Flotation Collectors

Flotation collectors are surface-active reagents that make a target mineralnhydrophobic so it attaches to air bubbles and reports to the froth in a flotationncell. Collector choice is set by mineralogy: thiol collectors such as xanthatesnwork on sulfides, while fatty acids work on oxide and salt-type minerals. Match thencollector chemistry to the ore before tuning dose, because the wrong family will notnattach no matter how much you add.

Potassium amyl xanthate (PAX) and sodium isobutyl xanthate (SIBX) are the standardnsulfide collectors. PAX has the longer hydrocarbon chain, so it is the stronger but lessnselective collector; SIBX is shorter-chain and more selective. That is the workingntrade-off: recovery versus grade. Use a more selective collector when separating closelynassociated sulfides, and a stronger one when maximum recovery outweighs concentratengrade.

Oleic acid is the common fatty-acid collector for non-sulfide minerals such asnfluorite, hematite, phosphate, and some carbonates. It is dosed as the free acid or as ansoap, and performance is sensitive to pulp pH and water hardness. Xanthates carrynhandling considerations: they are flammable, have a strong characteristic odor, andndecompose under heat, acid, or moisture to release carbon disulfide. Store them cool,ndry, and sealed, and confirm handling and regulatory status for your jurisdiction.

• Sulfide flotation of copper, lead, zinc, and molybdenum ores (xanthate collectors)
• Selective separation of closely associated sulfide minerals (shorter-chain xanthates)
• Oxide and salt-type mineral flotation: fluorite, phosphate, iron oxides (fatty-acid collectors)
• Bulk-then-differential flotation circuits where recovery and grade are staged
• Collector blending to balance mineral recovery against concentrate grade

• Potassium amyl xanthate u2014 PubChem
• Sodium isobutyl xanthate u2014 PubChem
• Oleic acid u2014 PubChem