相同链长伯铵盐和季铵盐对云母表面润湿性的影响

发布时间：2018-04-27 04:13

本文选题：十二胺(DDA) + 十二烷基三甲基溴化铵(DTAB)　；参考：《有色金属(选矿部分)》2017年04期

【摘要】：胺类捕收剂通过吸附在云母表面而改变其亲水性,从而达到浮选的目的。当溶液浓度由1.00×10~(-5)mol/L增加到2.04×10~(-4)mol/L,捕收剂为十二胺时白云母表面接触角由46.71°增大到78.77°,而捕收剂为十二烷基三甲基溴化铵时的白云母表面接触角由25.79°增大到65.31°,说明相同浓度条件下十二胺能更好地改变白云母表面的亲水性,使之具有疏水性。原子力显微镜观察白云母表面捕收剂吸附图也表明,捕收剂浓度为2.04×10~(-4)mol/L,相比十二烷基三甲基溴化铵,白云母表面能吸附更多的十二铵离子。应用Materials Studio 6.1软件,采用PCFF_phyllosilicates分子力场,模拟研究白云母表面的水化作用的变化。结果表明因为伯铵盐能更稳定地吸附在白云母表面,其改善白云母表面亲水性的能力强于季铵盐。从理论和实践上解释了伯铵盐能更好地改变白云母表面的亲水性,使其具有一定的疏水性,从而达到浮选的目的。
[Abstract]:Amines change their hydrophilicity by adsorbing on the surface of mica to achieve the purpose of flotation. The surface contact angle of Muscovite increased from 46.71 掳to 78.77 掳when the concentration of solution was increased from 1.00 脳 10~(-5)mol/L to 2.04 脳 10 ~ (-4) mol / L, and the contact angle of Muscovite surface was increased from 25.79 掳to 65.31 掳when the collector was dodecyl trimethylammonium bromide, indicating the same concentration. Dodecylamine can change the hydrophilicity of Muscovite surface better. Make it hydrophobic. Atomic force microscopy (AFM) observation also showed that the collector concentration was 2.04 脳 10 ~ (-1) -4 渭 mol / L, and more dodecylammonium ions could be adsorbed on the surface of Muscovite than dodecyl trimethylammonium bromide. The changes of hydration on Muscovite surface were simulated by using Materials Studio 6.1 software and PCFF_phyllosilicates molecular force field. The results show that the primary ammonium salt is more stable to adsorb on the surface of Muscovite, and its ability to improve the hydrophilicity of Muscovite surface is stronger than that of quaternary ammonium salt. It is explained theoretically and practically that primary ammonium salt can change the hydrophilicity of Muscovite surface better and make it hydrophobic so as to achieve the purpose of flotation.
【作者单位】：华东理工大学化学工程联合国家重点实验室;江西科技师范大学化学化工学院;南昌大学化学学院;
【基金】：国家自然科学基金资助(51564011)
【分类号】：TD923.14;TD97

【参考文献】