Abstract
Current efficiency and current density-overvoltage relation at the electrode of solid Fe/40CaO-40SiO2- 20Al2O3 (mass%) molten slag with 0.55-10 mass% of total iron oxide were measured in Ar at 1 573 K. Pt-air/ZrO2-9 mol%MgO electrode was used as a reference electrode. The current efficiencies of Fe=Fe2++2e were 1.0 for anodic polarization within 200 mV and gradually decreased to 0.67 at 600 mV, but were zero for cathodic polarization. From the current efficiencies, it was concluded that anodic reaction was Fe→Fe2++2e including Fe2+→Fe3++e above 200 mV, and from the analysis of current density-overvoltage relation, it was estimated that cathodic reaction was the reduction of oxygen dissolved inmolten slag.
