Question

DescribeRoasting and calcidation with 2 examples

Answer 1

calcination -when a carbon ore is heated with limited amount of oxygen.
roasting-when a sulphide ore is heated with huge amout of oxygen to obtain pure metal

Answer 2

Roasting -:

Roasting is the process in which the ore is heated below its melting point in presence of air to oxidise the impurities. eg: carbon, sulphur etc removed as their gaseous oxides.

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.

ZnCO3 -----> ZnO + CO2

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