Question

Write short notes on the following:

Roasting

Answer 1

1. Roasting is a process in metallurgy where sulphide ores are heated strongly in the presence of excess air.
2. During roasting, sulphide ores are converted into oxides by oxidation, releasing sulfur dioxide gas.
3. It helps in removing volatile impurities and converts the ore into a more convenient form for further extraction.
4. For example, zinc sulphide (ZnS) is roasted to form zinc oxide (ZnO).
5. Roasting is typically done at high temperatures and is important for preparing ores for smelting or reduction processes.