PSD, pore structure, and fractal characteristics of intake and return airway dust in Fushan gold mine

doi:10.16265/j.cnki.issn1003-3033.2022.01.016

Abstract

Abstract:

In order to study particle size and pore characteristics of dust in underground metal mines, with Fushan gold mine as an example, PSD and pore characteristics of its IAD and RAD were systematically investigated. Firstly, PSD of dust samples were measured by using laser particle size analyzer and scanning electron microscope (SEM), meanwhile, pore parameters were measured by low-pressure N₂ gas adsorption device. Then, fractal dimensions of particle size and pore volume were calculated according fractal theory, respectively. The results show that the particle size of RAD is less than that of IAD. Their most probable particle size are 7.19 and 23.58 μm, respectively, and the respirable dust percentage in them are 65% and 40%, respectively. However, the fine particles (particle size less than 1 μm) percentage in IAD (0.67%) is larger than that in RAD (0.39%). In addition, pore types in RAD and IAD are similar and mainly consist by impermeable closed pore, while RAD pore is more developed than IAD pore, which was caused by the blasting action in gold mines. Furthermore, both IAD and RAD feature significant fractal characteristics, and fractal dimensions of IAD, including particle size and pore volume, are larger than that of RAD, which indicates that PSD, surface roughness and pore complexity of IAD are all more complicated than that of RAD. Therefore, gold mines should pay more attention to IAD.

Key words: Fushan gold mine, intake airway dust (IAD), return airway dust (RAD), particle size distribution(PSD), pore structure, fractal dimension

XU Jingge, OU shengnan, LIU Jianguo, JIN Longzhe, WANG Jiaying. PSD, pore structure, and fractal characteristics of intake and return airway dust in Fushan gold mine[J]. China Safety Science Journal, 2022, 32(1): 118-126.

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编号	孔参数		计算模型
1	比表面积		BET(Brunauer-Emmett-Teller)
1	比表面积		Langmuir
2	孔体积	微孔	密度泛函理论 (Density Functional Theory)
2	孔体积	介孔	BJH (Barrett-Joyner-Halenda)
3	平均孔径	微孔	H-K (Horvath-Kawazoe)
3	平均孔径	全孔	BJH
4	孔径微积分分布		DFT

粉尘来源	比表面积/(m²·g^-1)		孔体积/(cm³·g^-1)			平均孔径/nm
粉尘来源	BET	Langmuir	DFT(微孔^*)	BJH(介孔^*)	总孔体积^*	H-K	BJH
IAD	3.319	5.780	0.001 3	0.011 8	0.013 1	1.278	10.61
RAD	4.386	7.970	0.001 6	0.018 0	0.019 6	1.342	11.61