Experimental study on the effects of chemical composite additive on the microscopic characteristics of spontaneous combustion coal

• Published in: Environmental science and pollution research international Vol. 27; no. 5; pp. 5606 - 5619
• Main Authors: Pan, Rongkun, Ma, Junwei, Zheng, Ligang, Wang, Jian
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.02.2020; Springer Nature B.V
• Subjects: Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Atomic force microscopes; Atomic force microscopy; Carbon; Coal; Coal mining; Combustion; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental science; Fourier transforms; Heat; Infrared radiation; Infrared spectroscopy; Morphology; NMR; Nuclear magnetic resonance; Organic chemistry; Porosity; Prevention; Reagents; Research Article; Roughness; Spectroscopy, Fourier Transform Infrared; Spectrum analysis; Spontaneous Combustion; Waste Water Technology; Water; Water Management; Water Pollution Control; Chemical composite additive; Active groups; Microscopic structure; Coal spontaneous combustion; Mechanism analysis
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-019-07340-y

In order to study the effects of chemical composite additive (CCA) on the microscopic characteristics of spontaneous combustion coal, atomic force microscope and Fourier transform infrared spectroscopy technology were used to study the microstructure and active groups of spontaneous combustion coal. The roughness, three-dimensional surface morphology, microscopic pore structure, infrared spectrum, and active group content of raw coal samples and coal samples treated with water or different concentrations of CCA were analyzed. The experimental results showed that compared with the raw coal, the roughness Rq and Ra of the CCA-treated coal samples decreased with increasing CCA concentration, and the surface topography of the microscopic structure tended to be flat and smooth, and the size becomes smaller and the depth becomes shallow of pore. In the raw coal samples and coal samples treated with water and CCA, the main types of active groups remained constant. However, the contents of these groups changed, and the order of the contents of main types of active groups is water-treated > raw coal (untreated) > CCA-1% treated > CCA-5% treated > CCA-10% treated > CCA-20% treated. In addition, the mechanism of the CCA inhibition of coal spontaneous combustion was discussed and analyzed.