mention difference between calcination and roasting.how these process are used in the extraction of zinc
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In calcination ore is heated in the absence of airbut in roasting ore is heated in the presence of air
Calcination of zinc
Zinc carbonate in the form of Calamine ore is heated strongly in the absence of air because of which the Calamine ore get calcined and it decomposes to form zinc oxide and and carbon dioxide.
ZnCo3(s) ------------ ZnO(s) + CO2(g)
Roasting of zinc
Zinc sulphide in the form of Zinc blende ore is strongly heated in the presence of air because of which it forms Zinc oxide and Sulphur dioxide.
2ZnS (s) ----------- 2ZnO(s) +2SO2(g)
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