The Effect of Carbon in Slag on Steel Reoxidation and Carbon Analysis by X-Ray Photoelectron Spectroscopy in the CaO-SiO^sub 2^-Al^sub 2^O^sub 3^-MgO-MnO-Fe^sub t^O System

An equilibrium experiment was carried out at 1873 K to investigate the effect of carbon in CaO-SiO^sub 2^Al^sub 2^O^sub 3^-MgO-MnO-Fe^sub t^O slag systems on their Fe^sub t^O and MnO activity coefficients, representing the slag's thermodynamic potential for steel reoxidation. The activity coeff...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2004-12, Vol.35 (6), p.1087
Main Authors: Min-Oh, Suk, Sung-Koo, Jo, Kim, Seon-Hyo, Jeong-Sik, Kim, Shim, Sang-Chul
Format: Article
Language:English
Subjects:
Carbon
Equilibrium
Metallurgy
Oxidation
Slag
Spectrum analysis
X-rays
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Summary:An equilibrium experiment was carried out at 1873 K to investigate the effect of carbon in CaO-SiO^sub 2^Al^sub 2^O^sub 3^-MgO-MnO-Fe^sub t^O slag systems on their Fe^sub t^O and MnO activity coefficients, representing the slag's thermodynamic potential for steel reoxidation. The activity coefficients of Fe^sub t^O and MnO showed not only a sharp increment but also a simultaneous slow decrement with increasing carbon content in slag, suggesting opposite roles of the carbon in slag according to its stable forms. X-ray photoelectron spectroscopy (XPS) was introduced to determine the stable forms of carbon in slag. The XPS results proved that carbon dissolves in slag as carbonate, and carbide ions under oxidizing and reducing atmospheres, respectively. The simultaneous consideration of the activity coefficients of Fe^sub t^O and MnO and stable carbon forms showed that carbonate ions increase the activity coefficients of Fe^sub t^O and MnO, but that carbide decreases them. This article suggests an application method of the present results to actual ladle refining processes, in order to enhance steel cleanliness with maintaining (Fe^sub t^O + MnO) in slag to some allowable amount. [PUBLICATION ABSTRACT]
ISSN:1073-5615
1543-1916