Rate of Desulphurization of Molten Iron by Slag under Reducing Condition

The rate of transfer of sulphur across a metal-slag interface under reducing condition was studied at the temperature range from 1, 440°to 1, 570℃. Radioactive sulphur, S^, was used to improve the accuracy of the experiment. The net rate of transfer of sulphur from metal to slag increases with increasing basicity of the slag and with temperature. This is ascribable to the fact that the rate of transfer of sulphur from metal to slag increases rapidly with increasing basicity of slag and with temperature, while that from slag to metal does not change appreciably with change in slag composition and temperature. In the case of high viscosity slags, the rate of transfer of sulphur was interpreted on an assumption that the transfer is the reaction of the first order, but this assumption was inadequate for explaining the experimental results obtained with low viscosity slags. The rate of transfer of sulphur seems to be affected remarkably by side reaction