Abstract
The effect of interfacial tension on the kinetics of the dephosphorisation of iron has been investigated. X-ray monitoring of the shape of a molten iron droplet in liquid slag showed that there was a marked reduction in the interfacial tension γms during periods of rapid mass transfer and an increase in γms as the mass transfer process slowed down, similar to that observed for desulphurisation. The dephosphorisation kinetics was found to be first order with respect to phosphorus in the liquid iron and implied that, for the system studied, mass transfer of phosphorus in the slag phase is the rate controlling step.
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