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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.