Thermodynamic Properties and Viscosities of High-Titanium Slags

Abstract

The influence of TiO 2 , binary basicity and Al 2 O 3 /TiO 2 ratio on the heat capacity, enthalpy and slag fluidity of CaO-SiO 2 -MgO-Al 2 O 3 -TiO 2 -based slag at 1 693 K, 1 723 K, and 1 753 K (1 420°C, 1 450°C, and 1 480°C) was investigated in this work. From the calculation results, it was found that the heat capacity of the slag increased with the increasing of TiO 2 content and the Al 2 O 3 /TiO 2 ratio and with the decreasing of basicity in the experimental temperature range. Enthalpy change increased with the increasing Al 2 O 3 /TiO 2 ratio and the decreasing of TiO 2 content. With the increasing of basicity, the slag temperature rises slightly and the viscosity decreases along with it. Additionally, the larger the basicity, the smaller the viscosity fluctuation under heat decrement. Therefore, a proper increase in basicity contributes to reduce viscosity fluctuation, for the current slag system, the appropriate basicity should be 1.15-1.20. Besides, the fluctuation of the temperature reaches a small value around the Al 2 O 3 /TiO 2 ratio is 0.6, and in metallurgical production, the heat input should be adjusted in time according to titanium content charge fluctuations, thus ensuring good fluidity and an adequate reaction between the slag and metal. The above experimental results can provide a reference for ironmaking enterprises using more vanadium-titanium magnetite ore. KEY WORDS: TiO 2 ; basicity; Al 2 O 3 /TiO 2 ratio; heat capacity; enthalpy change; viscosity.

Thermal Stability of Molten Slag in Blast Furnace Hearth

“…Detailed device debugging reference elsewhere. 21,22) Before the measurement, the viscometer was calibrated with castor oil. Throughout the experiment, high-purity Ar (99.999%) with a flow rate of 1 L/min was used as the protective gas.…”

Viscosity and desulphurisation behaviour of CaO–SiO 2 –MgO–Al 2 O 3 –BaO–MnO slag

“…[1,2]. Furthermore, the physicochemical properties of the slag were determined by its chemical composition except temperature, mainly related to type and proportion of the iron ore and other raw materials [3,4]. In China, the chemical composition of blast furnace slag differed greatly owing to the utilization of special ores.…”

Thermodynamic Analysis of the Reduction of Vanadium-titanium Magnetite by Gasification Gas

“…The key to using VTM is to effectively separate and extract the valuable metals, such as iron, vanadium, and titanium 5) . Currently, the blast furnace process is the primary technology for utilizing VTM [6][7] . Because a solvent is introduced in this process, not only the grade of titanium in the blast furnace slag is very low, but TiO 2 reacts with the solvent (CaO) to form perovskite, which makes it difficult to extract the titanium resources from VTM.…”