Citation

Xu J, Ou S, Liu J, Jin L, Wang J. China Saf. Sci. J. 2022; 32(1): 118-126.

Copyright

(Copyright © 2022, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2022.01.016

PMID

unavailable

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. © 2022, Editorial Department of China Safety Science Journal. All rights reserved.

Language: zh