Study on effect of coal dust particle size on wettability of surfactant compounding solution

doi:10.16265/j.cnki.issn1003-3033.2023.03.1752

Abstract

Abstract:

To study the effect of coal dust particle size on the wetting ability of surfactant compound solutions, three Hongliu coal samples with diameter length ranges of less than 74, 74-104, and 104-147 μm were used for the sedimentation test. Five surfactants, sodium dodecyl sulfate (SDS), fatty acid methyl ethoxylate sulfonate (FMES), sodium alcohol ether sulphate (AES), isooctyl ethoxylate (JFC) and octyldecyl glucoside (APG), were selected and compounded pairwisely at a mass ratio of 1∶1 to form 10 compound combinations, and the sedimentation tests were conducted on the monomer and compound solutions, respectively, to investigate the effect of different particle sizes on the wetting ability of coal dust in the compound solutions and in the compound solutions. The settling rate of coal dust in the compound solution and the surfactant monomer solution was investigated. The results show that: the particle size of coal dust does not affect the synergistic wetting effect between surfactants, but affects the degree of synergistic wetting between surfactants. The wetting ability of different combinations does not change due to the change in particle size of coal dust. The increase in the concentration of the compound solution improves the wetting ability of large particle size coal dust more obviously than that of small particle size coal dust. The combination of SDS and JFC has good wetting effect on different particle sizes of coal dust. The IR spectra of the coal samples before and after surfactant treatment showed that SDS and JFC could synergistically improve the wettability of coal dust.

Key words: surfactant, compound solution, wettability, particle diameter, coal dust, sedimentation velocity

LIAO Maolin, JIANG Bingyou, ZHANG Xiaoyi, TAO Wenhan, JI Ben. Study on effect of coal dust particle size on wettability of surfactant compounding solution[J]. China Safety Science Journal, 2023, 33(3): 96-102.

Figures/Tables 8

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红外光谱波数范围/cm^-1	原煤		SDS处理		JFC处理		SDS+JFC处理
红外光谱波数范围/cm^-1	峰面积	比例/%	峰面积	比例/%	峰面积	比例/%	峰面积	比例/%
3 600~3 000	23.86	16.41	20.09	18.74	35.03	22.3	52.17	25.27
2 980~2 800	3.76	2.59	3.24	3.02	4.93	3.14	4.36	2.11
1 750~1 000	115.61	79.53	82.22	76.69	115.05	73.24	147.4	71.39
890~720	2.13	1.47	1.66	1.55	2.07	1.32	2.55	1.23

煤样	拟合关系式	R²
1号煤样	V=7.038 5 lnC+29.609	0.961 1
2号煤样	V=9.618 8 lnC+42.522	0.982 6
3号煤样	V=60.669 lnC+252.16	0.924 8

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