1998 Volume 38 Issue 11 Pages 1185-1193
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.