Which of the following is not a refining process?

Options

A. Electrolysis
B. Smelting
C. Poling
D. Liquation

Explanation

To determine which of the following options is not a refining process, we need to analyze each option in the context of what refining entails. Refining is the process of purifying crude metals, which are typically impure.

### Step-by-Step Solution:

1. **Understand Refining**:
- Refining is the process of purifying a crude metal. A crude metal is one that contains impurities.

2. **Analyze Each Option**:
- **Option A: Electrolysing**:
- This is a refining process where impure metals are purified using electricity. Therefore, this is a refining process.

- **Option B: Smelting**:
- Smelting is the process of extracting metal from its ore by heating and melting. This process is primarily for extraction rather than purification. Thus, smelting is not a refining process.

- **Option C: Poling**:
- Poling is a refining process used to purify metals that contain oxidized impurities. This is a method of refining.

- **Option D: Liquation**:
- Liquation is a method of separating components of an ore or alloy by partial melting. This is also a refining process.

3. **Conclusion**:
- After analyzing all options, it is clear that **Option B: Smelting** is not a refining process.

### Final Answer:
**Smelting (Option B) is not a refining process.**