溶鉄中の硫黄の活量

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The equilibrium of sulphur dissolved in liquid iron with the H_2-H_2S mixture was studied at 1500°-1650℃ in a resistance furnace or an induction furnace. As the discrepancy was observed among the results obtained by previous reseach groups, the effects of addition of argon to the gas mixture, of the flow rate and the preheating of the gas mixture on the apparent equilibrium constant of the following reaction were checked by applying different heating units : H_2(g)+S__-=H_2S(g). Except heating of metals, the same procedures were applied each for the preparation of the H_2-H_2S mixture, the flow rate of the gas mixture, and the sampling of liquid iron. The results obtained in this study show that a resistance furnace is preferable for the study of this system. The results obtained in the resistance furnace are as follows : logK(=P_<H_2S>/P_<H_2>・a_s)=-1830/T-1.60±0.00_9 ⊿G°=8372+7.32T±0.04T (cal/mole). The activity coefficient of sulphur dissolved in liquid iron decreases with increase in its concentration, and log f'_s is expressed by the following equation : log f'_s=(-120/T+0.018)・[%S].
社団法人日本鉄鋼協会の論文
1981-04-01