Solution 8:
The following processes are involved in the extraction of zinc from zinc blende:
(i) Concentration: Zinc blende ore is crushed and the concentration done by froth- floatation process.
(ii) Roasting: The concentrated ore is then roasted in presence of excess of air at about
zinc blende zinc oxide
(iii) Reduction: Zinc oxide obtained above is mixed with powdered coke and heated to
At
(iv) Electrolytic refining: Impure zinc is made the anode while pure zinc strip is made the cathode.