Phase equilibria in the system "FeO"-CaO-SiO2-Al2O3-MgO with CaO/SiO2 1.3

Jang, Kyoung-oh, Ma, Xiaodong, Zhu, Jinming, Xu, Haifa, Wang, Geoff and Zhao, Baojun (2016) Phase equilibria in the system "FeO"-CaO-SiO2-Al2O3-MgO with CaO/SiO2 1.3. ISIJ International, 56 6: 967-976. doi:10.2355/isijinternational.ISIJINT-2016-099


Author Jang, Kyoung-oh
Ma, Xiaodong
Zhu, Jinming
Xu, Haifa
Wang, Geoff
Zhao, Baojun
Title Phase equilibria in the system "FeO"-CaO-SiO2-Al2O3-MgO with CaO/SiO2 1.3
Formatted title
Phase equilibria in the system "FeO"-CaO-SiO2-Al2O3-MgO with CaO/SiO2 1.3
Journal name ISIJ International   Check publisher's open access policy
ISSN 0915-1559
1347-5460
Publication date 2016-06-16
Year available 2016
Sub-type Article (original research)
DOI 10.2355/isijinternational.ISIJINT-2016-099
Open Access Status Not Open Access
Volume 56
Issue 6
Start page 967
End page 976
Total pages 10
Place of publication Chuo-ku, Tokyo, Japan
Publisher Nippon Tekko Kyokai / Iron and Steel Institute of Japan
Collection year 2017
Language eng
Formatted abstract
A series of "FeO"-containing slags are present in iron blast furnace. Phase equilibria play an important role in optimum operation of blast furnace which involves complex chemical reactions. Phase equilibria studies have been carried out in the system "FeO"-CaO-SiO2-Al2O3-MgO in equilibrium with metallic iron. The technique used includes high temperature equilibration followed by quenching and electron probe X-ray microanalysis. Pseudo-ternary sections of the phase diagrams are presented in the form of (CaO+SiO2)-Al2O3-MgO at fixed CaO/SiO2 ratio of 1.3 and "FeO" concentrations of 5 and 10 wt%. This is the first systematic study in the system "FeO"-CaO-SiO2-Al2O3-MgO important to the blast furnace operations. It was found that melilite, Ca2SiO4, merwinite, spinel and (Mg,Fe2+)O are the primary phase fields in the composition range investigated. Liquidus temperatures increase in the melilite and spinel primary phase fields and decrease in the merwinite and Ca2SiO4 primary phase fields with increasing Al2O3 concentration. The liquidus temperature is not sensitive with Al2O3 in the spinel primary phase field. Effects of MgO and "FeO" on liquidus temperature are also discussed. Extensive solid solutions can be formed in this system that have significant influence on the liquidus temperatures and the data will be used for optimisation of the thermodynamic models.
Keyword Phase equilibrium
Liquidus temperature
"FeO"-CaO-SiO2-Al2O3-MgO system
Blast furnace slag
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

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