<報文>SiO_2の還元に関する電気化学的研究

概要

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Electrochemical measurements on the cathodic reaction of silica reduction at the slag-metal interface and the anodic reaction of CO evolution at the slag-graphite interface were carried out. In the case of the cathodic reaction of silica reduction in the CaO-SiO_2-MgO slag, the charge transfer process is the rate-determining step in the region where the reaction current density is below 100mA/cm^2. As the reaction current increases, the diffusion process of Si in slag becomes significant. The exchange current density of the cathodic reaction of silica reduction obtained by extrapolating the Tafel line to the natural electrode potential is 15 mA/cm^2. The kinetics of CO evolution reaction at the slag-graphite interface is considerably influenced by the properties of graphite electrode used. The charge transfer process of the anodic reaction is the rate-determining step in the region where the reaction current is more than 500 mA /cm^2. The exchange current densities of the anodic reaction of CO evolution on various graphite electrodes referred to natural electrode potential do not exceed 10 mA/cm^2.
東北大学の論文
1972-03-25