Ar-CO-CO_2 混合ガスによる溶鉄の脱炭反応

概要

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The present paper deals with a kinetic study of decarburization of liquid iron in Ar-CO-CO_2 atmospheres at 1600℃. The study has been especially devoted to determining the rate-controlling step at low carbon contents of the melt. At concentrations of carbon highr than 0.02∿0.05%, the rate of decarburization is controlled primarily by gaseous mass transfer. At concentrations of carbon lower than 0.02∿0.05%, the rate of decarburization no longer depends on the gas flow rate, if it is higher than 1300cc/min. The rate-controlling step of decarburization under this condition varies according to the composition of Ar-CO-CO_2. Chemical reaction becomes important in rate-controlling mechanism as the partial pressure of Ar or CO in the gas mixture increases, while mass transfer of carbon becomes important as the partial pressure of CO_2 increases. In the range of chemical reaction control, the experimental reasults are explained reasonably by the model based on the simultaneous reactions : CO_2+C__-⇄2CO, CO_2⇄CO+O__-, C__-+O__-⇄CO. In the range of mass transfer control, the value of mass transfer coefficient of carbon is the same as that for the decarburization by CO-CO_2 and Ar-CO_2. It is concluded that the mechanism of decarburization by CO-CO_2 and Ar-CO_2, previously studied, can be explained on the basis of the present study.
社団法人日本鉄鋼協会の論文
1974-03-01