1985 Volume 26 Issue 2 Pages 108-114
The present study is concerned with the kinetics of carbon reduction of MnO and the identification of Mn carbide formed in this reduction process by the effluent gas analysis method. Mn carbide (Mn7C3) was formed at an earlier stage of reduction, and the activation energy of 217 kJ/mol nearly equal to that for the Boudouard’s reaction was obtained. When carbon was consumed entirely, the reaction between MnO and Mn7C3 occurred to yield metallic manganese, and the activation energy of 259 kJ/mol corresponding to the reaction of CO2 with Mn7C3 was obtained. Mn carbide formed in the reduction process of MnO was identified to be Mn7C3 phase, by the effluent gas analysis method using the He-O2 mixture. In addition, EPMA and X-ray diffraction examinations showed the presence of Mn7C3 phase in this reduction product.
