A theoretical analysis has been made on the metal-side mass-transfer in a slag-metal reaction system with gas-injection stirring. Considerations have been given of the fluid flow in the vicinity of the slagmetal interface. On the basis of a theory of turbulence phenomena, metal-side mass-transfer coefficients are derived as functions of gas-injection stirring conditions. The theoretical equations are rearranged to dimensionless correlation equations.
The mass-transfer data obtained by the authors for molten slag-Cu reaction system of Si oxidation by FeO at 1250°C and the available data of model studies at low temperature (aqueous solution-amalgam system at room temperature and molten salt-molten Pb system at 450°C) are correlated successfully by the equations obtained in the present study. It is found that the dimensionless correlation equations obtained in the present study are applicable to the data of ladle desulfurization, as far as the rate is controlled by the mass-transfer in the metal phase.
