超声波强化氧化磁黄铁矿浮选的机理研究

为探讨超声波强化氧化后磁黄铁矿浮选的机理，通过单矿物浮选试验、超声波溶解试验、X光电子能谱表面检测分析、动电位测定和捕收剂在磁黄铁矿表面的吸附量检测，研究了超声波对被氧化后磁黄铁矿表面溶解、表面性质及可浮性的影响，并对其机理进行分析。结果表明：超声波能促进磁黄铁矿表面氧化物的溶解，超声波作用后磁黄铁矿表面富铁贫硫氧化层中FeOOH、Fe₂（SO₄）3溶解，暴露出富硫贫铁表面及部分新鲜磁黄铁矿表面，进一步超声处理不会改变磁黄铁矿表面性质；超声波作用后磁黄铁矿零电点负移，疏水性增强，提高了被捕收剂吸附的概率；超声波能改善磁黄铁矿浮选指标，且过度超声不会对浮选产生不利影响。试验结果对超声强化表面被氧化的硫化矿浮选具有重要的指导意义。

Research on the Mechanism of the Oxidized Pyrrhotite Flotation Improvement by Ultrasonic

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.