Effect of TiO₂ on the Liquid Zone and Apparent Viscosity of SiO₂-CaO-8wt%MgO-14wt%Al₂O₃ System

Abstract

The effect of TiO 2 on the liquids zone and apparent viscosity of SiO 2 -CaO-8wt%MgO-14wt%Al 2 O 3 system were studied in the present work. At fixed CaO/SiO 2 between 0.5 and 1.3, higher TiO 2 content decrease the slag viscosity indicating that TiO 2 additions up to 50 wt.% behaved as a viscosity-decrease agent by loosening the silicate network structure. The free running temperature increase at TiO 2 content from 10 wt.% to 30 wt.%. At fixed TiO 2 content of 20, 30 and 40 wt.%, increasing the CaO/SiO 2 resulted in lower viscosity due to the depolymerization of the structure. Four different viscosity models were discussed and two of them were employed to predict the viscosity and found that the Urbain's Model agrees well with experimental data at high viscosity (4-12 dPa·s) and the KCC's Model agrees well with experimental data at a lower viscosity (0-4 dPa·s).

Influence of TiO2 on the Viscosity of a High Alumina Slag and on Carbon Brick Corrosion

“…The critical temperature (T cr ) was the temperature at which the slag could flow freely and the slag becomes non‐Newtonian in behavior during the cooling cycle . As shown in Figure c, T cr which is obtained by drawing a tangent line with a slope of −1 on the viscosity‐temperature curve decreases from about 1651 to 1620 K with increasing TiO 2 content from 0 to 6 wt%. A higher TiO 2 content of the slag corresponds to a lower critical temperature.…”

“…Based on the calculated results of viscosity estimation model, Zhang et al concluded that TiO 2 decreased the viscosity of CaO–SiO 2 –MgO–Al 2 O 3 –TiO 2 slags. Yan et al investigated the effect of TiO 2 from 0 to 50 wt% on the apparent viscosity of CaO–SiO 2 –8 wt%MgO–14 wt%Al 2 O 3 –TiO 2 slags with CaO/SiO 2 ratio in the range of 0.5–1.3. The results showed that TiO 2 could reduce the viscosity of slag with lower CaO/SiO 2 ratio while the viscosity of slag with CaO/SiO 2 ratio of 1.3 decreased firstly with addition of TiO 2 and then increased when TiO 2 reach up to 20–30 wt%.…”

Influences of Al2O3 and TiO2Content on Viscosity and Structure of CaO–8%MgO–Al2O3–SiO2–TiO2–5%FeO Blast Furnace Primary Slag

“…The viscosity of CaO-MgO-Al 2 O 3 -SiO 2 -TiO 2 system has been investigated by many researchers [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].There has been a consensus among the studies [11][12][13][14][15][16][17][18] that TiO 2 was a reducing viscosity agent in the quinary slag with fixed MgO, Al 2 O 3 and basicity. For the effect of binary basicity, most experts reported that viscosity decreased with increasing basicity [17][18][19][20][21][22].…”

Non-isothermal Reduction Behavior and Mechanism of Hongge Vanadium Titanomagnetite Pellet with Simulated Shaft Furnace Gases

“…Most of the iron and partly vanadium can be reduced into the hot metal. [6][7][8][9][10] However, almost all of the titanium is concentrated into the molten slag, and it is very hard to extract titanium components through traditional separation processes so far. 11) Over past decades, several new processes on the basis of direct reduction containing coal to improve the utilization of VTM, HVTM, or ilmenite have been developed.…”