Abstract
This research provides fundamental insight into the roles of MgO and Al2O3 on the viscous and structural behaviors of CaO−SiO2−MgO−Al2O3−10 mass% TiO2−5 mass% FeO (CaO/SiO2 = 1.3) system primary blast furnace slag. The slag viscosity is measured by the rotating cylinder method, which is essential to the efficient and stable operation of a blast furnace. The network structure characterization of the quenched vitreous samples was conducted using Fourier Transformation Infrared (FTIR) and Raman spectroscopy. Usual viscous behaviors (that the slag viscosity and the activation energy decrease or increase with increasing MgO or Al2O3 content) were observed, corresponding to changes in the network structure certified by FTIR and Raman analyses. It seems that the addition of MgO and Al2O3 prefers to modify the Si−O and Ti−O network in the present slag. When the slag composition reaches 10% MgO and 12% Al2O3, unexpected viscous behaviors (that MgO increases viscosity and Al2O3 decreases viscosity) are discovered. The roles of MgO and Al2O3 could be interpreted by changes in the arrangement structure of ions in liquid, corresponding to changes in the primary equilibrium phase region determined in phase diagrams and variation in the difference between the experimental and liquidus temperature, respectively.
Highlights
Iron ore containing TiO2 is widely used in many blast furnaces (BFs) to produce hot metal in China because of the country’s big reserves of titanium magnetite ore
All the results showed that Al2 O3 increased viscosity, which was attributed to the role of Al2 O3 in the polymerization of silicate melts [10,11]
The starting materials for the viscosity experiments consist of FeC2 O4 ·2H2 O, CaCO3, SiO2, MgO, Al2 O3, and TiO2 powder with analytical purity
Summary
Iron ore containing TiO2 is widely used in many blast furnaces (BFs) to produce hot metal in China because of the country’s big reserves of titanium magnetite ore. Plenty of the work focusing on the final slag may be not suitable for expounding the issues in a high temperature BF process with a Ti-bearing burden, such as the poor slag/iron separation and unstable permeability [12]. These issues are closely related to the primary slag, the experimental viscosity data are scarce because the primary slag cannot be visible and directly removed. Combined with the current development of raw iron ore materials, the CaO−SiO2 −MgO−Al2 O3 −TiO2 −FeO multi-component system slag with varying MgO and Al2 O3 content is designed to simulate Ti-bearing primary slag for viscosity measurement. This study will develop a better understanding of Ti-bearing slag from a broader perspective
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