反応界面におけるCaO濃縮を考慮した緻密なウスタイトの還元速度解析

概要

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Dense wustite plates containing CaO were reduced with CO-CO_2-Ar gas mixtures at 1273K. Soon after start of the reduction, formation of metallic iron was observed and the reduction rate increased gradually with increasing in reduction time. Lattice parameter measurement of the samples reduced to predetermined state revealed that CaO concentration in the unreduced wustite increased with decreasing in the distance from the wustite/iron reaction interface. The reduction rate was examined with modified model of alloy solidification in consideration of the CaO enrichment at the reaction interface. The apparent reaction rate constant, kc, was correlated well to the CaO concentration at the reaction interface, C_T, not to the initial concentration, C_O. The kc increased remarkably with increasing in C_T up to about 2 mass% and tended to become constant where C_T become more than 2 mass%. In consideration of the variation of kc with C_T, mass change of wustite sample with reaction time was estimated reasonably with the reaction model proposed by the authors previously.
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