
• Published: Weinheim Blackwell Publishing Ltd 01.04.2015; Wiley Subscription Services, Inc
• Subjects: B2O3; BF slag containing TiO2; break point temperature; Perovskite; Slag; Viscosity
• ISSN: 1611-3683; 1869-344X
• DOI: 10.1002/srin.201400039

The viscous behavior of CaO–SiO2–MgO–TiO2–Al2O3–B2O3 blast furnace (BF) slag system was studied. The effects of the B2O3 and the TiO2 on the viscosity and break point temperature, as well as the correlations of the properties with the slag structure were analyzed. According to the experiment results, an increase in the TiO2 content tended to enhance the slag viscosity and break point temperature of the slag due to the formation of perovskite, whereas B2O3 had an opposite effect on them. In addition, increasing B2O3 content seems to be more effective in affecting the viscosity compared to TiO2 additions. Depolymerization of the slag after adding B2O3 should be attributed to decrease in the quantities of perovskite. All the viscosities are within 0.2 Pa s for high temperature (over 1633 K in this experiment), which is less than that of the B‐free slag. However, the value increases sharply when temperature is below break point temperature. In addition, an increase in the value of B2O3 content reduces significantly break point temperature and descent rate of temperature rises with increasing B2O3 content.