★ Define roasting and calcination?
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Roasting is a separation technique for sulphide ores of middle reactivity series of reactivity table.
Calcination is process of separation of carbonate ores of middle reactivity series.
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Roasting:- the process in which the ore is heated below its melting point in presence of air to oxidise the impurities.
calcination:-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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