Differentiate between calcination and roasting.
Calcination is the process of heating the ore below its melting point in absence of air to remove
volatile impurities like arsenic etc.
Roasting is the process in which the ore is heated below its melting point in presence of air to oxidise the impurities. Ex: carbon, sulphur etc removed as their gaseous oxides.
1. In the process of roasting, ore is heated above its melting point in the presence of air or oxygen while in calcination, ore is heated above its melting point in the absence of air or very limited amount of oxygen supply
2. Roasting is mostly done for sulphide minerals while calcination is mostly applied in decomposition of carbonate ores.
3. Roasting is not used for dehydrating an ore while calcination can be used to drive out moisture from an ore.
4. In roasting, sulphur dioxide is released while in calcination carbon dioxide is released.
Calcination is the process of heating the ore below its melting point in absence of air to remove
volatile impurities like arsenic etc.
Roasting is the process in which the ore is heated below its melting point in presence of air to oxidise the impurities. Ex: carbon, sulphur etc removed as their gaseous oxides.
1. In the process of roasting, ore is heated above its melting point in the presence of air or oxygen while in calcination, ore is heated above its melting point in the absence of air or very limited amount of oxygen supply
2. Roasting is mostly done for sulphide minerals while calcination is mostly applied in decomposition of carbonate ores.
3. Roasting is not used for dehydrating an ore while calcination can be used to drive out moisture from an ore.
4. In roasting, sulphur dioxide is released while in calcination carbon dioxide is released.
