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Wednesday, June 26, 2019


Ore is heated strongly in absence or limited supply of air (air is used here as carrier of heat and moisture).Calcination process temperature is below melting point of treated ore. This process of calcination brings about the following changes.
(1) The Carbonate ore gets decomposed to form the oxide of the metals for example
(2) Water of crystallisation present in the hydrated oxide ores are gets lost as moisture as
Consequence of Calcination:
(1) Volatile products like water vapour / CO2 are removed and ore become porous
(2) Organic impurities decomposes into smaller volatile products
Note:  Both calcination and Roasting are generally carried out in a Reverbatory furnace. In case of roasting, the air holes are kept open while they are partially or completely closed during calcination.

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