6.8 Write chemical reactions taking place in the extraction of zinc from zinc blende.

Answers (1)

Chemical reactions in the extraction of zinc from zinc blende -

After concentration of ore (removal of gauge from zinc blend (ZnS) by froth floatation method).

Conversion to the oxide by the roasting method -

2ZnS+3O_{2}\rightarrow ZnO+2SO_{2}

Extraction of zinc from zinc oxide (by reduction)

ZnO+C\overset{673K}{\rightarrow}Zn+CO

Electrolytic refining of impure zinc (electrolyte used is acidified zinc sulphate ZnSO_{4})

Anode- Zn\rightarrow Zn^{2+}+2e^{-}

Cathode (made of the pure copper strip)-   Zn^{2+}+2e^{-}\rightarrow Zn

 

 

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