Study on synergistic effect of mixed surfactants on wetting bituminous coal

doi:10.16265/j.cnki.issn1003-3033.2025.03.0731

Abstract

Abstract:

In order to solve the problem that the traditional spray technology in coal mine dust pollution control is not ideal and the spray dust reduction performance is low, Sodium dodecyl sulfate (SDS), Coconut Diethanol Amide (CDEA) and Cocoamidopropyl Betaine(CAB-35) were selected in this paper. The wettability of the three surfactants was first analyzed macroscopically by contact angle test. Then, combined with molecular dynamics simulation and quantum chemical analysis, the action mechanism of single/compound surfactants on bituminous coal was studied from a microscopic perspective. The results show that among the single surfactants, SDS has the smallest contact angle and the largest molecular orbital energy difference, and is more likely to form high-strength hydrogen bonds with water molecules; the mixed surfactants all show better wettability of bituminous coal than single surfactants, and the contact angle is smaller when non-ionic surfactants are mixed with anionic or zwitterionic surfactants, and the contact angle reduction rate is also much greater than that of single solutions, and the synergistic effect is more prominent; In the CDEA+CAB-35 (4∶2) system, water and surfactants form more and higher strength hydrogen bonds, and the surfactant molecules pull each other to form a tight adsorption layer, which attracts water molecules to infiltrate the surface of coal dust and improves the wettability of coal dust to the best extent.

Key words: surfactants, wetting, bituminous coal, synergistic effect, molecular dynamics

CLC Number:

X936

LEI Miao, JING Deji, TONG Linquan, FAN Jingguang, JIA Xin, LIU Jianhua. Study on synergistic effect of mixed surfactants on wetting bituminous coal[J]. China Safety Science Journal, 2025, 35(3): 159-168.

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工业分析				元素分析
水分	灰分	挥发分	固定碳	C	H	N	S	O
0.84	7.21	24.26	67.69	83.3	4.0	7.89	1.12	3.69

复配比例	1∶5	2∶4	3∶3	4∶2	5∶1
CDEA∶CAB-35	A1	A2	A3	A4	A5
SDS∶CAB-35	B1	B2	B3	B4	B5
CDEA∶SDS	C1	C2	C3	C4	C5