Phase equilibria of the CaO–SiO2–TiO2–Al2O3–MgO system in air at 1250–1400 °C

Experimental Study on the Phase Relations of the SiO2-MgO-TiO2 System in Air at 1500°C

“…76,77 The detailed experimental procedures used were described in our previous studies. [32][33][34]44,64 The quenched samples were dried at room temperature, and part of the sample was mounted in epoxy resin, then ground and polished using a metallographic polishing cloth with diamond sprays. The polished sample surfaces were carboncoated using a LEICA EM SCD50 sputtering device (Leica Mikrosysteme, Austria).…”

“…Based on their composition, industrial titaniabearing slags 1,21,28 conform to the Al 2 O 3 -CaO-SiO 2 -MgO-TiO 2 -Ti 2 O 3 system. 29 The phase relations of the Al 2 O 3 -CaO-SiO 2 -MgO-TiO 2 system have been intensively investigated under varying conditions 27,[29][30][31][32][33][34][35][36][37][38][39][40][41][42] by using different thermodynamic modeling tools and experimental methods. These studies provide guidance for the selective crystallization of rutile (TiO 2 ), perovskite (CaOAETiO 2 ), and pseudobrookite (MgTi 2 O 5 -Al 2 TiO 5 ) phases.…”

Phase equilibria of MgO–Al2O3–TiO2 system at 1600°C in air: Emphasis on pseudobrookite and spinel solid solution phases

“…21,22 The key of SCPS process is to select a suitable titania enrichment phase, and the titania-containing phases of perovskite (CaO⋅TiO 2 ), [23][24][25][26] rutile (TiO 2 ), 27 pseudobrookite (solid solution formed by end-members of MgO⋅2TiO 2 , Al 2 O 3 ⋅TiO 2 , FeO⋅2TiO 2 , and Ti 2 O 3 ) 28 are therefore received most of the attention as the titania enrichment phase. For perovskite, the similar dendrite structure and density with other mineral lead to the low TiO 2 enrichment rate (≤40 wt.%), 29 and the associate with spinel phase also lead to the poor dissociation. 30 The choice of rutile as the titania-rich phase requires a quite complex compositional adjustment to ensure the modified composition of titania-bearing slag located in the primary phase field of rutile.…”

“…The phase relations of the CaO–SiO 2 –MgO–Al 2 O 3 –TiO 2 system 32,33 and its subsystems have been intensively investigated under different conditions by theoretical calculation and experimental determination. The titania‐containing systems, including Al 2 O 3 –TiO 2 , 34 MgO–TiO 2 , 35 SiO 2 –MgO–TiO 2 , 36 CaO–MgO–TiO 2 , 37 CaO–Al 2 O 3 –TiO 2 , 38 CaO–SiO 2 –TiO 2 , 39 SiO 2 –Al 2 O 3 –TiO 2 , 40 CaO–SiO 2 –10–15 wt.% Al 2 O 3 –TiO 2 , 41,42 CaO–SiO 2 –5–10 wt.% MgO–10–20 wt.% Al 2 O 3 –TiO 2 , 29,31,43 have been well studied in the titania‐bearing slag composition range. However, most of the studies were focusing on the primary phase fields of perovskite or rutile.…”

The effect of 15 wt%Al2O3 addition on the equilibrium phase relations of CaO–SiO2–TiO2 system at 1400 °C in air

“…Correspondingly, Wang et al [35,36] designed compositions higher than 40 wt.% Al2O3 to explore the optimized composition range for anosovite primary phase in the systems of CaO-SiO2-TiO2-10wt.% Al2O3 and CaO-SiO2-TiO2-10wt.% Al2O3-5 wt.% MgO in air. Shi et al [37][38][39][40][41][42][43][44][45] determined the extent of the primary field of the perovskite phase for CaO-SiO2-TiO2-Al2O3-MgO systems with lower than 30 wt.% TiO2 at fixed (10 wt.% -30 wt.%) Al2O3 and (0 wt.% -15 wt.%) MgO. Moreover, commercial thermodynamic databases in MTDATA [46] , FactSage [47] , and HSC [48] have been built based on different models.…”