基于两性/非离子表面活性剂的纳米乳液捕收剂强化低阶煤浮选机理

doi:10.3969/j.issn.2097-2806.2025.12.005

Abstract

Abstract:

The abundant oxygen-containing functional groups and pore structures on the surface of low-rank coal （LRC） have restricted its flotation efficiency. Compared with traditional hydrocarbon oil collectors, emulsion collectors are an effective method to improve the dispersion performance and improve their adsorption and hydrophobic modification effect on LRC surface. In this work, a series of nanoemulsion collectors which were synergistically stabilized with zwitterionic and nonionic surfactants were prepared by low-energy emulsification method, using erucic acid amidopropyl betaine （EAB-40） and fatty alcohol polyoxyethylene ether （AEO-7） as surfactants, and diesel oil as oil phase. The influences of the contents of EAB-40 and AEO-7 on the droplet size and microscopic dynamic stability of nanoemulsions were systematically studied through dynamic light scattering （DLS） and multiple light scattering （MLS）. The mechanism for nanoemulsions to enhance flotation was investigated through LRC flotation tests and the measurements of particle-bubble and particle-droplet adhesion/detachment forces. The results showed that when the mass ratio of EAB-40∶AEO-7 was 1∶4 （nanoemulsion collector #1）, the droplet size of the nanoemulsion was the smallest （D₅₀=307 nm）, and the combustible matter recovery of LRC flotation could reach the maximum of 92.24%. Compared with traditional diesel collector, nanoemulsion collector #1 could significantly improve the hydrophobicity of LRC surface, enhance the adhesion/detachment interactions between coal particle and bubble and between coal particle and collector, and thus significantly improve the LRC flotation performance. The mechanism was that the EAB-40 at the surface of nanoemulsion droplets had both positively and negatively charged groups, which could both enhance the adsorption of collectors onto LRC surface and the hydrophobic modification of LRC surface through electrostatic attraction; however, when the EAB-40 content was too high, it would lead to excessive adsorption of surfactants and reduce the surface hydrophobic modification and the flotation performance to a certain extent. This research might be helpful to improve the theoretical basis and provide technical support for the development of novel collectors for LRC flotation.

Key words: low-rank coal, flotation, nanoemulsion collector, zwitterionic surfactant, non-ionic surfactant, adhesion force, detachment force

CLC Number:

TQ423

Yingying Wang, Zhenchao Ma, Zhe Li, Yibo Kong, Xinyi Zhao, Yaowen Xing, Xiahui Gui. Mechanism of enhanced low-rank coal flotation using a nanoemulsion collector based on zwitterionic/nonionic surfactants[J].China Surfactant Detergent & Cosmetics, 2025, 55(12): 1534-1543.

Figures/Tables 11

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References 26

[1]	Liu Zechen, Dong Xianshu, Liao Yinfei, et al. New insights into the adsorption and assembly of mixed collectors with different carbon chain lengths on the low-rank coal flotation by sum-frequency vibration spectroscopy and molecular dynamics simulation[J]. Powder Technology, 2024, 434: 119294. doi: 10.1016/j.powtec.2023.119294
[2]	李琳, 贺萌, 李晓腾. 生物基微乳捕收剂的制备及其在煤泥浮选中的应用[J]. 中国矿业大学学报, 2022, 51 (4) : 779-790.
[3]	桂夏辉, 邢耀文, 曹亦俊, 等. 低品质煤泥浮选过程强化研究进展及其思考[J]. 煤炭学报, 2021, 46 (9) : 2715-2732.
[4]	Xing Yaowen, Gui Xiahui, Cao Yijun, et al. Effect of compound collector and blending frother on froth stability and flotation performance of oxidized coal[J]. Powder Technology, 2017, 305: 166-173. doi: 10.1016/j.powtec.2016.10.003
[5]	Yang Haichang, Cai Yongle, Wu Lijun. Flotation behavior of raw and oxidized fine coal when mixed with coarse particles[J]. Fuel, 2018, 232: 225-232. doi: 10.1016/j.fuel.2018.05.155
[6]	Cheng Yali, Chen Jun, Min Fanfei, et al. Research on the flotation efficiency of alcohol/ether alcohol frothers for common collectors: Insight of molecular dynamics simulations[J]. Applied Surface Science, 2023, 614: 156233. doi: 10.1016/j.apsusc.2022.156233
[7]	王成勇, 邢耀文, 夏阳超, 等. 离子型表面活性剂对低阶煤润湿性的调控机制[J]. 煤炭学报, 2022, 47 (8) : 3101-3107.
[8]	Dey Shobhana. Enhancement in hydrophobicity of low rank coal by surfactants: A critical overview[J]. Fuel Processing Technology, 2012, 94 (1) : 151-158. doi: 10.1016/j.fuproc.2011.10.021
[9]	Karthikeyan Muthusamy, Wu Zhonghua, Mujumdar Arun S. Low-rank coal drying technologies-current status and new developments[J]. Drying Technology, 2009, 27 (3) : 403-415. doi: 10.1080/07373930802683005
[10]	Wen Baofeng, Xia Wencheng, Sokolovic Jovica M. Recent advances in effective collectors for enhancing the flotation of low rank/oxidized coals[J]. Powder Technology, 2017, 319: 1-11. doi: 10.1016/j.powtec.2017.06.030
[11]	Xia Yangchao, Yang Zili, Zhang Rui, et al. Performance of used lubricating oil as flotation collector for the recovery of clean low-rank coal[J]. Fuel, 2019, 239: 717-725. doi: 10.1016/j.fuel.2018.11.086
[12]	Lu Ying, Wang Xuming, Liu Weiping, et al. Dispersion behavior and attachment of high internal phase water-in-oil emulsion droplets during fine coal flotation[J]. Fuel, 2019, 253: 273-282. doi: 10.1016/j.fuel.2019.05.012
[13]	Liu An, Fan Panpan, Qiao Xiaoxiao, et al. Synergistic effect of mixed DDA/surfactants collectors on flotation of quartz[J]. Minerals Engineering, 2020, 159: 106605. doi: 10.1016/j.mineng.2020.106605
[14]	Luo Jing, Huang Kaixuan, Zhou Xin, et al. Elucidation of oil-in-water emulsions stabilized with celery cellulose[J]. Fuel, 2021, 291: 120210. doi: 10.1016/j.fuel.2021.120210
[15]	Zhang Rui, Xia Yangchao, Guo Fangyu, et al. Effect of microemulsion on low-rank coal flotation by mixing DTAB and diesel oil[J]. Fuel, 2020, 260: 116321. doi: 10.1016/j.fuel.2019.116321
[16]	Zhou Feng, Yan Chunjie, Wang Hongquan, et al. The result of surfactants on froth flotation of unburned carbon from coal fly ash[J]. Fuel, 2017, 190: 182-188. doi: 10.1016/j.fuel.2016.11.032
[17]	Li Zhe, Kong Yibo, Ma Zhenchao, et al. New insights into the role of interfacial components in oil-in-water nanoemulsion collector for low rank coal flotation[J]. Physics of Fluids, 2025, 37 (9) : 092006.
[18]	Li Wenfeng, Wang Hainan, Li Xin, et al. Effect of mixed cationic/anionic surfactants on the low-rank coal wettability by an experimental and molecular dynamics simulation[J]. Fuel, 2021, 289: 119886. doi: 10.1016/j.fuel.2020.119886
[19]	Li Zhe, Xu Derong, Yuan Yongjie, et al. Advances of spontaneous emulsification and its important applications in enhanced oil recovery process[J]. Advances in Colloid and Interface Science, 2020, 277: 102119. doi: 10.1016/j.cis.2020.102119
[20]	Liu Guangyi, Yang Xianglin, Zhong Hong. Molecular design of flotation collectors: A recent progress[J]. Advances in Colloid and Interface Science, 2017, 246: 181-195. doi: S0001-8686(17)30229-4 pmid: 28532662
[21]	Suyantara Gde Pandhe Wisnu, Hirajima Tsuyoshi, Elmahdy Ahmed Mohamed, et al. Effect of kerosene emulsion in MgCl₂ solution on the kinetics of bubble interactions with molybdenite and chalcopyrite[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2016, 501: 98-113. doi: 10.1016/j.colsurfa.2016.04.039
[22]	邢耀文, 桂夏辉, 韩海生, 等. 颗粒气泡黏附科学——微纳尺度下颗粒气泡黏附试验研究进展[J]. 煤炭学报, 2019, 44 (6) : 1857-1866.
[23]	Kong Yibo, Li Zhe, Lu Hang, et al. Emulsion collector formed by phase inversion composition (PIC) process for low-rank coal flotation: bubble-particle and emulsion-particle interaction mechanisms[J]. International Journal of Coal Preparation and Utilization, 2025: 1-24.
[24]	Meng Junqing, Wang Lijuan, Wang Jie, et al. Molecular mechanism of influence of alkyl chain length in ionic surfactant on the wettability of low rank coal[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2024, 680: 132661. doi: 10.1016/j.colsurfa.2023.132661
[25]	程万里, 邓政斌, 刘志红, 等. 煤泥浮选中矿物颗粒间相互作用力的研究进展[J]. 矿产综合利用, 2020, 3: 48-55.
[26]	Kong Yibo, Lu Hang, Li Yunchang, et al. Polar-nonpolar collector hybrids boosted nanoemulsion for improving low-rank coal flotation[J]. Physics of Fluids, 2025, 37 (2) : 22029. doi: 10.1063/5.0254820

种类	柴油/g	AEO-7/g	EAB-40/g	去离子水/g
#1	2.50	2.00	0.50	25.00
#2	2.50	1.25	1.25	25.00
#3	2.50	0.50	2.00	25.00
#4	2.50	2.50	0.00	25.00
#5	2.50	0.00	2.50	25.00

Mechanism of enhanced low-rank coal flotation using a nanoemulsion collector based on zwitterionic/nonionic surfactants

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