Influence of B sub(2)O sub(3) and TiO sub(2) 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: 01-04-2015
• Subjects: Blast furnace slags; Blast furnaces; Breaking; Iron and steel making; Perovskites; Slags; Structural steels; Titanium dioxide; Viscosity
• ISSN: 1611-3683; 1869-344X
• DOI: 10.1002/srin.201400039

The viscous behavior of CaO-SiO sub(2)-MgO-TiO sub(2)-Al sub(2)O sub(3)-B sub(2)O sub(3) blast furnace (BF) slag system was studied. The effects of the B sub(2)O sub(3) and the TiO sub(2) 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 TiO sub(2) content tended to enhance the slag viscosity and break point temperature of the slag due to the formation of perovskite, whereas B sub(2)O sub(3) had an opposite effect on them. In addition, increasing B sub(2)O sub(3) content seems to be more effective in affecting the viscosity compared to TiO sub(2) additions. Depolymerization of the slag after adding B sub(2)O sub(3) should be attributed to decrease in the quantities of perovskite. All the viscosities are within 0.2Pas for high temperature (over 1633K 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 B sub(2)O sub(3) content reduces significantly break point temperature and descent rate of temperature rises with increasing B sub(2)O sub(3) content.