1977 Volume 63 Issue 14 Pages 2299-2307
The rates of sulphur transfer from gas to liquid slags were studied under reducing atmosphere. Ar-H2S gas mixture was introduced over those liquid slags, such as CaO-SiO2, CaO-Al2O3, and CaO-SiO2-Al2O3 slags at 1550°C.
The results are as follows:
1) The rates of sulphur transfer from Ar-H2S gas mixture were proportional to the partial pressure of hydrogen sulphide, and also to the flow rate of the gas mixture.
2) If those slags were melted in a graphite crucible, the rates of sulphur absorption of binary slags CaO-SiO2 were higher than those of CaO-Al2O3 system.
3) The rate of sulphur absorption of ternary slags of CaO-SiO2-Al2O3 system in a graphite crucible could be represented as a function of the activities of CaO and SiO2. A linear relationship was obtained between the rate of sulphur absorption and the activity of CaO, with the activity of SiO2 as a parameter. In addition, it was generally observed that the rates increased by increasing the activity of SiO2 with the constant activity of CaO.
4) In view of other experimental results, it was also clear that the interfacial reaction between a graphite crucible and liquid slags would have some influences on the rates of sulphur transfer. Although the reduction of SiO2 by graphite accelerated the sulphur transfer, the dissolution of graphite into liquid slag retarded it.