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Roasting and calcination are the methods to extract crude metals from ores. What is the difference between roasting and calcination ?

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Roasting and calcination are the methods to extract crude metals from ores. What is the difference between roasting and calcination ?

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Roasting is a process of heating the ore strongly in a free supply of air or oxygen. Calcination is a process of heating the ore strongly in the absence of air or oxygen.

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