Distinguish between calcination and roasting 0
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Calcination is the heating of substances in absense of oxygen
Roasting is the heating of substances in presence of oxygen
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Roasting is the process in which the ore is heated below its melting point in presence of air to oxidise the impurities. eg: carbon, sulphur etc removed as their gaseous oxides. Calcination is the process of heating the ore below its melting point an absence of air to remove volatile impurities like arsenic etc.
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