CH_4-H_2-H_2O および CO-CO_2 系におけるアイアンカーバイドの相平衡

概要

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Phase diagrams of Fe, FeO, Fe_3O_4, Fe_2C and Fe_3C in CH_4-H_2-H_2O and CO-CO_2 gas mixtures were made by using thermodynamic data at every 50℃ in the temperature range from 550 to 850℃. On the basis of these diagrams, experimental conditions were determined. The reaction experiments were carried out by using fluidized bed or fixed bed reactor with the sample of two kinds of ore (dense and porous, 0.4-0.5 mm in diameter). The thermodynamic date used can be recommended because the experimental results under some conditions near the main phase boundary agreed well with the estimated one. It was confirmed that Fe_3C was produced via Fe_3O_4 in CO-CO_2 gas mixtures at 550℃. However, the reaction rete was very slow. This Fe_3C hardly decomposed to Fe and C. When the steam of 5 vol% or more was included in the CH_4-H_2-H_2O gas mixtures, Fe_3C was not generated in 0.1 MPa at all.
社団法人日本鉄鋼協会の論文
1999-01-01