Sulphide capacity and sulphur solubility in CaO-Al2O3 and CaO-Al2O3-CaF2 slags

摘要

The sulphide capacity and the solubility limit of CaS in CaO-Al2O3 and CaO-Al2O3-CaF2 slags have been studied at the temperatures from 1 823 to 1 923 K by the equilibrium measurement of gas-slag reaction. The sulphide capacity and the solubility of CaS in these two slag systems increase with increasing CaO content and decreasing ratio of N-Al2O3/N-CaF2. The sulphur in CaO-Al2O3-CaF2 slag negatively deviated from Henry's law in the high concentration range of sulphur in slag, and the activity coefficient of sulphur in slag varies with sulphur content, slag composition and temperature. It was confirmed that the sulphide capacity was unable to be applied as a real measure of the slag basicity theoretically.