H_2-N_2 ならびに CO-N_2 混合ガスによる酸化鉄 (Fe_xO) ペレットの還元速度の未反応核モデルによる解析(高炉内反応の基礎とモデル)(<特集>製銑)

概要

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Reduction experiments of wustite pellets with H_2-N_2 and CO-N_2 gas mixtures of various compositions were carried out at 1000℃. The wustite pellets were prepared by partial reduction of pure hematite pellets (about 3.9 g in weight, about 0.62 cm in radius, and 0.20∿0.25 in porosity) in 50%CO-50%CO_2 gas mixture at 1000℃. The rate parameters contained in the unreacted-core model were determined by applying the methods of the mixed-control plot and the data-fitting to the reduction data. In the reduction with H_2-N_2, the rate parameters for both the reactant gas and the product gas should be estimated. The relation between the effective diffusion coefficient in the product layer and the N_2 gas concentration X_<N_2>, is explained in terms of the dependency of the ternary diffusion coefficient on X_<N_2>, but the relation between the apparent chemical reaction rate constant and X_<N_2> cannot be solely explained by that effect. The change of the specific surface area of solid reactant during the reduction should also be taken into account. In the reduction with CO-N_2, the effect of N_2 gas concentration on the reduction mainly results from the change of the driving force of the reduction.
1982-11-01