Difference between Roasting and calcination? Which of the two is used for Sulphide ore and why?
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Roasting is a process which is done in presence of air. And Calcination is a process which is done in absence of air. Generally, Roasting is used for sulphide ores
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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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