加圧下微量H2S含有H2-CH4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 pressurized H_2-CH_4 mixtures (1-3 atm) at 800-900℃ to produce iron carbide in the pellets. H_2S having 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 (soot) or metallic iron as final products with nearly complete carbide conversion. The higher the temperature and the pressurization, the larger the carbidization rates. The tests without H_2S gave lower iron carbide contents with much soot or metallic iron. The addition of oxidant CO_2 or H_2O into gas suppressed iron carbides and soot. Initial carbidization rates ofa 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