Introduction to Flotation
Froth flotation is one of the most important concentration processes used in mineral processing. It selectively separates hydrophobic (water-repelling) particles from hydrophilic (water-attracting) particles by attaching them to air bubbles rising through a water slurry.
Basic Flotation Chemistry
Collectors:
- Xanthates: Most common collectors for sulfide minerals
- Thionocarbamates: Selective for chalcopyrite
- Dithiophosphates: Used for secondary copper minerals
- Fatty acids: Used for oxide minerals
Frothers:
- Create stable air bubbles in the flotation cell
- Control bubble size and froth stability
- Common frothers: MIBC, pine oil, alcohols
Modifiers:
- pH modifiers: Lime (pH increase), sulfuric acid (pH decrease)
- Depressants: Sodium cyanide, zinc sulfate
- Activators: Copper sulfate for sphalerite
Froth Flotation — Mineral Separation Principle
Flotation Cell Components
- Impeller: Mixes slurry with air and disperses bubbles
- Stator: Stabilizes pulp flow and directs air flow
- Launder: Collects the concentrate-laden froth
- Conditioner: Provides residence time for reagent adsorption
Key Operating Parameters
- Air flow rate: Affects bubble size and recovery
- Pulp level: Controls residence time and entrainment
- Impeller speed: Affects bubble-particle collision
- Reagent dosage: Must be optimized for ore characteristics
WSHT provides flotation equipment and process optimization support for copper, lead, zinc, nickel and other sulfide mineral applications.
