Write the differences between roasting and calcination.

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Solution

Roasting is the process in which the ore is heated below its melting point in presence of air to oxidize the impurities.
Eg: carbon, sulphur, 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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Giving examples, differentiate between ‘roasting’ and ‘calcination’.

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