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What is the difference between roasting and calcinations? give some example for each

 

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Roasting is the process in which the ore is heated below its melting point in presence of air to oxidize the impurities. Ex: carbon, sulfur etc removed as their gaseous oxides.

Calcination is the process of heating the ore below its melting point in absence of air to remove volatile impurities like arsenic etc. 

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