Difference between roasting and calcination class 10

If you are looking for the difference between roasting and calcination then you are at the right place.

Before we know the differences between and calcination, we must know what roasting and calcination are?

   1.   What is calcination?

   2.   What is roasting?

 Difference between roasting and calcination

The following methods are used in the conversion of concentrated ores into metal oxide

i.   Calcination

ii.  Roasting

What is calcination?

Calcination is the process of heating ore in the absence of oxygen(air) below the melting point of ore.

Calcination is used to decompose carbonate ores and hydrated ores into oxide ores.

Example

Water present in the hydrated ore is removed by calcination

(i) `Al_2O_3. 2H_2O →Al_2O_3 + 2H_2O↑`

(ii) `ZnZO_3 →ZnO + CO_2↑`

What is roasting?

Roasting is the process of heating the ore in the presence of air at a temperature below the melting point of the ore.

Roasting is used to convert sulphide ore into oxide ore.

`Zns →ZnO + SO_2↑`

 Difference between roasting and calcination table

Roasting	Calcination
Ore is heated  in the presence of oxygen(air) in this process.	In this process, ore is heated below its melting point in the absence of oxygen(air)
This process is used for sulphide ores	This process is used for carbonate and hydrated ores.
Moisture is present in this process.	Moisture is removed during this process.
Sulphide ore →oxide ore	Carbonate ore →oxide ore