<報文>焼結鉱の水素還元反応速度

概要

論文の詳細を見る
In order to obtain the rate parameters for applying to process analysis, the experiments of reduction of iron ore sinter in comparatively small size was carried out with hydrogen gas. Furthermore, the reduction rate of iron ore sinter in large size was estimated by using the rate parameters obtained above. The results were summarized as follows. 1) The estimation of gas film resistance was insufficient, but after the value of gas film resistance which was estimated according to Ranz-Marshall's equation was subtracted from the overall resistance of reduction, the rate parameters were obtained by using the mixed control equation including both chemical reaction and intraparticle diffusion processse. 2) It was recognized that the values of reaction rate constant, κ, was not so different among various types of sinters but the values of intraparticle diffusion coefficient, D_e, were different from one another. The value of D_e had a close correlation with the apparent density of iron sinter. 3) Macrostructure of partially reduced sinter showed that the reduction advanced topochemically, but the observed values on the reduction of iron ore sinter in large size did not agree with the theoretical calculation based on the unreacted core model. It was considered that the reason was due to the roughness of sinter surface, complexity of its particle shape and thereof plural number of unreacted cores.
1972-03-25