Abstract
Based on experiments, a numerical analysis is used to quantitatively explore the influence of coal and surfactant microstructures on wettability. First, based on an infrared spectrum experiment, the distribution of oxygen-containing functional groups, aromatic hydrocarbons, and aliphatic hydrocarbons of coal and surfactants was obtained. Second, the wettability relationship between coal and different surfactants was determined by optical titration, and the coal dust wettability and surfaces were optimized. The key factors of the active agent wetting ability affecting lignite wetting mainly depend on the carbonyl, ether, and carboxyl groups in the surfactant. The factors affecting non-stick coal and gas coal wetting mainly depend on the ether group and aromatic amine in the surfactant. The factors affecting fat coal wetting mainly depend on the ether group and hydroxyl group in the surfactant. Finally, the factors affecting coking coal and anthracite wetting mainly depend on the surfactant ether group, aliphatic amine, and aromatic amine. Then, combining the structural parameters with the coal wetting results, the quantitative mathematical relationship between coal dust wettability, the important influencing factors of the surfactant, and the wettability index was established. Finally, a perfect and reasonable wettability evaluation model between coal and the surfactants was established. The relative activity of methyl ether and aromatic ether is greater than that of methyl ether, and the influence on the lignite, coking coal, and anthracite wettability conforms to the model . The influence on the non-caking coal and fat coal wettability conforms to the model , while the influence on the gas coal wettability conforms to the model Z = A + B1X1 + B2X2. In general, this study provides scientific guidance for the compounding of high-efficiency and environmentally protective composite dust suppressors to realize clean mine production.
Highlights
Coal dust is an increasingly serious problem in underground coal mines
The hydroxyl group of AEC is approximately 59% of the total functional groups followed by aromatic hydrocarbons accounting for 20.5% of the total, aliphatic hydrocarbons accounting for 8% of the total, fatty amines accounting for 7.6% of the total, and carbon−oxygen single bonds accounting for 3.5% of the total
Rapid osmotic T has a rich distribution of oxygen-containing energy-carrying groups, in which hydroxyl groups account for 55% of the total; CO− accounts for 5.5% of the total; carbonyl accounts for 3.7% of the total; ether bonds account for 4.5% of the total; fatty amines account for 20% of the total; and aliphatic hydrocarbons account for 9.6% of the total
Summary
Coal dust is an increasingly serious problem in underground coal mines. Traditional mine dust prevention measures have limited effectiveness and have not achieved the desired results. It has been found that even if the same dust suppressant is applied to different working surfaces, the results are different.[8,9]. Wang et al.[20] investigated the surface tension and contact angle of surfactants under different magnetization conditions, and the results showed that the magnetization of dust suppressants maintains their good wettability and decreases their required concentration by half. The coupling relationship between coal dust and the surfactant and the key factors affecting wettability have not been examined. Based on Fourier transform infrared spectroscopy experiments, this study selected coal samples from different coal ranks in six mines in China and nine different types of surfactants for infrared spectroscopy experiments to develop coal dust surface functional groups and different dust suppressants. The results have important theoretical and practical significance for guiding the research and development of mine dust suppressants
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