What is the role of flux in metallurgical processes?

Explanation

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

1. **Definition of Flux**: Flux is a substance that is added during metallurgical processes to facilitate the removal of impurities, known as gangue, from the ore.

2. **Role in Removing Gangue**: The primary role of flux is to combine with the gangue to form a molten material called slag. This process helps in separating the valuable metal from the unwanted impurities.

3. **Types of Flux**: There are two main types of flux based on their chemical nature:
- **Basic Flux**: An example is calcium oxide (CaO), which is used to combine with acidic gangue.
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