Consistent Recovery of Magnesium in A Ductile Iron Process!

Consistent magnesium and magnesium recovery have always been subjects for discussions amongst foundry people. This presentation summarises the most important factors that will affect the recovery and adding rate of magnesium in ladle treatment processes.

Factors influencing the Consistent Magnesium Recovery and Addition.

In order to evaluate the basics of ductile iron production the advanced mechanism of the graphite has to be considered. It is planned that growth normally occurs along the pole of the plane with the lowest interfacial energy in connection with the melt. This will be the plane with the highest packing density and this will have the main growth rate.

With surface-active elements like O and S present the prism plane will grow fastest, but if these elements are neutralised the basal plane will again have the highest growth rate.

The main growth rate from the basal plane will result in ductile iron and from the prism level in grey iron. Hence consistent Mg recovery is added in order to neutralise surface active elements such as Sulphur and oxygen.

This means that improved content of Sulphur and oxygen in base iron require advanced adding of consistent Mg recovery. An example presentation of the effect of higher Sulphur level in the base iron without increasing the count rate of MgFeSi.

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