what is the difference between calcination and roasting. with suitable chemical equation how is .zinc extracted from its ore.
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Calcination--It is the process in which the carbonate Ore is heated in the absence of air below its fusion temperature is known as the calcination.
Eg:- CaCo3------Cao+co2
Roasting--sulphide Ore is heated in the presence of air below its fusion temperature.
Eg:-ZnS+O2-----ZnO+SO2
zinc sulphide is an sulphide ore so so it's extraction is done by step wise method:-
Step:-1-first zinc sulphide is heated in the presence of air known as roasting to remove the the sulphur from it.
- ZnS+O2---ZnO+SO2
Step:-2- zinc is the metal of medium reactivity so it is easily reduced by the use of coke.
- ZnO+C---Zn+Co
Step:-3-now zinc is purified or electrolyte to remove the impurities present in Ore.
Hope it helps bro..
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