溶融酸化硫化鉄の水素還元における化学反応速度

概要

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Iron oxysulfide melt saturated with iron was reduced in N_2-H_2 mixtures at 1000∿1300℃ using a thermobalance to obtain both chemical reaction parameters concerning deoxidation and desulfurization of the melt with hydrogen. Gas mixture flow rate of 2∿4 l/min was employed to lower mass transfer resistance in gas phase. Decrement of overall reaction rate using hydrogen diluted by nitrogen (P_<H_2>=0.020∿0.30 atm) was of advantage to avoid forming of melt and clarify reaction area. Both the rate parameters were obtained in consideration of mass transfer resistance in gas phase estimated by a dimensionless equation. The parameters of deoxidation depended on temperature, not on oxygen activity in melt of 0.20∿0.55, and amounted to nearly one tenth less than those extrapolated from the results of liquid wustite by earlier workers, while the influence of sulfur diminished with increasing temperature. The parameters of desulfurization were nearly two orders magnitude lower than those of deoxidation and rised with increasing sulfur activity in melt of 0.64∿0.93 and temperature. The deoxidation process of wustite in coexistence of the melt showing extremely reaction retardation is discussed kinematically.
社団法人日本鉄鋼協会の論文
1991-05-01