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How does hydrometallurgy use aqueous solutions to extract metals?
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metallurgy
A zinc-lead blast furnace and lead-splash condenser. This technology is utilized mainly for producing zinc while managing both lead and zinc from raw materials, a technique that was highly influential in 20th-century smelting.
Hydrometallurgy is a process used to extract metal from ore by creating an aqueous solution of a metal salt and subsequently recovering the metal from that liquid.1
The process generally involves three primary stages:
- Leaching: The metal or its compound is dissolved in water, often with the help of chemical agents such as dilute sulfuric acid. This step is particularly useful for low-grade ores where other extraction methods are too costly.21
- Separation and Purification: Once the metal is in solution, waste materials are separated, and the leach solution is purified.1
- Recovery: The final metal or a pure compound is precipitated from the solution using chemical or electrolytic methods.1
Modern techniques like ion exchange and solvent extraction have expanded the utility of hydrometallurgy, allowing it to be used for the production of more than 70 metallic elements, including gold, silver, copper, and zinc.1