Abstract
Two techniques are described for the enhancement of the kinetics of reduction of iron oxide from slags by carbon in molten iron. Laboratory experiments have shown that the rate of iron oxide reduction by carbon-saturated iron can be increased by 5 to 10 times when the reaction is carried out under a reduced-pressure atmosphere. This effect is thought to be the result of the increased volumetric gas evolution through the slag layer and the associated increase in slag stirring. A model is presented, which relates the mass-transfer coefficient for ferrous ions in the slag to its stirring that is controlled by varying the ambient pressure. Additional laboratory experiments examined the electrochemical nature of iron oxide reduction from slag by carbon in liquid iron. Results indicate that the reduction of iron oxide from slag is increased in the presence of an applied electric field. The external circuit allows for the separation of the half-cell reactions associated with iron oxide reduction and decarburization and increases the reaction area available for the individual reactions. These results have significant implications for several important slag metal reactions, which occur during ironmaking and steelmaking operations.
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An erratum to this article is available at http://dx.doi.org/10.1007/s11663-009-9326-z.
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Pal, U.B., MacDonald, S.A., Woolley, D.W. et al. Results demonstrating techniques for enhancing electrochemical reactions involving iron oxide in slags and C in liquid iron. Metall Mater Trans B 36, 209–218 (2005). https://doi.org/10.1007/s11663-005-0022-3
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DOI: https://doi.org/10.1007/s11663-005-0022-3