Calcination and roasting are pre treatments in metallurgy before metal extraction. Differentiate between calcination and roasting?

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Solution

Roasting Calcination
Ore is heated in presence of excess oxygen or air Ore is heated in absence or limited supply of oxygen
This method is used for suphide ores. This method is used for carbonate ores.
Suphur dioxide is produced along with metal oxide. Carbon dioxide is produced alonh with metal oxide
Eg. $Z n S$ Eg. $Z n C O_{3}$

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Roasting	Calcination
Ore is heated in presence of excess oxygen or air	Ore is heated in absence or limited supply of oxygen
This method is used for suphide ores.	This method is used for carbonate ores.
Suphur dioxide is produced along with metal oxide.	Carbon dioxide is produced alonh with metal oxide
Eg. $Z n S$	Eg. $Z n C O_{3}$