Question

roasting and calcination full define ​

Answer 1

Roasting is the process in which the ore is heated below its melting point in presence of air to oxidise the impurities. ...

 Calcination is the process of heating the ore below its melting point an absence of air to remove volatile impurities like arsenic etc.

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Answer 2

Roasting is a process of heating the concentrated ore to a high temperature in presence of air. Generally, sulfide ores are roasted.

Example:

2 ZnS + 3 O2 → 2 ZnO + 2 SO2

Calcination is a process of heating ore in the absence of air to a high temperature but insufficient to melt the ore. Generally, carbonates and hydrated ores are calcined.

Example:

ZnCO3 → ZnO + CO20