熔鉄中の硫黄と H_2-H_2S 混合ガスとの平衡 : 熔鉄中の硫黄に関する熱力学的研究 I

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The equilibrium in the reaction between sulphur in molten iron and hydrogen gas has been studied by many investigators in various methods. In this investigation, using a carbon-tube resistance furnace and a gas-bubbling technique, the authors reestablished above equilibrium relation for the temperature range of 1550℃∿1750℃ and sulphur concentration up to 5% It is, generally, considered that in such a reaction between gas mixture and a constituent in molten iron, the bubbling of gas into melt is effective for the prevention of it from thermal diffusion and may shorten the time required for equilibrium. From the results of this experiment, the following equilibrium relation was obtained : H_2(g)+S__-=H_2S(g) logKs(=P_<H_2S>/P_<H_2>・as)=-3200/T-0.862 ⊿F°=14640+3.94T The values of equilibrium constant Ks were in good agreement with those of J. Chipman et al. below 1600℃, while considerable differences between both values were recognized above 1600℃. It was proved that the activity coefficient of sulphur in molten iron, that is f_s, decreased with the increase of its concentration, and an experimental equation indicating the relationship among the f_s, sulphur concentration and temperature was given as follows : log f_s=(233/T-0.153)[%S]
社団法人日本鉄鋼協会の論文
1958-06-01