What is roasting and calcination?
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Calcination. Roasting. Calcination is a process where the air might be supplied in limited quantity, or the ore is heated in the absence of air. Roasting includes heating of ore lower than its melting point in the presence of oxygen or air. Calcination involves the thermal decomposition of carbonate ores.
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Roasting :
The process of converting sulphide ores into oxides by heating strongly in the presence of excess of air.
Calcination :
The process of converting carbonate ores into oxides by heating them strongly in the limited supply of air.
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