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.
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
11
13Calcination is done for hydrated oxides and carbonates.
Roasting is applied to sulphides