The rates of sulphur transfer from gas to liquid slags were studied under reducing atmosphere. Ar-H
2S gas mixture was introduced over those liquid slags, such as CaO-SiO
2, CaO-Al
2O
3, and CaO-SiO
2-Al
2O
3 slags at 1550°C.
The results are as follows:
1) The rates of sulphur transfer from Ar-H
2S 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-SiO
2 were higher than those of CaO-Al
2O
3 system.
3) The rate of sulphur absorption of ternary slags of CaO-SiO
2-Al
2O
3 system in a graphite crucible could be represented as a function of the activities of CaO and SiO
2. A linear relationship was obtained between the rate of sulphur absorption and the activity of CaO, with the activity of SiO
2 as a parameter. In addition, it was generally observed that the rates increased by increasing the activity of SiO
2 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 SiO
2 by graphite accelerated the sulphur transfer, the dissolution of graphite into liquid slag retarded it.
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