Microscopic spreading characteristics of non-polar oil droplet on low rank coal surface: Effects of surfactant pretreatment and oxygen-containing groups
Microscopic spreading characteristics of non-polar oil droplet on low rank coal surface: Effects of surfactant pretreatment and oxygen-containing groups
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非极性油滴在低阶煤表面的微观铺展特性：表面活性剂预处理和含氧基团的影响
DOI：
10.1016/j.molliq.2020.115232
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发表时间：
2021-03
影响因子：
6
通讯作者：
Liu Shengyu
中科院分区：
文献类型：
--
作者：
Zhang Lei;Guo Jianying;Hao Meng;Li Bao;Liu Shengyu
低阶煤表面存在大量的含氧基团，使得普通捕收剂对低阶煤的浮选效果不佳。提高捕收剂在LRC表面的扩散强度对改善其浮选性能具有重要意义。本研究采用分子动力学模拟（MDS）研究了非极性油滴在LRC表面的微观扩散特征。为此，计算了非极性油滴的构型、扩散面积和相互作用能。结果表明，在LRC原料表面，非极性油滴呈球形，扩散面积小，相互作用强度弱。此外，采用非离子表面活性剂十二烷基壬乙氧基醚（C12EO9）对LRC的表面润湿性进行了改性，增强了非极性油滴的扩散。表面活性剂预处理后，LRC表面形成了一层饼状油膜，与未处理的LRC表面相比，其扩散面积更大，负相互作用能更高。在此基础上，对非极性油滴在LRC表面的扩散过程以及表面活性剂增强其扩散强度的作用提供了微观认识。此外，还探讨了含氧基团对非极性油滴扩散行为的影响。结果表明，羧基和羟基是阻碍非极性油滴在LRC表面扩散的主要基团。仿真结果与现有实验数据吻合较好。
Numerous oxygen-containing groups present on the low rank coal (LRC) surface makes a poor flotation performance of LRC only using common oily collector. Increasing the spreading strength of oily collector on the LRC surface is of great significance for improving its flotation behavior. In this study, molecular dynamics simulation (MDS) was employed to investigate the microscopic spreading characteristics of non-polar oil droplet on the LRC surface. For this purpose, the configurations of non-polar oil droplet, spreading area, and interaction energy were calculated. It was found that on the raw LRC surface, the non-polar oil droplet remained spherical with a small spreading area and weak interaction strength. Besides, a non-ionic surfactant, dodecyl nonaethoxyl ether (C12EO9) was used to modify the surface wettability of LRC to enhance the non-polar oil droplet spreading. After surfactant pretreatment, a pancake-like oil film was formed on the LRC surface with a larger spreading area and more negative interaction energy compared with the case of the raw LRC surface. Based on these observations, the microscopic insights were provided about the spreading of non-polar oil droplet on the surface of LRC, as well as the role of surfactant enhancing its spreading intensity. In addition, the effect of the oxygen-containing groups on the spreading behaviors of non-polar oil droplet was also explored. The results suggested that carboxyl and hydroxyl are the main groups that hinder the spreading of the non-polar oil droplet on LRC surface. The simulation results are in accordance with the available experimental data.
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水溶性矿物浮选的一些物理化学方面
影响因子：
15.6
作者：
Wu Zhijian;Wang Xuming;Liu Haining;Zhang Huifang;Miller Jan D.
通讯作者：
Miller Jan D.
DOI：
10.1007/bf03403042
发表时间：
1994-02
期刊：
Mining, Metallurgy & Exploration
影响因子：
--
作者：
S. Chander;H. Polat;B. Mohal
通讯作者：
S. Chander;H. Polat;B. Mohal
影响因子：
5.2
作者：
Yingwei Wang;Yijun Cao;Guosheng Li;Yinfei Liao;Yaowen Xing;X. Gui
通讯作者：
Yingwei Wang;Yijun Cao;Guosheng Li;Yinfei Liao;Yaowen Xing;X. Gui
影响因子：
5.2
作者：
Cheng, Gan;Li, Ziyou;Jiang, Zhendong
通讯作者：
Jiang, Zhendong
混合捕收剂强化低阶煤浮选实验及分子动力学模拟研究
影响因子：
7.4
作者：
Zhang, Lei;Sun, Xiaole;Liu, Shengyu
通讯作者：
Liu, Shengyu