摘要
The effects of combined microwave and hydrogen peroxide(H_(2)O_(2))oxidation on the flotation separation of molybdenite and chalcopyrite,as well as the underlying mechanism were investigated via microflotation,zeta potential,contact angle,X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM)and atomic force microscopy(AFM)analyses.The microflotation experiments showed that the effective inhibition of chalcopyrite can be obtained through combined oxidation pretreatments with low microwave power and H_(2)O_(2)consumption.The zeta potential,contact angle and XPS analyses indicated that the surface hydrophobicity of molybdenite changed minimally after different treatments,whereas significant amounts of hydrophilic oxidation species were formed on the surface of chalcopyrite,thus decreasing its surface hydrophobicity and floatability.Moreover,the SEM and AFM analyses indicated that more uniform oxidative products were formed on the chalcopyrite surface,further significantly increasing the surface roughness.
通过浮选试验、Zeta电位、接触角、X射线光电子能谱(XPS)、扫描电镜(SEM)和原子力显微镜(AFM)分析,全面研究微波与双氧水(H2O2)组合氧化预处理对辉钼矿和黄铜矿浮选分离的影响及其作用机理。浮选试验结果表明,在较低的微波功率和H2O2用量条件下,采用组合氧化预处理可实现黄铜矿的有效抑制。Zeta电位、接触角和XPS分析表明,不同条件下预处理的辉钼矿表面疏水性变化不大,而黄铜矿表面形成了大量亲水性氧化组分,从而降低了黄铜矿的表面疏水性和可浮性。此外,SEM和AFM分析表明,黄铜矿表面形成了更均匀的氧化产物,进一步使其表面粗糙度明显增加。
基金
support by the National Natural Science Foundation of China(Nos.52104266,52074206,52374278)
Key Research and Development Project of Shaanxi Province,China(No.2023GXLH-054).
