Thermodynamic Optimization of the Ca-Fe-O System

A Phase Equilibrium of the Iron-rich Corner of the CaO–FeO–Fe₂O₃–SiO₂ System in Air and the Determination of the SFC Primary Phase Field

“…All the phases are irregular in shape but have good contact and interconnect with each other, which suggests that the samples are well-equilibrated. This was confirmed with multiple EPMA measurements undertaken mined by present study; dashed lines are phase boundaries estimated based on present study, CaO-"Fe2O3" pseudo-binary data 29) and CaO-"Fe2O3"-SiO2. 19) Fig.…”

“…The direct measurement of melt compositions, however, indicated that the eutectic temperature and the peritectic temperatures for CF and CF 2 phases are higher by 5-10°C than reported by Phillips and Muan. 22) The liquidus compositions predicted by FactSage thermodynamic calculation software with FToxid database [25][26][27][28] for the C 2 F, CF, H and CF 2 primary phase fields are at consistently higher Fe 2 O 3 concentrations than all measured experimental data, [22][23][24] whereas the newer optimisation by Hidayat et al 29) gave lower temperatures of liquidus and invariant reactions. Comparisons of the reported phase and invariant equilibria in the CaO-"Fe 2 O 3 " system in air are given in Fig.…”

“…The CaO-"Fe2O3" pseudo-binary system in air. 22,24,28,29) by Hamilton et al 5) reported the SFC solid solution phase to be stable between 1 067°C to 1 192°C. More comprehensive phase equilibria studies 1) of the CaO-"Fe 2 O 3 "-SiO 2 system in air were undertaken for the iron-rich corner of the phase diagram between 1 240 and 1 300°C.…”

Effect of Gas Atmosphere on the Phase Chemistry in the CaO–FeO–Fe₂O₃–SiO₂ System Related to Iron Ore Sinter-making

“…Using the data provided in Table 2, and the phase equilibria in the CaO-"Fe 2 O 3 " system predicted using the FactSage model, [13][14][15][16][17] the liquidus for the CaO-"Fe 2 O 3 "-SiO 2 system at 1 atm CO 2 has been constructed and is shown in Fig. 3, including comparison to the liquidus in air.…”

Experimental Study and Thermodynamic Re-optimization of the FeO-Fe2O3-SiO2 System

“…The present thermodynamic optimization has been carried out as part of the wider research program aimed at the complete characterization of phase equilibria and thermodynamic properties and the development of a thermodynamic database for the entire Al-Ca-Cu-Fe-Mg-Si-O-S multi-component system. [54,[62][63][64][65][66] The present optimized model parameters form part of the larger database for metallic, sulfide, oxide systems, which can be used together with the FactSage software [40] for the simulation of high temperature metallurgical processes, such as sintering, steel-making, copper smelting and converting, and for the exploration or development of new processes.…”