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Differentiate between roasting and calci...

Differentiate between roasting and calcination.
Explain the two with the help of suitable chemical equatiosn. How is zinc extracted from its ore?

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Roasting, It is a process in which sulphide ore is heated in the presence of oxygen to convert into oxide.
`2ZnS+3O_(2)to2ZnO+2SO_(2)`
Calcination: It is a process in which carbonate ore is heated in the absence of air to form oxides.
`ZnCO_(3)(s)overset("heat")(to)ZnO(S)+CO_(2)`
By reduction process. Zn can be extracted from its ore.
Reduction : `2ZnO+ctoZnO+CO_(2)`
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