表面活性剂结构对细粒煤过滤脱水的影响及其机理研究

doi:10.3969/j.issn.1001-1803.2022.09.006

Abstract

Abstract:

In order to reduce the moisture content of fine coal, both nonionic polyoxyethylene surfactants with different hydrophobic groups such as AEO₉, LAE₉, OP₉ and surfactants with different hydrophilic groups including AEO₄, AEO₇, AEO₉, AEO₁₅, and AEO₂₀ were selected for fine coal filtration dewatering experiments. The filter cake moisture, filter speed, filter cake specific resistance and permeability were used as the evaluation indexes for the dewatering effect. The surface tension, infrared spectroscopy, wetting heat, adsorption capacity and Zeta potential were employed. The results of the fine coal dewatering experiments show that AEO₉ among the surfactants with different hydrophobic groups has best performance, and AEO₇ among AEO series surfactants with different hydrophilic groups has best performance. The mechanism of the surfactant AEO₇ in the filtration and dewatering of fine coal was studied. The obtained results show that when the dosage of AEO₇ is 120 mg/L, the maximum amount of oxygen-containing functional groups have been decreased and the lowest wetting heat of the fine coal treated by AEO₇indicating that the hydrophobicity of the coal surface has significantly been enhanced. At this time, the moisture content of the filter cake is reduced by 4.66%. The surface tension of the filtrate solution hardly decreases when the dosage of AEO₇ agent exceeds 120 mg/L. The adsorption capacity results show that when the surfactant dosage exceeds 120 mg/L, it is possible that double-layer adsorption on the coal surface may make the coal surface hydrophilic, thereby weaken the filtration and dewatering performance.

Key words: fine coal, dewatering, surfactant, hydrophobicity

CLC Number:

TQ423

Zhao Ke,Liu Shengyu,Zhang Suhong. Effect of surfactant structure on filtration dewatering of fine coal and its mechanism research[J].China Surfactant Detergent & Cosmetics, 2022, 52(9): 951-959.

Figures/Tables 17

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References 23

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粒级/mm	产率/%	灰分/%	累计
粒级/mm	产率/%	灰分/%	产率/%	灰分/%
0.5~0.25	34	27.47	34	27.47
0.25~0.125	13.98	23.46	47.98	26.30
0.125~0.075	13.94	24.60	61.92	25.92
0.075~0.045	16.03	24.19	77.95	25.56
<0.045	22.05	25.17	100	25.48
合计	100	25.48

煤样	润湿热/（J/g）
原煤	-3.25
AEO₉+原煤	-1.659
LAE₉+原煤	-2.162
OP₉+原煤	-1.68

煤样	润湿热/（J/g）
原煤	-3.25
AEO₄+原煤	-1.876
AEO₇+原煤	-1.362
AEO₉+原煤	-1.659
AEO₁₅+原煤	-2.011
AEO₂₀+原煤	-1.744

煤样	润湿热/（J/g）
原煤	-3.25
20 mg/L-AEO₇+原煤	-1.362
120 mg/L- AEO₇+原煤	-1.116
160 mg/L- AEO₇+原煤	-1.327

Effect of surfactant structure on filtration dewatering of fine coal and its mechanism research

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