COS-CO 混合ガスによる還元鉄ペレットの硫化について

概要

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The rate of reaction of carbonyl sulfide with metallic iron was studied by measuring the ratt of sulfurization of sponge iron pellets in COS-CO gas mixtures at temperatures from 800℃ to 1000℃. The sponge iron pellets had been produced by hydrogen reduction of hematite pellets. The results obtained are as follows : 1) The product shell layers were proved to be nonstoichiometric ferrous sulfide having the atomic ratio of S/Fe=1.06. 2) Negligible amount of carbon was deposited on the pellets in the stream of 5% COS-CO gas mixture. 3) The sulfurization reaction was analyzed on the basis of the unreacted-core model and it was found that the reaction was controlled by the following three steps ; the gas-film mass transfer, the intraparticle gaseous diffusion, and the chemical reaction at the sulfide-iron interface. 4) The chemical reaction rate constant K_r and the effective intraparticle diffusion coefficient D_e are expressed respectively by the following Arrhenius type equations : log K_r=3.053-13400/2.3 RT log D_e=4.746-30430/2.3 RT It is noteworthy that temperature coefficient of D_e is fairly greater than that of K_r, which results in the predominant contribution of chemical resistance to the over-all resistance even in higher temperatures.
社団法人日本鉄鋼協会の論文
1978-12-01