Question

Define roasting and calcination process and give one example for each

Answer 1

Roasting : Sulphide ore is strongly heated in the presence of air and is converted into metal oxide.
2ZnS + 2O2 heat----> 2ZnO + 2SO2

Calcination : Carbonate ore when heated strongly in the absence of air is converted into metal oxide.
ZnCO3 heat----> ZnO + CO2

Answer 2

Question:

Define roasting and calcination process and give one example for each.

Answer:

When a sulphide ore is heated to a high temperature in presence of air, the process is termed as roasting. This method is one of the things done while processing an ore. Before roasting, generally the ore is purified. Some ores in the processing of which roasting is done are: Copper Sulphide($Cu_{2}S$) and Zinc Sulphide($Zn_{}S$)

Calcination is the process in which a substance is heated to a high temperature when air is absent. This process is done to ores as well. This process is done to remove volatile impurities from ores. Some ores on which calcination is done: Calcium Carbonate($CaCO_{3}$) and Zinc Carbonate($ZnCO_{3}$)

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