Synergistic effect of mixed DDA/surfactants collectors on flotation of quartz
Synergistic effect of mixed DDA/surfactants collectors on flotation of quartz
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DDA/表面活性剂混合捕收剂对石英浮选的协同作用
DOI：
10.1016/j.mineng.2020.106605
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发表时间：
2020-12-01
影响因子：
4.8
通讯作者：
Fan, Min-Qiang
中科院分区：
文献类型：
--
作者：
Liu, An;Fan, Pan-Pan;Fan, Min-Qiang
本文研究了五类表面活性剂，包括非离子亲油表面活性剂Span系列表面活性剂、非离子亲水表面活性剂Tween和OP系列表面活性剂、兼具阴离子和亲水性的表面活性剂NaOL和油酸三乙醇胺（简称OL系列），阳离子和亲水表面活性剂AC 1201和AC 1205的特性（简称AC系列）为研究对象，考察了表面活性剂的结构与协同作用的关系，重点研究了典型的阳离子捕收剂十二胺（DDA）和表面活性剂混合物在液/气和固/液体界面的结构，以探讨应用潜力，在开发一种有效的表面活性剂，适用于石英浮选。采用浮选实验、表面张力测定、微量热实验、相互作用参数计算和傅里叶变换红外光谱（FTIR）分析等方法，研究了不同DDA/表面活性剂体系的特性以及石英与捕收剂混合物的相互作用机理。结果表明，各表面活性剂的协同作用大小为：AC > OP > Tween > Span > OL。AC 1201与其他表面活性剂相比具有更强的协同增效作用，与纯DDA相比，回收率提高了20%以上。根据规则溶液理论，对表面活性参数、胶束和界面组成以及相互作用参数等物理化学性质进行了评价。表面活性剂的加入降低了混合溶液的表面张力和临界胶束浓度。根据Rubingh基本方程，这些表面活性剂的相互作用参数大小顺序为：OL > Span > OP > Tween > AC，表明石英的浮选回收率与相互作用参数呈负相关。微量热法测得的相互作用热变化与浮选实验的趋势呈正相关。实验结果表明，应选用能强化捕收剂在固/液界面吸附的表面活性剂。AC 1201在石英浮选中具有工业应用潜力。
In this study, five types of surfactants including non-ionic lipophilic surfactant Span series surfactant, non-ionic hydrophilic surfactant Tween and OP series surfactant, characteristics of both anionic and hydrophilic surfactant NaOL and triethanolamine oleate (named as OL series for short), characteristics of both cationic and hydrophilic surfactant AC1201 and AC1205 (named as AC series for short) were chosen as research subjects to investigate the relationship between the structure and synergistic ability of surfactants, focusing on the adsorption of the typical cationic collector dodecylamine (DDA) and surfactant mixture at liquid/air and solid/liquid interface to investigate the application potential of structure in the development of an effective surfactant to apply for quartz flotation. Flotation experiments, surface tension measurements, microcalorimetric experiments, interaction parameter calculation and Fourier Transform Infrared Spectroscopy (FTIR) analysis were used to analyze the characteristics of different DDA/surfactant systems and the interaction mechanism between quartz and collector mixture. The flotation results indicated that the synergistic capacity of these surfactants was in the following ranking: AC > OP > Tween > Span > OL. AC1201 showed a stronger synergistic ability than the other surfactants, accompanying with a recovery promotion over 20% compared with pure DDA. The physicochemical properties including surface activity parameters, the micelles and interfacial compositions, and interaction parameters were evaluated according to the theory of regular solutions. The surface tension and critical micelle concentration of the mixture solution decreased with the addition of the surfactant. According to the basic Rubingh equations, the interaction parameter of these surfactants was in the following ranking: OL > Span > OP > Tween > AC, indicating that the flotation recovery of quartz was negatively correlated with the interaction parameters. While there was a positive correlation between the interaction heat changes obtained from microcalorimetry and the trend from the flotation experiments. The obtained results demonstrated that it should be chosen this type of surfactant, which can be able to intensify collector adsorption at the solid/liquid interface. AC1201 has a potential for industrial application in the flotation of quartz.