微量 H_2S 含有 H_2-CO 混合ガスによるペレット状炭化鉄の生成挙動

概要

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Using a thermobalance, a hematite pellet was reacted with H_2-CO mixtures at 973∿1073K to produce an iron carbide pellet. H_2S of low pressures unable to form FeS was added to the mixtures. First, reduction of iron oxides proceeded and then carbidization of metallic iron occurred. Small amounts of H_2S in gas led to iron carbides (Fe_3C, Orthorhombic) with complete conversion rather than free carbon or metallic iron as final products. In later stage of carbidization, higher iron carbide (Fe_<2.5>C, Monoclinic) appeared partially in lower temperatures. The conditions of higher temperature and low sulfur pressure provided high quality iron carbides having nearly less than 0.03 mass%S. The tests without H_2S provided lower iron carbide contents with much free carbon or metallic iron. Carbidization rates of a reduced iron pellet were analysed by an unreacted core model to investigate this process. The carbidization proceeded more rapidly in lower temperatures.
社団法人日本鉄鋼協会の論文
1999-03-01