Phase Equilibria in the System “FeO”-CaO-SiO2-Al2O3-MgO at Different CaO/SiO2 Ratios

Jang, Kyoung-oh; Ma, Xiaodong; Zhu, Jingxian; Xu, Hongxiang; Wang, Geoff; Zhao, Baojun

doi:10.1007/s11663-017-0955-3

Cited by 12 publications

(4 citation statements)

References 19 publications

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“…It should be noted that the C2S compound formed in cement clinker or liquid slag accepts to some extent various types of doping elements, including Fe 2 + and Fe 3 + , which affect the stable C2S polymorph. [30][31][32][33][34][35][36] Additionally, once the solubility limit is achieved, a ternary intermediate compound with the C2S-related composition (e.g., CaFeSiO 4 , kirschsteinite) coexists with the liquid slag. 37) These features indicate that the phase relationship between the liquid slag and the C2S precipitates cannot be simply predicted from the C2S-C3P system.…”

Section: Phase Identification Of Crystal Precipitated From Molten Cao-sio 2 -Feo X -P 2 O 5 Slag By High Temperature In-situ X-ray Difframentioning

confidence: 99%

Phase Identification of Crystal Precipitated from Molten CaO–SiO2–FeOx–P2O5 Slag by High Temperature In-situ X-ray Diffraction

2020

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Section: Phase Identification Of Crystal Precipitated From Molten Cao-sio 2 -Feo X -P 2 O 5 Slag By High Temperature In-situ X-ray Difframentioning

confidence: 99%

Phase Identification of Crystal Precipitated from Molten CaO–SiO2–FeOx–P2O5 Slag by High Temperature In-situ X-ray Diffraction

2020

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“…The equilibrium phase relation presented by a phase diagram is of fundamental importance for the development of material and process design [1]. During the production of steel from iron ore, the processing parameters-i.e., the temperature, composition and oxygen partial pressure-are basically determined according to phase diagrams, such as the Fe t O-SiO 2 -based system for sinter production [2], the CaO-SiO 2 -based and CaO-SiO 2 -MgO-Al 2 O 3 -based systems for the design of furnace and converter smelting slag [3], the Fe-C-based systems for heat treatment [4,5], and the CaO-SiO 2 -MgO-Al 2 O 3 -TiO 2 system for the comprehensive utilization of titania-bearing slag [6,7], etc. It is now well known that the thermodynamic properties of the slag have a significant influence on the metalslag reaction, crystallization, inclusion formation, oxidation, and degasification, etc.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium Phase Relations for a SiO2-Al2O3-FeOx System at 1300 °C and 1400 °C in Air

Qiu

Shi

et al. 2022

Metals

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A long-term fundamental study for the construction of the thermodynamic database of a metallurgical slag system has been proposed. In the present work, the equilibrium phase relations for the key ternary SiO2-Al2O3-FeOx system at 1300 °C and 1400 °C in air were experimentally determined by the equilibrium-quenching technique, followed by X-ray Photoelectron Spectroscopy and Scanning Electron Microscope equipped with an Energy Dispersive X-ray Spectrometer analysis. The oxidation states of Fe2O3 and Fe3O4 were confirmed at 1300 °C and 1400 °C, respectively, from both XPS detection and FactSage calculation. Within the high-SiO2 composition range, the solid phases of silica, mullite, magnetite and ferric oxide were confirmed as the equilibrium phases. Based on the equilibrium compositions, the 1300 °C and 1400 °C isotherms were projected onto a SiO2-Al2O3-FeOx quasi-ternary phase diagram; however, obvious discrepancies with about a 20 °C difference were confirmed from further comparison with the predictions given by FactSage, indicating that more efforts are needed for the updating of the current thermodynamic database relating to metallurgical slag oxide systems.

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“…3) As we know, SFCA phase (Sillico-Ferrite of Calcium and Aluminum) and SFC (Sillico-Ferrite of Calcium, a kind of simplified SFCA with no Al 2 O 3 ) are believed to be the most desirable bonding phases in sinter because of its high reducibility, 4) high mechanical strength, 5,6) and low reduction degradation. 7) Therefore, the quality of SFCA and SFC has been widely reported, including the chemical formula, 8,9) crystal structure, 10,11) thermal stability, 12,13) mineral phase, 14) properties of liquid phase, [15][16][17] and factors affecting them. [18][19][20] Besides above properties, the reduction fundamentals are also important to improve the reducibility of iron ores.…”

Section: Introductionmentioning

confidence: 99%

Fundamentals of the Reduction of SFC in CO/CO2 Gas at 1000°C

Jiang

Wang

et al. 2020

ISIJ Int.

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SFC (Sillico-Ferrite of Calcium) is a kind of simplified SFCA (Sillico-Ferrite of Calcium and Aluminum) with no Al 2 O 3 . SFC and SFCA are believed to be the most desirable bonding phase in sinter. In order to better understand the fundamentals of the reduction of SFC, a series of experiments on the SFC reduction were carried out in the present work, including phase equilibria tested by XRD, morphology tested by SEM-EDS, and reduction pathway under the different CO/CO 2 mixture gas at 1 000°C. The experimental results indicated, (1) in the case of CO = 20% and 40%, most of Fe 2 O 3 in SFC was reduced to FeO. The equilibrium phases were FeO, CaO•Fe 2 O 3 , and CaO•SiO 2 . (2) In the case of CO = 60%, CaO•Fe 2 O 3 was reduced to generate FeO and 2CaO•Fe 2 O 3 . The equilibrium phases were FeO, 2CaO•Fe 2 O 3 , and CaO•SiO 2 . (3) In the case of CO = 80% and 90%, FeO was reduced to Fe, and 2CaO•Fe 2 O 3 was reduced to generate Fe and CaO. The equilibrium phases were Fe, CaO, and CaO•SiO 2 . The findings from this work may provide guidelines for the improvement of sintering production and blast furnace performances.

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Phase Equilibria in the System “FeO”-CaO-SiO2-Al2O3-MgO at Different CaO/SiO2 Ratios

Cited by 12 publications

References 19 publications

Phase Identification of Crystal Precipitated from Molten CaO–SiO<sub>2</sub>–FeO<sub>x</sub>–P<sub>2</sub>O<sub>5</sub> Slag by High Temperature <i>In-situ</i> X-ray Diffraction

Phase Identification of Crystal Precipitated from Molten CaO–SiO<sub>2</sub>–FeO<sub>x</sub>–P<sub>2</sub>O<sub>5</sub> Slag by High Temperature <i>In-situ</i> X-ray Diffraction

Equilibrium Phase Relations for a SiO2-Al2O3-FeOx System at 1300 °C and 1400 °C in Air

Fundamentals of the Reduction of SFC in CO/CO<sub>2</sub> Gas at 1000°C

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