合成鉄クロマイトペレットの水素還元速度

概要

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Experiments have been made of the reduction of synthetic FeCr_2O_4 pellet with hydrogen in a temperature range from 800℃ to 1300℃. The reduction of FeO component preceded that of Cr_2O_3, and it proceeded topochemically under the formation of relatively clear interface between reduced shell (γ-Fe+Cr_2O_3) and unreacted core. In the reduction stage of Cr_2O_3 component, the reaction interface was considerably widely. diffused. Kinetic analysis based on an unreacted core model was conducted with the reduction stage of FeO component, and the rate constant of chemical reaction k_r and the intraparticle diffusivity D_e were evaluated. The activation energy of the chemical reaction was about 30kcal/mol. The temperature-dependency of D_e was very strong, especially at temperatures above 1200℃.
社団法人日本鉄鋼協会の論文
1986-03-01