Extraction of Zinc from Zinc blende:
The extraction of Zinc from Zinc blende includes the steps shown below:
1. Concentration:
The ore is at first crushed and then concentrated by froth-floatation procedure.
2. Roasting:
The concentrated ore is then roasted in the existence of surplus of air at around 1200 K.
3. Reduction:
Zinc oxide is mix with powdered coke and then heated to 1673 K in a fire clay retort, in which ZnO is diminished to zinc metal.
Purification:
Zinc is purified by electrolytic refining. In this procedure, Impure Zinc is anode and cathode is of pure thin sheet of Zinc. The electrolyte is ZnSO4 solution having a little of dil. H2SO4. On passing electric current, the pure zinc gets deposited at cathode.
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