The process take advantage of the relatively low boiling point of zinc (907 °C (1,665 °F)) as compared to the impurities being removed in the first "column": iron and aluminium.
Therefore, in the first column the zinc is heated above its boiling point and allowed to rise to a condenser.
The iron and aluminium impurities sink to the bottom in the form of a solid or liquid.
In order to remove the lead 2-3% of the vapor is condensed, which draws the majority of the lead out of the vapor; down to the point where it is only 0.003% of the total contents.
Finally the vapor is pumped into the cadmium column where it is cooled to an intermediate temperature below the boiling point zinc, but still above the boiling point of cadmium (767 °C (1,413 °F)).