表面活性剂对神东低阶煤润湿改性机理研究  

A study of the modification mechanism of surfactant in wetting the low-rank coal of Shendong Coal Mine

作　　者：胡善沛 马椽栋 李志昊 由晓芳[2] 李琳[2] HU Shanpei;MA Chuandong;LI Zhihao;YOU Xiaofang;LI Lin(School of Safety&Environment Engineering,Shandong University of Science&Technology,Qingdao 266590,China;School of Chemistry&Biology Engineering,Shandong University of Scince&Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学安全与环境工程学院,山东青岛266590 [2]山东科技大学化学与生物工程学院,山东青岛266590

出　　处：《选煤技术》2021年第1期56-63,共8页Coal Preparation Technology

基　　金：国家自然科学基金资助项目(51904174、52074175);山东省青年科技创新计划(2020KJD001);山东省重点研究开发项目(2019GGX103035);西部煤炭绿色安全开发国家重点实验室开放基金(SKLCRKF20-05)。

摘　　要：为了探究表面活性剂对神东低阶煤的润湿改性机理,选取三种不同类型的表面活性剂,采用润湿改性试验、接触角试验、Zeta电位试验、FTIR分析和分子动力学模拟的方法,对表面活性剂的润湿改性机理进行了研究。试验结果表明:非离子型表面活性剂(曲拉通X-100)对于煤的润湿改性能力最强,其次是阴离子型表面活性剂(十二烷基苯磺酸钠),阳离子型表面活性剂(十六烷基三甲基氯化铵)对于煤的润湿改性能力最弱;Zeta电位试验表明,阳离子和阴离子表面活性剂均能大幅度改变煤表面电性,非离子表面活性剂对于煤表面电性影响较小;FTIR分析表明,表面活性剂分子通过吸附实现了对煤表面的润湿改性;分子动力学模拟研究表明,三种表面活性剂与煤的相互作用能均为负值,绝对值大小依次为非离子型表面活性剂>阴离子型表面活性剂〉阳离子型表面活性剂,说明非离子型表面活性剂与煤的吸附更为稳定。另外,非离子型表面活性剂-煤-水体系中的水分子自扩散系数最高,表明其对煤表面的润湿改性能力最强,这与润湿改性试验结果一致。In order to explore the modification mechanism of surfactants in wetting the low-rank coal of Shendong Coal Mine,a study is made of the wetting modification mechanism by making contact angle and Zeta-potential tests,FTIR analysis and molecular kinetic simulation with the use of three different surface active agents.Test result indicates that in terms of effects,the aniomic surfactant Triton X-100 is ranked first,followed by anionic surfactant sodium dodecyl benzene sulfonate(SDBS)with the cationic palmityl trimethyl ammonium chloride coming last.Zeta-potential test shows both anionic and cationic surfactants can all make significant change of surface electrical property of coal particles while the nonionic surfactant can produce only a minor influence in this respect.It is revealed by Zeta-potential analysis that the modification of surface wetting of coal particles is effected by adsorption of moleculars of surfactant on surface of coal particles.It is noted through molecular kinetic simulation that interaction of each of the 3 kinds of surfactants with coal particles assumes a negative value with the magnitude of the absolute value following the order of nonionic surfactant>anionic surfactant>cationic surfactant,indicating that the adsorption of nonionic surfactant on coal particle surface is far more stable.Furthermore,the use of the nonionic surfactant can enable the water moleculars to have a highest self-diffusion coefficient in coal-water system,signifying the nonionic surfactant exhibits a best wetting modification effect.This is in good agreement with the result obtained through the test.

关 键 词：低阶煤 润湿改性 表面活性剂 接触角 沉降时间 Zeta电位 吸附构型 

分 类 号：TD943[矿业工程—选矿]