微量H_2S含有H_2-CH_4混合ガスによるペレット中炭化鉄の生成挙動

概要

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Using a thermobalance, industrial hematite pellets were reacted with H_2-CH_4 mixtures at 800∿950℃ to produce iron carbide in the pellets. H_2S of low pressures unable to form FeS was added to the mixtures. First, reduction of iron oxides proceeded and meanwhile carbidization of metallic iron took place. The addition of traces of H_2S into gas promoted iron carbides (Fe_3C, Orthorhombic) rather than free carbon or metallic iron as final products with nearly complete carbide conversion. The higher the temperature, the larger the carbidization rates. The sulfur index in gas around i_S=0.05 provided high yields of iron carbides with low sulfur content of less than 0.05 mass% S. The tests without H_2S gave lower iron carbide contents with much free carbon (soot) or metallic iron. Initial carbidization rates of a reduced iron pellet coincided with a reaction rate model proposed earlier by Grabke.
社団法人日本鉄鋼協会の論文