回分式流動層におけるヘマタイト粉鉱石の CO-CO_2 混合ガスによるマグネタイトへの還元の反応速度解析

概要

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Hematite powders were reduced to magnetite with CO-CO_2 gas mixtures in a batch-type fluidized bed under the conditions of 700∿900℃ in temperature, 0.15∿0.23mm in particle size, 2.67×10^<-5>m^3/s (STP) in gas flow rate. The reduction curves were analyzed based on the bubble assemblage model and the perfect mixing model. It was concluded from the results of analysis that the bubble assemblage model was more suitable for the analysis. In those models, the unreacted-core models for sphere or plate were used for the reduction model of single particle. The rate parameters included in the unreacted-core model were determined by using the reduction data. The value of chemical reaction rate constant did not vary with the model for sphere or plate. However, the value of intraparticle diffusion coefficient in the model for plate was smaller than ones in the model for sphere.
社団法人日本鉄鋼協会の論文
1992-10-01