Name the method used for the refining of Nickel metal.

Explanation

### Step-by-Step Solution:

1. **Understanding the Concept of Refining**:
- Refining is the process of converting impure metal obtained from ores into pure metal. This is essential for obtaining metals that can be used in various applications.

2. **Identifying the Method for Nickel Refining**:
- The specific method used for refining nickel is known as **vapor phase refining**.

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