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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第10期    总第290期    2018年10月

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文章编号:1672-7207(2018)10-2365-08
煤泥水水质对仲辛醇乳液稳定性的影响
崔浩然,朱书全,陈慧昀,徐东方

(中国矿业大学(北京) 化学与环境工程学院,北京,100083)

摘 要: 为探究煤泥水水质对仲辛醇乳液稳定性的影响,采用酸碱和电解质调节乳液环境的方法,通过测定乳液样品的乳化性能综合指数(S)、平均粒径和ζ电位,研究pH和电解质(NaCl,CaCl2和AlCl3)对乳液稳定性的影响,并利用经典DLVO理论揭示pH和电解质对乳液稳定性的影响机理。研究结果表明:当pH由4增加到11时,乳液体系位能曲线势垒不断增大,油滴间静电斥力亦随之增大而不易聚并,乳液粒径减小,稳定性增强,分散性变好,当pH由11增大到12时与上述规律相反;随电解质浓度及阳离子价态的升高,乳液位能曲线势垒降低,油滴间静电斥力减小导致聚并,乳液粒径增大,稳定性降低,分散性变差;弱碱性的煤泥水有利于乳液稳定,但其含有的电解质不利于乳液稳定,总体上导致乳液稳定性降低,在矿浆中分散性变差。

 

关键字: 乳液;稳定性;分散性;pH;电解质离子

Effect of slime water quality on stability of octanol emulsion
CUI Haoran, ZHU Shuquan, CHEN Huiyun, XU Dongfang

School of Chemical & Environmental Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China

Abstract:In order to investigate the effect of slime water quality on the stability of octanol emulsion, the emulsification performance index(S), average particle size and zeta potential of emulsion samples were determined by acid-base and electrolyte. The effect of pH value and electrolyte (NaCl, CaCl2, AlCl3) on the stability of the emulsion was studied, and the influencing mechanism was revealed by the classical DLVO theory. The results show that both the potential energy barrier of the emulsion system and the electrostatic repulsion of the oil droplets increase with the increase of pH from 4 to 11, leading to the decrease in the particle size of the emulsion. Consequently, the stability of emulsion increases, and the dispersibility becomes better. When pH continuously increases from 11 to 12, the performance of emulsion is opposite to the law mentioned above. With the increase of concentration and electrolyte valence, the potential barrier curve of the emulsion and the electrostatic repulsion significantly decrease. The stability and dispersibility of emulsion reduce due to the increasing particle size of emulsion. Weak alkaline slime water is beneficial for the stability of the emulsion. However, the electrolyte contained in slime water is bad for emulsion stability, overall resulting in the decrease of emulsion stability and dispersion in the pulp.

 

Key words: emulsion; stability; dispersion; pH; electrolyte ion

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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