Abstract
As one of a series of investigations designed to establish the mechanisms of mass transfer via gas phase at the melting zone in the blast furnace, thermodynamic and kinetic investigations of S transfer from or into molten iron via gas phase has been carried out.It is clarified from the thermodynamic considerations that the molten iron is desulphurized not only by slag-metal reaction in the hearth, but also by gas-metal reaction when the molten iron is descending through the melting zone. S in metal is removed from the molten iron to gas phase as S2 or CS2 etc, and to slag phase as sulphides by gaseous alkali or alkaline earth metals produced at high temperature zone.From the experimental results on the desulphurization kinetics of the molten iron by Mg gas, it is observed that the rate of desulphurization is considerably rapid.
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