還元性雰囲気下における溶融スラグの気相からの硫黄吸収

概要

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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℃. 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.
社団法人日本鉄鋼協会の論文
1977-12-01