Phase equilibria in the system “FeO”-CaO-SiO2-Al2O3-MgO at different CaO/SiO2 ratios

Jang, Khoung-Oh, Ma, Xiaodong, Zhu, Jinming, Xu, Haifu, Wang, Geoff and Zhao, Baojun (2017) Phase equilibria in the system “FeO”-CaO-SiO2-Al2O3-MgO at different CaO/SiO2 ratios. Metallurgical and Materials Transactions B, 1-14. doi:10.1007/s11663-017-0955-3

Author Jang, Khoung-Oh
Ma, Xiaodong
Zhu, Jinming
Xu, Haifu
Wang, Geoff
Zhao, Baojun
Title Phase equilibria in the system “FeO”-CaO-SiO2-Al2O3-MgO at different CaO/SiO2 ratios
Formatted title
Phase equilibria in the system “FeO”-CaO-SiO2-Al2O3-MgO at different CaO/SiO2 ratios
Journal name Metallurgical and Materials Transactions B   Check publisher's open access policy
ISSN 1073-5615
Publication date 2017-03-09
Sub-type Article (original research)
DOI 10.1007/s11663-017-0955-3
Open Access Status Not yet assessed
Start page 1
End page 14
Total pages 14
Place of publication New York, NY, United States
Publisher Springer New York LLC
Collection year 2018
Language eng
Formatted abstract
The “FeO”-containing slags play an important role in the operation of an ironmaking blast furnace (BF), in particular the primary slags such as the system “FeO”-CaO-SiO2-Al2O3-2 mass pct MgO with CaO/SiO2 weight ratios of 1.3, 1.5, and 1.8 saturated with metallic iron. To investigate the characteristics of such a slag system and its behavior in BF, the phase equilibria and liquidus temperatures in the slag system have been experimentally determined using the high-temperature equilibration and quenching technique followed by an electron probe X-ray microanalysis (EPMA). Isotherms between 1553 K and 1603 K (1280 °C and 1330 °C) were determined in the primary phase fields of dicalcium silicate, melilite, spinel, and monoxide [(Mg,Fe2+)O]. Pseudo-ternary phase diagrams of (CaO + SiO2)-Al2O3-“FeO” with a fixed MgO concentration at 2 mass pct and at CaO/SiO2 ratios of 1.3, 1.5, and 1.8 have been discussed, respectively, simplifying the complexity of the slag system for easy understanding and applying in BF operation. It was found that the liquidus temperatures increase in melilite and spinel primary phase fields, but decrease in dicalcium silicate and monoxide primary phase fields with increasing Al2O3/(CaO + SiO2) ratio. In addition, the liquidus temperatures decrease with increasing “FeO” concentration in dicalcium silicate and melilite primary phase fields, while showing an increasing trend in the spinel and monoxide primary phase fields. The data resulted from this study can be used to improve and optimize currently available database of thermodynamic models used in FactSage.
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Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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