Hydrometallurgy.

Explanation

### Step-by-Step Text Solution for Hydrometallurgy

1. **Definition of Hydrometallurgy**:
- Hydrometallurgy is a branch of extractive metallurgy that involves the use of aqueous solutions to extract metals from their ores or salts.

2. **Process Overview**:
- The process involves the dissolution of metal salts in a liquid solution, typically water, which allows for the metal to be extracted.

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