What is the role of cryolite in the metallurgy of aluminium?

Explanation

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

1. **Understanding the Context**: In the metallurgy of aluminum, aluminum is extracted from its ore, alumina (Al₂O₃). The process involves separating aluminum metal from alumina.

2. **Role of Cryolite**: Cryolite (Na₃AlF₆) plays a crucial role in this extraction process. It is primarily used to facilitate the electrolytic reduction of alumina.

3. **Melting Point of Alumina**: The melting point of alumina is very high, approximately 2323 K. This high melting point makes the extraction process difficult and energy-intensive.

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