Froth flotation is the primary method used to separate valuable minerals from gangue in mining. Selectivity depends on the delicate chemical balance between collectors, frothers, and modifiers. At Craitin, we design custom flotation packages tailored to specific mineral structures.
Hydrophobicity and Mineral Selectivity
Most mineral surfaces are naturally hydrophilic (water-attracting). Collectors are organic compounds that selectively adsorb onto target mineral surfaces, rendering them hydrophobic (water-repelling). This allows air bubbles to attach to the mineral and float them to the surface.
“Modulating collector chemistry in polymetallic ores allows the selective recovery of copper and gold while leaving iron sulphides in the tailings.”
Types of Flotation Modifiers
- Activators: Enhance collector adsorption on minerals that are normally difficult to float.
- Depressants: Selectively render gangue minerals hydrophilic, preventing them from floating.
- pH Regulators: Control slurry pH, which dictates the ionization state of collectors.
