<報文>石灰を含有する緻密なマグネタイトの還元反応速度

概要

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In order to obtain a better understanding of the effect of foreign oxide on the reduction rate of iron oxide, dense magnetite plates containing 0 to 3 wt pct CaO were reduced with CO-CO_2 mixtures in the temperature range of 800 to 1,000℃. The dense magnetite was obtained by oxidation of the wustite which was prepared in an iron crucible by melting a mixture of metallic iron, Fe_2O_3 and CaO. The reduction rate of dense magnetite was promoted remarkably by the addition of a small amount of CaO. The experimental results were analysed by the unreacted core model and the rate parameters for the sample used were determined. The activation energy of chemical reaction rate constant, k, of the pure dense magnetite was 3 to 4 times greater than that of dense magnetite containing CaO. The temperature dependence of k is given by the following equations : 2.68% CaO k=exp (8.53-14.8×10^3/RT) ; 0.89% CaO k=exp (6.38-12.4×10^3/RT) ; 0% CaO k=exp (19.41-48.6×10^3/RT).
東北大学の論文
1979-03-20