Effects of MgO and TiO2 on the viscous behaviors and phase compositions of titanium-bearing slag

• Published in: International journal of minerals, metallurgy and materials Vol. 23; no. 8; pp. 868 - 880
• Main Authors: Feng, Cong, Chu, Man-sheng, Tang, Jue, Qin, Jin, Li, Feng, Liu, Zheng-gen
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01.08.2016; Springer Nature B.V; School of Metal urgy, Northeastern University, Shenyang 110819, China
• Subjects: Activation energy; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; composition;magnesium; Corrosion and Coatings; dioxide; Fourier transforms; furnace; Glass; Infrared analysis; Infrared spectroscopy; ironmaking;blast; Magnesium oxide; Materials Science; Metallic Materials; Natural Materials; oxide;titanium; Perovskites; Phase composition; properties;phase; Slag; slag;viscous; Surfaces and Interfaces; Thin Films; Titanium; Titanium dioxide; Tribology; Viscosity; Viscous flow; X-ray diffraction; blast furnace slag; phase composition; ironmaking; viscous properties; titanium dioxide; magnesium oxide
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-016-1302-4

The effects of MgO and TiO2 on the viscosity, activation energy for viscous flow, and break-point temperature of titanium-bearing slag were studied. The correlation between viscosity and slag structure was analyzed by Fourier transform infrared（FTIR） spectroscopy. Subsequently, main phases in the slag and their content changes were investigated by X-ray diffraction and Factsage 6.4 software package. The results show that the viscosity decreases when the MgO content increases from 10.00wt% to 14.00wt%. Moreover, the break-point temperature increases, and the activation energy for viscous flow initially increases and subsequently decreases. In addition, with increasing TiO2 content from 5.00wt% to 9.00wt%, the viscosity decreases, and the break-point temperature and activation energy for viscous flow initially decrease and subsequently increase. FTIR analyses reveal that the polymerization degree of complex viscous units in titanium-bearing slag decreases with increasing MgO and TiO2 contents. The mechanism of viscosity variation was elucidated. The basic phase in experimental slags is melilite. Besides, as the MgO content increases, the amount of magnesia–alumina spinel in the slag increases. Similarly, the sum of pyroxene and perovskite phases in the slag increases with increasing TiO2 content.