Decarburization of iron-carbon alloys with oxidising slags.

-4 cm/sec at 1400°C. It has notbeen possible to establish a precise correlationfor the mass transfer coefficients with the simple models formass transfer proposed by other authors. The generation ofcarbon monoxide gives rise to a situation which is very complex to describe in terms of mathematical models. Nevertheless theexperimental kinetics have been discussed in relationship tothe classical film theory for mass transfer across an interfacebetween two phases. This has allowed conclusions to be drawnabout the rate controlling step of the overall mechanism of transfer, some agreement between experimental data and the model has allowed estimates to be made of relative velocity between slag and metal, Sh, Gr and Re numbers. In addition, the penetration theory has also been examined, and analysis indicated that it has some potential applicability to this type of system. Finally, the discussion suggests that Danckwerst surface renewal adaptation of the penetration theory is worthy of future examination.