Discussion on Fourier transform infrared spectroscopy analysis of coking coal and anthracite in Panjiang mining area
GOU Rentao1, JIANG Chengyu*1,2, XU Shiqing1,2, LIN Huaying1 JIAO Anjun1, WANG Chen1,2
1. School of Mining,Guizhou University,Guiyang 550025,China; 2. Guizhou Mining Safety Technology Engineering Center for Complex Geology,Guizhou Province,Guiyang 550025,China
Abstract：The chemical composition and structure of coal are closely related to its physical and chemical properties. In order to explore the influence of different metamorphic degree of coal in Panjiang mining area of Guizhou on the distribution characteristics of functional groups and the difference of structural parameters of coal, the representative coking coal (medium metamorphic grade coal) and anthracite (high metamorphic grade coal) in Panjiang mining area of Guizhou were selected and tested by Fourier transform infrared spectroscopy(FTIR). Combined with peak fitting technology, the functional group characteristics and structural parameters of two kinds of coal were compared and analyzed. The results showed that with the deepening of coal metamorphism degree, the mass fraction of moisture and volatile matter in coal decreased from 1.60% and 28.8% to 1.28% and 9.10%, respectively. Meanwhile, the mass fraction of fixed carbon increased from 60.59% to 77.69%. It could be seen from the peak fitting analysis that the component of oxygen-containing structure and methyl group gradually decreased with the increase of coal metamorphism degree, and the fitting degree was slightly lower than that of aromatic hydrocarbon structure and aliphatic hydrocarbon structure. The content of methylene was higher than that of methyl, and methylene was more active in the oxidation process. The calculation results of structure parameter showed that the aromaticity (I) increased from 0.43 to 1.12 with the increase of coal metamorphism degree. Meanwhile, the aromatic ring condensation degree (DOC) increased from 2.18 to 5.90, and the maturity (M) increased from 0.81 to 0.97, indicating that the degree of aliphatic chain length gradually decreased, the degree of branching increased, and the organic matter also gradually increased.
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