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Froth stability plays an important role in determining the concentrate quality and recovery in a froth flotation process.A specially designed flotation column was integrated with a nanobubble generator to investigate the impact of nanobubbles on froth stability and their effects on phosphate flotation performance.The results indicated that nanobubbles and particles of a contact angle up to 70 degrees significantly enhanced the froth stability.More importantly it was demonstrated,for the first time,that froth stability was well maintained by nanobubbles in the presence of strongly hydrophobic particles with a contact angle of more than 85 degrees.Flotation tests with 0.425 mm-1.18 mm phosphate particles showed nanobubbles reduced the frother and collector dosage by one third to one half and significantly improved flotation kinetics.Nanobubbles also increased the P2O5 recovery by 7%to 25%,depending on particle size and concentrate grade.