Zheng Lei, Liu Zongqi, Li Dewen, Wang Hongtu, Zhang Qingtao
School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, China.
China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400039, China.
ACS Omega. 2021 Jan 6;6(2):1378-1390. doi: 10.1021/acsomega.0c05005. eCollection 2021 Jan 19.
With the gradual improvement in coal mine mechanization and automation, the dust concentration at production sites is increasing significantly as the production efficiency improves, which not only poses a substantial threat to the occupational safety and health of workers but also affects the safe production and social stability of mines. At present, wet dust removal is the most economical and effective technical dust removal measure. However, most coal seams in China have poor wettability, unclear microscopic wetting mechanisms, and poor dust removal effects. Therefore, based on experiments and numerical analysis, this paper qualitatively studies the influencing factors of surfactants on coal wettability and quantitatively constructs an innovative evaluation model of the influence of the microstructure of coal and surfactants on wettability. First, based on C NMR experiments, the structural parameters of coal and several surfactants were obtained. Second, the wettability relationship between the coal and the surfactants was determined by optical titration, and the key factors affecting the wettability of coal dust and the wettability of the surfactants were selected. Then, using numerical analysis and function fitting analysis and combining the structural parameters with the coal wetting results, the relationship between the microstructure of the surfactants on different kinds of coal and the wettability of the coal samples was established. The results show that the ether group, the phenol or aromatic ether carbon, the fatty methyl group, and the aromatic methyl group in the surfactants have a substantial influence on the wettability. The research results can provide scientific guidance for the development of efficient and environmentally friendly compound dust suppressants to realize clean production in mines.
随着煤矿机械化和自动化程度的逐步提高，生产现场的粉尘浓度随着生产效率的提升而显著增加，这不仅对工人的职业安全与健康构成重大威胁，还影响着煤矿的安全生产和社会稳定。目前，湿式除尘是最经济有效的技术除尘措施。然而，我国多数煤层的润湿性较差，微观润湿机理不明确，除尘效果不佳。因此，本文基于实验和数值分析，定性研究了表面活性剂对煤润湿性的影响因素，并定量构建了煤与表面活性剂微观结构对润湿性影响的创新评价模型。首先，基于碳核磁共振（C NMR）实验，获取了煤和几种表面活性剂的结构参数。其次，通过光学滴定法确定了煤与表面活性剂之间的润湿性关系，筛选出影响煤尘润湿性和表面活性剂润湿性的关键因素。然后，利用数值分析和函数拟合分析，并将结构参数与煤的润湿结果相结合，建立了不同种类煤上表面活性剂的微观结构与煤样润湿性之间的关系。结果表明，表面活性剂中的醚基、酚或芳醚碳、脂肪甲基和芳甲基对润湿性有重大影响。研究结果可为开发高效环保的复合抑尘剂以实现煤矿清洁生产提供科学指导。
