Zheng Chunshan, Qian Suqian, Jiang Bingyou, Xue Sheng, Wang Xiaohan, Li Cancan, Tang Mingyun
Ministry of Education Key Laboratory of Safe and Effective Coal Mining, Anhui University of Science and Technology, Huainan, Anhui 232001, China.
School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China.
ACS Omega. 2024 Aug 12;9(33):35990-35998. doi: 10.1021/acsomega.4c06012. eCollection 2024 Aug 20.
In order to reduce the occupational health hazard of coal dust to miners, surface tension and viscosity tests and bituminous coal powder sedimentation experiments were conducted. A composite dust suppressant with bonding-wetting effects was developed. Meanwhile, based on the FTIR test and peak-differentiating curve fitting, the changes of peak areas of coal samples before and after dust suppressant treatment were investigated, with quantitative analysis on hydrophilic and hydrophobic groups. Gravity drop weight tests and Malvern particle size analyses were carried out. The particle size distribution was studied based on the Boltzmann function model. The characteristic particle size theory was adopted to analyze dust reduction performance and time's effect on the performance. Results show that the surface tension of the composite dust suppressant is 31.02 ± 0.09 mN/m with the viscosity being 84.60 mPa·s for the mixture of 0.1% SDS solution and 0.4% CMC-Na solution being 1:5. The ratio of the hydrophilic group of bituminous coal reaches 97.37% affected by the dust suppressant with a good wetting and cohesiveness effect. The characteristic particle size of dust increases by 11.77 and 46.67%, rises by 7.56 and 36.89%, and grows by 10.56 and 32.96%, respectively. The compressive strengths of the Shenmu coal sample and Lucun coal sample increase by 82.86 and 66.72% compared with that of raw coal after 48 h of dust suppressant treatment. The breakage degree at the end face of treated coal is smaller than that of raw coal. The composite dust suppressant makes the particles in coal more cohesive and effectively weakens the dust-producing property. Research results are of practical significance for improving the effect of water injection on dust reduction.
为降低煤尘对矿工的职业健康危害，进行了表面张力和黏度测试以及烟煤粉沉降实验。研制出一种具有黏结-湿润作用的复合抑尘剂。同时，基于傅里叶变换红外光谱（FTIR）测试和峰区分曲线拟合，研究了抑尘剂处理前后煤样峰面积的变化，对亲水基团和疏水基团进行了定量分析。开展了重力滴重测试和马尔文粒度分析。基于玻尔兹曼函数模型研究了粒度分布。采用特征粒径理论分析了抑尘性能以及时间对性能的影响。结果表明，0.1% SDS溶液与0.4% CMC-Na溶液按1:5混合而成的复合抑尘剂表面张力为31.02±0.09 mN/m，黏度为84.60 mPa·s。受抑尘剂影响，烟煤亲水基团比例达到97.37%，具有良好的湿润和黏结效果。粉尘的特征粒径分别增大11.77%和46.67%， 分别升高7.56%和36.89%， 分别增长10.56%和32.96%。抑尘剂处理48 h后，神木煤样和芦村煤样的抗压强度分别比原煤提高了82.86%和66.72%。处理后煤块端面的破碎程度小于原煤。复合抑尘剂使煤中的颗粒更具黏结性，有效削弱了产尘特性。研究结果对提高注水降尘效果具有实际意义。
