Activity of Sulphur in Liquid Iron
1981 Volume 67 Issue 6 Pages 736-745
Details
1981 Volume 67 Issue 6 Pages 736-745
The equilibrium of sulphur dissolved in liquid iron with the H2-H2S mixture was studied at 1500°-1650°C 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:
H2(g)+S=H2S(g).
Except heating of metals, the same procedures were applied each for the preparation of the H2-H2S 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(=PH2S/PH2·αs)=-1830/T-1.60±0.009
ΔG°=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:
logf's=(-120/T+0.018)·[%S].
