What is the role of depressant in froth floatation process ? Give an example.

Explanation

### Step-by-Step Solution:

1. **Understanding Froth Flotation Process**:
- The froth flotation process is a method used for separating hydrophobic materials from hydrophilic materials. It is commonly used in the mining industry to extract metals from ores.

2. **Role of Depressant**:
- A depressant is a substance that is added to the flotation process to selectively prevent certain minerals from floating while allowing others to do so. This is crucial for the separation of different minerals based on their surface properties.

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