Effect of perovskite phase precipitation on viscosity of Ti-bearing blast furnace slag under the dynamic oxidation condition

Effects of Basicity and MgO in Slag on the Behaviors of Smelting Vanadium Titanomagnetite in the Direct Reduction-Electric Furnace Process

“…Again, based on thermodynamic analysis (Equations (4) and (6)) of titanium oxide reduction, the thermodynamic tendency of the reduction from MgTi2O5 to TiC occurs more readily than that of CaTiO3, so as MgO content increased beyond 12.75%, the Ti grade in the iron increased. Previous research has also indicated that Ti-bearing blast furnace slag viscosity increases as the perovskite phase increases [23], so reduction in titanium slag viscosity facilitates the reduced diffusion of Fe and V. The same …”

“…Again, based on thermodynamic analysis (Equations (4) and (6)) of titanium oxide reduction, the thermodynamic tendency of the reduction from MgTi2O5 to TiC occurs more readily than that of CaTiO3, so as MgO content increased beyond 12.75%, the Ti grade in the iron increased. Previous research has also indicated that Ti-bearing blast furnace slag viscosity increases as the perovskite phase increases [23], so reduction in titanium slag viscosity facilitates the reduced diffusion of Fe and V. The same The XRD pattern shown in Figure 13 demonstrates that main phase compositions were CaTiO 3 (4) and (6)) of titanium oxide reduction, the thermodynamic tendency of the reduction from MgTi 2 O 5 to TiC occurs more readily than that of CaTiO 3 , so as MgO content increased beyond 12.75%, the Ti grade in the iron increased. Previous research has also indicated that Ti-bearing blast furnace slag viscosity increases as the perovskite phase increases [23], so reduction in titanium slag viscosity facilitates the reduced diffusion of Fe and V. The same thermodynamic analysis mentioned above also suggests that decrease in CaTiO 3 and increase in MgTi 2 O 5 increase the thermodynamic trend of titanium reducing to iron and increase the Ti grade in iron (Figure 12b).…”

Co-modification and Crystalline-control of Ti-bearing Blast Furnace Slags

“…1) Conventionally, blast furnace (BF) process is used to treat these ores, through which the valuable elements (Fe, V et al) are extracted, while titanium element is left into the slags, resulting in Ti-bearing blast furnace (Ti-BF) slags. These Ti-BF slags, with the TiO 2 content of 22-25 wt.%, 2) are typical residues generated and important secondary resources for titanium extraction. However, most of these slags are not treated reasonably and disposed in the slag yard, which causes a number of problems including resource waste, water contamination, air pollution and landscape transformation.…”

“…5) In order to reduce the environmental pollution and extract the titanium element, selective crystallization and phase separation (SCPS) method has been proposed and extensively studied in the past years. 1,2,[5][6][7][8][9] The whole process of SCPS method can be divided into several steps. Firstly, the Ti-BF slags are modified by additives, such as CaO, SiO 2 or P 2 O 5 , which are likely to enhance the precipitation of the Ti-enriched phases.…”

“…Firstly, the Ti-BF slags are modified by additives, such as CaO, SiO 2 or P 2 O 5 , which are likely to enhance the precipitation of the Ti-enriched phases. Secondly, the cooling processes of the Ti-BF slags are reasonably controlled in advance to fully enrich titanium element into selected crystalline phases, such as perovskite, 1,2,6,8) rutile 5,7,8) or anosovite. 9) Then the Ti-enriched phases are separated from the glassy slags using gravity separation or flotation separation method.…”