Interfacial interaction mechanism between alkali metal ions and cationic/anionic surfactants and insight into low-rank coal flotation

IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Advanced Powder Technology Pub Date : 2024-09-16 DOI:10.1016/j.apt.2024.104640
Rensheng Li , Zijuan Xie , You Zhou , Wanlin Wang , Xiahui Gui
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Abstract

In the low-rank coal flotation process, the modification and adhesion behavior of particles can be reflected by the interaction of the phase interface. Therefore, the interfacial mechanism of alkali metal ions (K+, Na+) in gas-surfactant solution (DTAC, SDS) and the coal-liquid interfaces were investigated by dynamic surface tension and contact angle measurements. The results showed that the salt ions can affect the adsorption kinetic behavior of surfactants at the gas–liquid interface as well as the wetting performance of the solution on coal. Besides, through the interfacial energy and wetting work could judge the tendency of the reactivity and flotability of a solution. In this case, the adsorption experiments, SEM, XPS, probe method and hydrophilicity test were further carried out to verify the surface information of the modified coal. The results illustrated that the DTAC molecule absorbed on coal is realized by the N+–OH ionic bond, which is firstly proved in the coals modification; while the SDS molecule can be absorbed by O–HO hydrogen bond, which were also proved by the surface free energy analysis. Moreover, the flotability performance of modified coal on the residue solution showed the DTAC could increase the hydrophobicity of the coal, while the SDS-modified coal should be paid attention to the occurrence of hydrophobic tail adsorption.

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碱金属离子与阳离子/阴离子表面活性剂的界面相互作用机理及对低阶煤浮选的启示
在低阶煤浮选过程中,颗粒的改性和粘附行为可以通过相界面的相互作用反映出来。因此,通过动态表面张力和接触角测量,研究了气体-表面活性剂溶液(DTAC、SDS)中碱金属离子(K+、Na+)与煤液界面的相互作用机理。结果表明,盐离子会影响表面活性剂在气液界面的吸附动力学行为以及溶液对煤的润湿性能。此外,通过界面能和润湿功可以判断溶液的反应性和可浮性趋势。在此基础上,进一步进行了吸附实验、扫描电镜、XPS、探针法和亲水性测试,以验证改性煤的表面信息。结果表明,煤上吸附的 DTAC 分子是通过 N+-OH- 离子键实现的,这在煤的改性中首次得到证实;而 SDS 分子则可以通过 O-HO 氢键吸附,这也得到了表面自由能分析的证实。此外,改性煤在残渣溶液上的可浮性表明,DTAC 可以增加煤的疏水性,而 SDS 改性煤则应注意疏水尾吸附的发生。
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来源期刊
Advanced Powder Technology
Advanced Powder Technology 工程技术-工程:化工
CiteScore
9.50
自引率
7.70%
发文量
424
审稿时长
55 days
期刊介绍: The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide. The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them. Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)
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