【摘要】 为了改善细粒辉钼矿的浮选效果，研究了正十二硫醇（NDM）作为辅助捕收剂与煤油复配对细粒辉钼矿浮选行为的影响及作用机理.单矿物浮选试验结果表明：NDM与煤油复配（质量比2∶3）显著强化了辉钼矿的浮选效果.实际矿石浮选试验表明：复配捕收剂具有较好的捕收能力.接触角测试表明NDM与煤油复配有效改善了细粒辉钼矿表面的疏水性，红外光谱（FTIR）及X射线光电子能谱（XPS）分析证实了NDM大量吸附于细粒辉钼矿表面.密度泛函理论（DFT）计算表明NDM通过巯基（—SH）上的S 3p轨道与Mo 4d轨道杂化，在辉钼矿极性“棱”上完成吸附，NDM在001面的吸附能(E_ads=505.536 kJ/mol)远高于在100面的吸附能，而煤油更易于吸附在001面上.因此，NDM和煤油在辉钼矿不同晶面的差异化吸附，同时改善了辉钼矿“棱面”疏水性，协同强化了细粒辉钼矿的浮选回收.更多还原

【Abstract】 In order to improve the flotation effect of molybdenite fines, the effect and mechanism of n-dodecanethiol（NDM） as an auxiliary collector compounded with kerosene on the flotation behavior of molybdenite fines were investigated. The results of single flotation tests show that the combination of NDM and kerosene（2∶3） significantly enhances the flotation effect of molybdenite. The actual ore flotation tests show that the compound collector has a better collection ability. The contact angle tests show that the combination of NDM and kerosene effectively improves the hydrophobicity of molybdenite fines, and FTIR and XPS analysis confirms that NDM adsorbs on the surface of molybdenite fines. DFT calculations show that NDM adsorbs on the polar "edges" of molybdenite by hybridization of the S 3p orbitals on the sulfhydryl group（—SH） with the Mo 4d orbitals, and that the adsorption energy of NDM on the 001 surfaces(E_ads=505.536 kJ/mol) is much higher than that on the 100 surfaces, while kerosene is more easily adsorbed on the 001 surfaces. Therefore, the differential adsorption of NDM and kerosene on the different crystalline surfaces of molybdenite improves the hydrophobicity of molybdenite’s "edges" and synergistically enhances the flotation recovery of molybdenite fines.更多还原