The Effect of Titanium Carbonitride on the Viscosity of High-Titanium-Type Blast Furnace Slag

• Main Authors: Hongen Xie, Wenzhou Yu, Zhixiong You, Xuewei Lv, Chenguang Bai
• Format: Article
• Language: English
• Published: MDPI AG 2019-03-01
• Series: Metals
• Subjects: blast furnace slag; TiO₂; titanium carbonitride; viscosity
• Online Access: https://www.mdpi.com/2075-4701/9/4/395

In this paper, the effect of titanium carbonitride (Ti(C,N)) on the viscosity of high-titanium-type blast furnace slags was investigated. The different Ti(C,N) contents were achieved by adjusting the reduction degree of TiO₂ to reflect the real characteristics of the high-titanium slag. The results show that the viscosity of the slag increased with the increasing Ti(C,N) content and decreased with the rising temperature. A deviation between the measured and the fitted viscosity appeared as the content of the Ti(C,N) was beyond 4 wt%. Furthermore, the apparent viscous flow activation energy of the slag ranged from 106.13 kJ/mol to 235.46 kJ/mol by varying the Ti(C,N) contents from 0 wt% to 4.97 wt%, which was evidently different from the results of previous studies. The optical microscope and energy dispersive X-ray spectroscopy (EDS) analysis show that numerous bubble cavities were embedded in the slags and the Ti(C,N) particles agglomerated in the solidified samples. This phenomenon further indicates that the high-titanium slag is a polyphase dispersion system, which consists of liquid slag, solid Ti(C,N) particles and bubbles.