2021 年 61 巻 10 号 p. 2513-2523
The effects of the ambient temperature, gas flow rate and carbon content in the brick on the behaviour of the MgO–C reaction, which is an inherent phenomenon of MgO–C bricks, were investigated. As a result, the amount of the MgO–C reaction increased as the carbon content in the brick and the temperature increased, but was not significantly changed by increasing the gas flow rate. The apparent activation energies for the following reactions were determined from the results of this study and the results of previous reports.
CO(g) + MgO(s) = Mg(g) + CO2(g) E = 348 kJ / mol
CO2(g) + C(s) = 2CO(g) E = 296 kJ / mol
A new MgO–C reaction model was developed based on the shrinkage core model in order to discuss the effects of the temperature and carbon content in the brick quantitatively. The reaction model in this study could explain not only the results of the present study but also the results reported previously by other researchers. In addition, the effect of the particle diameters of MgO and carbon on theMgO–C reaction is also discussed using the reaction model proposed in this study.
