Influence of chelating agent and surfactant processing on wettability properties of coal

doi:10.16265/j.cnki.issn1003-3033.2025.05.1287

Abstract

Abstract:

In order to solve the problem of mixed heavy metal substances in coal hindering the infiltration of dust suppression solution into coal pores and cracks, resulting in a weakened wetting effect of coal, experiments were conducted to explore the synergistic effect of chelating agents and surfactants on coal wettability. Firstly, based on the water injection test platform and the dust cutting simulation test platform, six injection methods were designed to experimentally determine the antagonistic effect between surfactants and chelating agents. Then, the effects of six injection methods on the dust production characteristics and wetting effect of coal samples were studied through cutting tests and surface wettability analysis. Finally, spray dust suppression was conducted to test the settling efficiency of pulverized coal enhanced by different injection methods. The results show that the coal sample treated by first injecting the chelating agent followed by the surfactant exhibits the lowest dust production concentration, at only 170.93 mg/m³, which is 64.49% lower than the 481.33 mg/m³ in the pure water group. Furthermore, the sequential injection protocol employing prior a chelating agent infusion followed by a surfactant delivery exhibits the most significant improvement in coal wettability, with the fastest rate of wetting-induced sedimentation of coal dust. In addition, the coal samples treated by the above method achieve a dust suppression efficiency of 91.2% in in spray dust suppression tests. Through molecular simulation and theoretical analysis, injecting a chelating agent solution to decompose heavy metals in coal fractures can improve the fluidity of the solution in coal. Subsequently, injecting a surfactant solution further enhances the wettability of coal.

Key words: chelating agent, surfactant, liquid injection process, wettability, coal seam water injection, dust reduction

CLC Number:

LIN Hanyi, JIANG Bingyou, WANG Yifan, WANG Haoyu, YU Changfei. Influence of chelating agent and surfactant processing on wettability properties of coal[J]. China Safety Science Journal, 2025, 35(5): 169-177.

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References 24

[1]	周宏伟, 刘泽霖, 孙晓彤, 等. 深部煤体注水过程中渗流通道演化特征[J]. 煤炭学报, 2021, 46(3): 867-875.
	ZHOU Hongwei, LIU Zelin, SUN Xiaotong, et al. Evolution characteristics of seepage channel during water infusion in deep coal samples[J]. Journal of China Coal Society, 2021, 46(3): 867-875.
[2]	翁安琦, 袁树杰, 王晓楠, 等. 煤层注水降尘中表面活性剂复配应用研究[J]. 中国安全科学学报, 2020, 30(10): 90-95. doi: 10.16265/j.cnki.issn 1003-3033.2020.10.013
	WENG Anqi, YUAN Shujie, WANG Xiaonan, et al. Study on application of surfactant compound in coal seamwater injection for dust reduction[J]. China Safety Science Journal, 2020, 30(10): 90-95. doi: 10.16265/j.cnki.issn 1003-3033.2020.10.013
[3]	高建良, 关孟瑶, 张琛, 等. 高阶煤润湿过程中水分运移的低场核磁共振试验[J]. 中国安全科学学报, 2023, 33(10): 46-52. doi: 10.16265/j.cnki.issn1003-3033.2023.10.0009
	GAO Jianliang, GUAN Mengyao, ZHANG Chen, et al. Low-field nuclear magnetic resonance tests characterizing moisture transport during wetting of high-rank coal[J]. China Safety Science Journal, 2023, 33(10): 46-52. doi: 10.16265/j.cnki.issn1003-3033.2023.10.0009
[4]	李懿, 陆伟, 李金亮, 等. 煤层注射成胶型抑尘剂影响因素及抑尘效果研究[J]. 中国安全科学学报, 2024, 34(3): 171-178. doi: 10.16265/j.cnki.issn1003-3033.2024.03.1751
	LI Yi, LU Wei, LI Jinliang, et al. Study on influencing factors and dust suppression effect of coal seam injection gum-forming dust suppressant[J]. China Safety Science Journal, 2024, 34(3): 171-178. doi: 10.16265/j.cnki.issn1003-3033.2024.03.1751
[5]	YU Changfei, JIANG Bingyou, YUAN Liang, et al. Inhibiting effect investigation of ammonium dihydrogen phosphate on oxidative pyrolysis characteristics of bituminous coal[J]. Fuel, 2023, 333:DOI: 10.1016/j.fuel.2022.126352.
[6]	XIE Hongchao, NI Guanhua, LI Shang, et al. The influence of surfactant on pore fractal characteristics of composite acidized coal[J]. Fuel, 2019, 253: 741-753. doi: 10.1016/j.fuel.2019.05.073
[7]	NI Guanhua, XIE Hongchao, LI Shang, et al. The effect of anionic surfactant (SDS) on pore-fracture evolution of acidified coal and its significance for coalbed methane extraction[J]. Advanced Powder Technology, 2019, 30(5): 940-951. doi: 10.1016/j.apt.2019.02.008
[8]	HAN Weibo, ZHOU Gang, ZHANG Qingtao, et al. Experimental study on modification of physicochemical characteristics of acidified coal by surfactants and ionic liquids[J]. Fuel, 2020, 266: DOI: 10.1016/j.fuel.2019.116966.
[9]	WANG Cunmin, ZHOU Gang, JIANG Wenjing, et al. Preparation and performance analysis of bisamido-based cationic surfactant fracturing fluid for coal seam water injection[J]. Journal of Molecular Liquids 2021, 332: DOI: 10.1016/j.molliq.2021.115806.
[10]	YAN Song, HUANG Qiming, QIN Cunli, et al. Experimental study of wetting-seepage effect of microemulsion for the coal seam water injection[J]. Journal of Molecular Liquids, 2021,336: DOI: 10.1016/j.molliq.2021.116361.
[11]	KAURIN A, GLUHAR S, TILIKJ N, et al. Soil washing with biodegradable chelating agents and EDTA: effect on soil properties and plant growth[J]. Chemosphere, 2020, 260: DOI: 10.1016/j.chemosphere.2020.127673.
[12]	GLUHAR S, KAURIN A, LESTAN D. Soil washing with biodegradable chelating agents and EDTA: technological feasibility, remediation efficiency and environmental sustainability[J]. Chemosphere, 2020, 257: DOI: 10.1016/j.chemosphere.2020.127226.
[13]	CHEN Shuya, XIE Kunzhi, SHI Yanping, et al. Chelasting agent-introduced unconventional compound acid for enhancing coal permeability[J]. Journal of Petroleum Science and Engineering, 2021, 199: DOI: 10.1016/j.petrol.2020.108270.
[14]	NI Guanhua, SUN Qian, XUN Meng, et al. Effect of NaCl-SDS compound solution on the wettability and functional groups of coal[J]. Fuel, 2019, 257: DOI: 10.1016/j.fuel.2019.116077.
[15]	REN Bo, YUAN Liang, ZHOU Gang, et al. Effectiveness of coal mine dust control: a new technique for preparation and efficacy of self-adaptive microcapsule suppressant[J]. International Journal of Mining Science and Technology, 2022, 32(6): 1181-1196.
[16]	SHI Guoqing, HAN Cong, WANG Yanming, et al. Experimental study on synergistic wetting of a coal dust with dust suppressant compounded with noncationic surfactants and its mechanism analysis[J]. Powder Technology, 2019, 356: 1077-1086. doi: 10.1016/j.powtec.2019.09.040
[17]	ZHAO Zidong, CHANG Ping, XU Guang, et al. Comparison of the coal dust suppression performance of surfactants using static test and dynamic test[J]. Journal of Cleaner Production, 2021, 328: DOI: 10.1016/j.jclepro.2021.129633.
[18]	LIU Zhen, ZHU Muyao, YANG He, et al. Study on the influence of new compound reagents on the functional groups and wettability of coal[J]. Fuel, 2021, 302: DOI: 10.1016/j.fuel.2021.121113.
[19]	ZOU Quanle, ZHANG Tiancheng, MA Tengfei, et al. Effect of water-based SiO₂ nanofluid on surface wettability of raw coal[J]. Energy, 2022, 254: DOI: 10.1016/j.energy.2022.124228.
[20]	WANG Xiaohan, JIANG Bingyou, YUAN Liang, et al. Study on coupling chelating agent and surfactant to enhance coal wettability: experimental and theoretical discussion[J]. Fuel, 2023, 342: DOI: 10.1016/j.fuel.2023.127861.
[21]	SHI Guoqing, QI Jiamin, WANG Yanming, et al. Synergistic influence of noncationic surfactants on the wettability and functional groups of coal[J]. Powder Technology, 2021, 385: 92-105. doi: 10.1016/j.powtec.2021.02.056
[22]	RAMIREZ-LEAL R, CRUZ-CAMPAS M, ESTUARDO-MORENO H. Characterization of PM₁₀ particles by SEM-EDS[J]. Microscopy and Microanalysis, 2018, 24(S1): 1070-1071.
[23]	XU Lianman, WEI Hao, KANG Xinyue, et al. Study on the change law of physical and mechanical properties and wetting mechanism of coal body under the synergistic effect of chelation-adsorption[J]. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2022, 44(2): 4481-4493.
[24]	ANGGARA F, SASAKI K, SUGAI Y. Mineral dissolution/precipitation during co₂ injection into coal reservoir: a laboratory study[J]. Energy Procedia, 2013, 37: 6722-6729.

波段区域	I	II	III	IV
H₂O	6.08	50.29	5.74	37.89
A	2.05	55.92	3.04	38.99
B	2.54	51.06	3.32	40.08
Mix	5.56	63.26	5.07	26.11
AB	1.92	68.63	2.55	26.90
BA	2.85	47.23	3.09	46.83

试验组	喷雾前质量浓度/ (mg·m^-3)	喷雾后质量浓度/ (mg·m^-3)	降尘效率/%
H₂O	475.42	245.26	48.41
A	231.36	41.58	82.03
B	303.82	82.73	72.77
Mix	268.05	71.00	73.51
AB	170.93	15.04	91.20
BA	267.40	53.12	80.78