What is meant by the term ' pyrometallurgy' ?

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Pyrometallurgy**: The term 'pyrometallurgy' refers to a branch of metallurgy that involves the extraction and purification of metals through the application of heat.

2. **Breakdown of the Term**: The prefix 'pyro' means heat, and 'metallurgy' refers to the science of extracting metals from their ores. Thus, pyrometallurgy can be understood as the extraction of metals using heat.

3. **Processes Involved**: Pyrometallurgy encompasses several processes, including:
- **Roasting**: Heating the ore in the presence of oxygen to convert it into an oxide or other compound.
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