Question

Write down the Differences between Roasting and Calcination.

Answer 1

Roasting : It is the process of converting an ores to oxide by strongly heating it in the presence of excess of air . For example sulphide ores are converted into their respective oxide by heating in the presence of air.

eg : 2 ZnS +3O2 -------->  2 ZnO + 2SO2 .

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

eg : ZnCO3 -----> ZnO + CO2

Answer 2

You can get this even on NCERT textbook.