Sulfide Capacity and Activity of Iron Oxide in CaO–SiO2–FeO Ternary System at 1573 K

The knowledge of sulfide capacities of FeO-containing slags is necessary for better understanding the resulfurization reaction in hot metal pre-treatments. In this study, copper-iron-sulfur liquid alloy was equilibrated with CaO–SiO2–FeO ternary slag to measure sulfide capacities and FeO activities...

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Bibliographic Details
Published in:ISIJ International 2023/05/15, Vol.63(5), pp.822-827
Main Authors: Awaya, Kosuke, Mitsuyama, Domu, Tamaki, Kazushi, Saito, Keijiro, Kashiwaya, Yoshiaki, Hasegawa, Masakatsu
Format: Article
Language:English
Subjects:
activity
iron oxide
resulfurization
sulfide capacity
sulfur distribution ratio
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Summary:The knowledge of sulfide capacities of FeO-containing slags is necessary for better understanding the resulfurization reaction in hot metal pre-treatments. In this study, copper-iron-sulfur liquid alloy was equilibrated with CaO–SiO2–FeO ternary slag to measure sulfide capacities and FeO activities simultaneously at temperature below the melting point of pure iron. The experimental result that the sulfide capacity increased with increasing FeO content could be explained by the fact that FeO was a basic oxide, and the sulfide capacity of the CaO–SiO2–FeO ternary system was significantly larger than those of the CaO–SiO2–MgO, CaO–SiO2–AlO1.5 and CaO–SiO2–CaF2 ternary systems. Although the FeO activity and oxygen potential were raised by the FeO addition, the calculated value for sulfur distribution ratio between CaO–SiO2–FeO slag and hot metal increased with an increase in FeO content.
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.ISIJINT-2022-560