Question

Differentiate between roasting and calcination

Answer 1

Roasting is the process in which the ore is heated below its melting point in presence of air to oxidise the impurities. ... Calcination is the process of heating the ore below its melting point an absence of air to remove volatile impurities like arsenic etc.

Answer 2

$\huge\mathfrak{Hey\:Mateyy}$

$\huge\texttt {Roasting:-}$

1. It is done in the presence of excess of oxygen or air.

2. This method is employed for sulphide ores.

3. Sulphur dioxide is produced along with metal oxide.

4. REACTION :- 2ZnS + 3O2 => 2ZnO + 2SO2

$\huge\texttt{Calcination:-}$

1. It is done in the absence or limited supply of oxygen or air.

2. This method is employed for carbonate ores.

3. Carbon dioxide is produced along with the metal oxide.

4. REACTION :- ZNCO3 => ZnO + CO2

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