Question

differentiate between roasting and calcination used in metallurgy

Answer 1

heating of ore in presence of air is roasting . only sulphide ores and heating the ores in absence of air is calcination. only carbonate ores

Answer 2

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Source : https://brainly.in/question/2537405

The conversion of sulphides and carbonates to their oxides is done by two processes - Roasting or Calcination.

1. For sulphide ores - Roasting
Roasting is the process in which the concentrated ore is heated in excess air.

2ZnS + 3O2 ---> 2ZnO + 2SO2
2FeS2 + 11O2 ---> 2Fe2O3 + 8SO2

2. For carbonate ores - Calcination
Calcination is the process in which the concentrated ore is heated in the absence of air.

ZnCO3 ---> ZnO + CO2
FeCO3 ---> FeO + CO2

Hope it helps!