differentiate between calcination and roasting
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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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The process of conversion of the concentrated ore to it's oxide at a high temperature in the presence of excess air is called calcination. Usually carbonate ores are roasted ,therefore carbon dioxide is evolved.
whereas,
the process of conversion of the concentrated ore to it's oxide at a low temperature in the absence of air is called roasting.Usually sulphide ores are roasted and therefore ,sulphur dioxide is evolved.
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