关键词: 磁黄铁矿, 氧化, 超声波, 浮选, 溶解, 表面性质

Abstract: In order to investigate the flotation mechanism of the oxidized pyrrhotite treated by ultrasonic， the surface property， surface dissolution and the flotation behavior of oxidized pyrrhotite were investigated through flotation experiments， ultrasonic dissolution experiments， X-ray photoelectron spectroscopy， Zeta potential measurements and collector adsorption testing. The results show that ultrasonic can promote the dissolution of the oxides. Treated by ultrasonic， iron oxides such as FeOOH， Fe2（SO4）3 are dissolved， making the surface rich in sulfur as well as small part of fresh pyrrhotite surface exposed. Further ultrasonic treatment won't change the surface property. After treated by ultrasonic， the point of Zero charge shift towards the negative direction. The pyrrhotite become more hydrophobic， making the collector more easily adsorb on its surface and promoting the flotation behavior of pyrrhotite. There is no bad effect even treated by excessive ultrasonic. The results may provide additional insights into the flotation improvement of the oxidized sulfide minerals by ultrasonic.

Key words: Pyrrhotite, Oxidization, Ultrasonic, Flotation, Dissolution, Surface property