Effect of CaO/SiO₂and Al₂O₃on Viscous Behaviors of the Titanium-Bearing Blast Furnace Slag

Abstract

In the Blast Furnace (BF) process, the viscous behaviors of molten slags are essential to the efficiency and the productivity of operations. In this work, the effects of CaO/SiO 2 and Al 2 O 3 on the viscosity, activation energy for viscous flow, and break point temperature of titanium-bearing BF slags are analyzed. To connect the viscosity and the slag structure, Fourier transform infrared spectroscopy (FTIR) is performed on the as-quenched slags. It is found that the viscosity and the activation energy for viscous flow of slags decrease as the CaO/SiO 2 content increases from 1.00 to 1.20 and increase with increasing the Al 2 O 3 content from 11.00 to 15.00 wt%. As for the break point temperature, it raises when the CaO/SiO 2 and the Al 2 O 3 content increases. FTIR results reveal that the polymerization degree of complex viscous units in the slag decreases as the CaO/SiO 2 increases. However, it is opposite when the Al 2 O 3 content increases. The variation of viscosity and activation energy for viscous flow for the different CaO/SiO 2 and Al 2 O 3 content slags are explained.

Influence of Al2O3, CaO/SiO2, and B2O3 on Viscous Behavior of High Alumina and Medium Titania Blast Furnace Slag

“…It is inferred that these slags also take on the characteristics of short slag and more Al 2 O 3 responds to larger viscosity. With an increase of the Al 2 O 3 content, viscosity varies more quickly in a narrow temperature range and the fluidity deteriorates rapidly, attributing to the precipitation of phases with the high melting point [21,22]. The break point temperature shows a similar tendency, as marked in Figure 4 9− octahedral configuration [3].…”

“…Meanwhile, the fluidity and the stability of slags become worse. Besides, with an increase of the CaO/SiO 2 , the change of viscosity is much sharper, and the viscosity becomes more sensitive to the temperature change, resulting from the precipitation of phases with the high melting point [21,22]. Figure 2 indicates that break point temperature raises with increasing C/S and shows relatively gentle change at the stage where C/S varies from 1.24 to 1.34.…”

Selective Enrichment and Separation of Ti–Fe Enriched Mineral from Ti-bearing Electric Furnace Slag with Metallic Iron as Carrier

“…The Si-Fe-bearing solid solution can be considered as a mixture of FeSiO 3 and CaSiO 3 , which makes calculation simple. In order to achieve the selective reduction of pseudobrookite, it is necessary to analyze the reduction thermodynamics of pseudobrookite and FeSiO 3 .…”

“…Vanadium titanomagnetite concentrate, containing about 52% titanium and 89% vanadium of the vanadium titanomagnetite ore, is commonly used to produce iron and extract vanadium using the conventional blast furnace process. [2][3][4] However, the titanium resource remains in the Ti-bearing blast furnace slag (22-25 wt% TiO 2 ) without effective utilization.…”

Roles of MgO and Al2O3 on the Viscous and Structural Behavior of Blast Furnace Primary Slag, Part 1: C/S = 1.3 Containing TiO2

“…The final slag is usually described by a CaO−MgO−Al 2 O 3 −SiO 2 −TiO 2 quinary system, which has been researched in many experimental studies [3][4][5][6][7][8][9] about the effects of MgO and Al 2 O 3 on slag viscosity. The effect of Al 2 O 3 content on the viscosity of quinary slag with different TiO 2 concentrations was studied by Feng et al [3], Yan et al [4], and Bian and Gao [5]. All the results showed that Al 2 O 3 increased viscosity, which was attributed to the role of Al 2 O 3 in the polymerization of silicate melts [10,11].…”