Difference between roasting and calcination??
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roasting-heating in presence of excesss air
calcination- heating in presence of limited air
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Roasting: Roasting is a process in which ore is heated below its melting point in presence of air to oxidise the impureties.
Calcination: Calcination is the process of heating the ore below ots melting point an absence of air to absence of air to remove volatile impurities like arsenic etc.
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