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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.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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