The Least Number of Chemical Reactions to Describe the Oxidation and the Carburization of Liquid Iron in Irreversible Processes

Kinetics of reactions between CO–CO2 mixtures and liquid iron were investigated at 1843 K using the cold crucible technique and the concentration changes of C and O were analyzed using non-linear kinetic equations based upon independent reactions in the system. The carbon or oxygen concentration cha...

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Bibliographic Details
Published in:ISIJ International 1998/11/15, Vol.38(11), pp.1185-1193
Main Authors: Tao, Xiaojie, Fukuyama, H., Susa, M., Nagata, K.
Format: Article
Language:English
Subjects:
Applied sciences
carburization
Exact sciences and technology
independent reaction
kinetics
liquid iron
Metallurgical fundamentals
Metals. Metallurgy
non-linear kinetic equation
Production of metals
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Summary:Kinetics of reactions between CO–CO2 mixtures and liquid iron were investigated at 1843 K using the cold crucible technique and the concentration changes of C and O were analyzed using non-linear kinetic equations based upon independent reactions in the system. The carbon or oxygen concentration changed against the chemical potential gradient in the initial stage of the reactions. It was proved that such concentration changes were controlled only by interfacial reactions. The concentration changes in the whole process were successfully reproduced by nonlinear equations based upon the two independent reactions in which the nonlinear reaction CO(g)=C+O was included. It has been shown that there are always some combinations of independent reactions which can describe the chemical changes in irreversible processes from the macroscopic point of view.
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.38.1185