Refining process of zinc

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Zinc Refining:

 - The zinc obtained by the process is impure and contain largely cadmium along with it. The impure is zinc is Known as spelter. Pure Zn obtained by Fractional distillation were Cd being more volatile (b.pt 775°C) than Zn (b.pt 906°C) distills over leaving behind pure Zn.
             Zn can also be purified by electrolytic method. In this method impure Zn is made anode, pure Zn plate is made cathode and ZnSO⁴ solution containing little sulphuric acid is used as electrolyte. On passing electricity pure Zn is deposited at the cathode.

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