正十二硫醇与煤油协同强化细粒辉钼矿浮选机理研究  

Study on the flotation mechanism of molybdenite fines by synergistic enhancement of n-dodecanethiol and kerosene

作　　者：马子龙[1] 潘文峰 李树磊[1] 高丽慧[3] 曹亦俊[1,4] 李玲妮 都世杰 MA Zilong;PAN Wenfeng;LI Shulei;GAO Lihui;CAO Yijun;LI Lingni;DU Shijie(National Engineering Research Center of Coal Preparation and Purification,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;School of Chemical Engineering,Zhengzhou University,Zhengzhou,Henan 450001l,China;School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan,Hubei 430070,China)

机构地区：[1]中国矿业大学国家煤加工与洁净化工程技术研究中心,江苏徐州221116 [2]中国矿业大学化工学院,江苏徐州221116 [3]中国矿业大学环境与测绘学院,江苏徐州221116 [4]郑州大学化工学院,河南郑州450001 [5]武汉理工大学资源与环境工程学院,湖北武汉430070

出　　处：《中国矿业大学学报》2023年第6期1231-1240,共10页Journal of China University of Mining & Technology

基　　金：中国博士后科学基金面上项目(2019M652025);国家自然科学基金面上项目(51574240);国家自然科学青年基金项目(51904299)。

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(Eads=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.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.

关 键 词：辉钼矿 正十二硫醇 DFT计算 浮选 

分 类 号：TD952[矿业工程—选矿]