Study on the microscopic mechanism and optimization of dust suppression by compounding biological surfactants

被引:35
|
作者
Wang, Kai [1 ,2 ,3 ]
Zhang, Yuchen [2 ]
Cai, Weiyao [2 ]
Pei, Xiaodong [2 ]
Hao, Haiqing [2 ]
Wang, Ziting [2 ]
机构
[1] China Univ Min & Technol, State Key Lab Coal Resources & Safe Min, Xuzhou, Jiangsu, Peoples R China
[2] China Univ Min & Technol, Sch Safety Engn, Xuzhou 22116, Jiangsu, Peoples R China
[3] China Univ Min & Technol, Minist Educ, Key Lab Coal Methane & Fire Control, Xuzhou, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
Biological surfactants; Biodegradable; Environmental friendly; Dust suppressant; Compound reagent; PERFORMANCE; AGENT; FILTRATION; FOAM;
D O I
10.1016/j.colsurfa.2021.126850
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In order to solve the problem of reducing the surface tension of pure water used in some spray dust reduction equipment, this study analyzed the action mechanism of the green biodegradable dust suppressant on coal dust from a microscopic point of view. Using orthogonal experiment design and response surface analysis method, the surface tension change of the green biodegradable composite dust suppressant and its influence on the wettability of coal dust is studied, several biological surfactants are added to water in nine groups in different proportions to prepare dust suppressants with the same total concentration. Through nine sets of sedimentation experiments with different configuration ratios, it is concluded that each set of compound dust suppressants can improve the wetting speed of coal dust to varying degrees. In the infrared spectroscopy experiment, we analyze the microscopic interaction mechanism of coal dust, compare the wettability of anthracite coal samples before and after treatment with the same quality dust suppressant through the change of functional groups. The internal mechanism of the biodegradable dust suppressant is explained from a two-dimensional curve, the low hydroxyl transmittance means high content, which effectively increases the hydrophilic groups on the surface of coal dust, thereby accelerating the wetting speed. The surface tension experiment showed that the use of compound reagents had a good synergistic effect. The lowest surface tension of the biodegradable dust suppressant is 28.515 mN/m in nine groups. Through response surface analysis method, the study finds the optimal value of the wetting speed of the dust suppressant, obtains the best ratio of each reagent in this new dust suppressant by using Design Expert 11.0. The optimal ratio is calculated as: 0.129 ml rhamnolipid, 0.044 ml lactone sophorolipid and 0.029 g surfactin per 100 ml of dust suppressant, the shortest wetting time is 31.777 s.
引用
收藏
页数:11
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