Explain the principle of the method electrolytic refining of metal. Given one example.

Explanation

### Step-by-Step Solution:

1. **Understanding Electrolytic Refining**:
- Electrolytic refining is a technique used to purify impure metals through the process of electrolysis. It involves the use of an electric current to drive a chemical reaction that separates the pure metal from its impurities.

2. **Setup of the Electrolytic Cell**:
- In this method, the impure metal is used as the anode (positive electrode), while a pure metal strip serves as the cathode (negative electrode).

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