Question

What do you mean by calcinations and Roasting?

Answer 1

Calcination: It is the process of converting ores to the oxide by strongly heating it in the limited air. For example, carbonate ores are converted into the oxide by heating in the absence of air.

Roasting: It is the process of converting ores to the oxide by strongly heating it in the presence of an excess of air. For example roasting, $ZnS$ may yield $ZnO$.