13Calcination is done for hydrated oxides and carbonates.
Roasting is applied to sulphides
Pl. mention the imp. points of Extraction of varoious elements here........
Main points cud include :
Purification, Main Method of exctraction, Concentration n Purification........
Self-Reduction n Carbon reduction r imp.
Lead is Self - Reduced!!
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3 Answers
11calcination is only a purification technique in which the ore is converted to the oxide (also the volatile matter escapes ).
it's used in case of Al,Fe,Zn,Ca.
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