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Describe flotation separation as a method of ore dressing. - Leaving Cert Engineering - Question b - 2010
Question b
Describe flotation separation as a method of ore dressing.
Worked Solution & Example Answer:Describe flotation separation as a method of ore dressing. - Leaving Cert Engineering - Question b - 2010
Step 1
Flotation Separation Overview
Answer
Flotation separation is a process used in ore dressing to separate fine particles of ore based on their surface properties. This method is particularly effective for separating materials with different hydrophobicity.
In this method, fine particles of ore are introduced into a large flotation tank where they are agitated with air bubbles and flotation agents.
Step 2
Process of Flotation
Answer
- Mixing: The fine ore particles are swirled in a tank filled with water. Air is blown into the tank, creating bubbles.
- Addition of Flotation Agents: Chemicals known as flotation agents are added to the water. These agents help to increase the hydrophobic nature of the targeted minerals.
- Attachment to Bubbles: The ore particles attach to the air bubbles. This happens due to the difference in surface tension, as hydrophobic particles readily bind to the bubbles while hydrophilic particles do not.
- Separation: The bubbles rise to the surface of the tank, carrying the attached ore particles with them. A froth is formed at the surface, which can then be skimmed off, effectively separating the valuable minerals from the waste material that sinks to the bottom.