Volatile metals like Zn, Cd and Hg are generally purified by

Distillation process is used to those metals which are easily volatile this is used for the purification of Zn, Cd, Hg. Distillation method is used to refine metals which having low boiling points.

$\mathrm{Ex}:\mathrm{Zn},\mathrm{Cd},\mathrm{Hg}$