Method of Estimation of Reduction Rate Constant in Ishida-Wen’s Model for FeO–Al₂O₃ Briquette

Abstract

A new estimation method of reduction rate constant in Ishida-Wen’s model, which be considered forming of reaction layer, for oxide aggregate such as sinter ore is proposed. Briquettes of FeO–Al₂O₃ mixture were prepared as a model of sinter ore and reduction test and analysis were taken place. Al₂O₃ cannot be reduced under this experimental condition so that it acts as a neutral material which obstruct reduction of FeO. Therefore, the influence of existence of Al₂O₃ in FeO–Al₂O₃ briquette on the reduction rate of FeO becomes clear. FeO–Al₂O₃ briquettes were reduced by H₂ at 1173 K, and reduction rate constant k_v were defined by Murayama’s method. As a result, k_v of FeO–Al₂O₃ briquettes can be described as k_v=ϕ^FeOk_v°, where ϕ^FeO is volume ratio of FeO in FeO–Al₂O₃ briquette and k_v° is reduction rate constant of pure FeO briquette.