Dissolution Kinetics of SiO2 in FeO–SiO2–V2O3–CaO–MnO–Cr2O3–TiO2 System with Different FeO Contents

Dissolution behavior of silica in molten CaO–SiO2–Fe2O3–MgO–MnO slag

“…34 The present result is consistent with the previous work. [31][32][33][34] This can be attributed to the missing of intermediate compounds on the join of the SiO 2 -slag at the temperature interval between 1773 and 1873 K. 46 Furthermore, the phase relations between slag and SiO 2 were determined by FactSage simulation, as shown in Figure 9. The starting point is the phase composition of initial slags at the equilibrium state and the ending point is pure silica.…”

“…Figure 7 shows that the silica rod directly dissolved in the molten CaO–SiO 2 –Fe 2 O 3 –MgO–MnO slag without any intermediate phases at the boundary layer. The dissolution of silica in various slag has been mostly in the direct solution manner, for example, the CaO–Al 2 O 3 –SiO 2 , 31 CaO–Fe 2 O 3 –SiO 2 ternary slag system, 32 CaO–SiO 2 –MgO–Al 2 O 3 quaternary slag system, 33 and FeO–SiO 2 –V 2 O 3 –CaO–MnO–Cr 2 O 3 –TiO 2 multiple slag system 34 . The present result is consistent with the previous work 31–34 .…”

“…Fewer works were conducted on the dissolution kinetics mechanism of SiO 2 . [29][30][31][32][33][34] Cooper et al 29,30 studied the dissolution of fused silica in 20 wt.% Al 2 O 3 -40 wt.% CaO-40 wt.% SiO 2 slag and revealed that the dissolution rate was controlled by the transport in the molten silicate. Feichtinger et al 31 in situ observed the dissolution of amorphous SiO 2 particles in the CaO-Al 2 O 3 -SiO 2 slag.…”

“…Many investigations were carried out on the dissolution mechanism of Al 2 O 3 15–23 and MgO 23–28 by using a traditional rotating cylinder/disc technique or a new high‐temperature confocal scanning laser microscopy (HT‐CSLM) technique. Fewer works were conducted on the dissolution kinetics mechanism of SiO 2 29–34 . Cooper et al 29,30 .…”

Dissolution Kinetics of Synthetic FeCr₂O₄ in CaO–MgO–Al₂O₃–SiO₂ Slag

“…It is necessary to add low melting point compounds to turn these insoluble gangue components into molten slag, so as to better reduce chromium. Some researchers [9][10][11][12][13][14][15][16][17][18][19] have found that the addition of SiO 2 can promote the formation of low melting point compounds and slag, and promote the reduction of chromium. Dawson et al 20) found that at high temperatures, alkali metal fluorides form a eutectic mixture and act as a solvent for spinel components.…”