Abstract: The fluorinated apatite ore from Lianyungang contains 31.23% P2O5， and its gangue minerals are mainly dolomite， calcite and quartz， with contents of 13.68%， 6.82% and 2.33%， respectively. In order to develop and utilize the ore， the direct flotation purification experiment was carried out. Results show that at the grinding fineness of 76.80% passing 0.074 mm， NaOH as pH adjusting agent， sodium carbonate and sodium silicate as both inhibitor and dispersant， sodium oleate as collector， the flotation machine impeller speed of 2 000 r/min， inflating volume is 0.25 m³/h， via one roughing one cleaning and one scavenging flotation， apatite concentrate with P₂O₅ content of 36.68%， at recovery of 89.90% was obtained. Infrared spectrometry and surface Zeta measurement showed that sodium oleate was mainly adsorbed on the surface of apatite in the form of chemical adsorption， which reduced the surface dynamic potential of apatite. This results has significant reference for the recovery and utilization of phosphorus resources.

Key words: Apatite, Flotation, Purification, Zeta potential, Chemical adsorption