Experimental Study on the Effect of Acidification Time on the Microstructure of Anthracite
Acidification time is very important to the modification effect of coal seam.Taking Guizhou low-permeability anthracite as the research object,6％hydrofluoric acid was used as the modified main acid solution,and the combination of experimental measurement and theoretical analysis was used to explore the evolution of functional groups and microcrystalline structure in coal under the action of acidification time.The correlation between the functional group content and the microcrystalline structure of coal was analyzed.The results show that with the extension of acidification time,the relative content of aromatic structure and oxygen-containing functional groups of the experimental coal samples continues to increase,and there is a mutual transformation relationship between C-O and C=O stretching vibrations.During the acidification process,the relative content of the fat structure of the experiment coal sample has obvious time characteristics.From 0 to 6 hours of acidification,the fat structure changes greatly,and the fat structure tends to be stable from 9 to 12 hours of acidification.The significant increase of hydroxyl ether oxygen bond and hydroxyl π hydrogen bond leads to the fact that the hydroxyl content of coal samples acidified for 3,6 and 9 h is always higher than that of unacidified coal samples.During the acidification process,the change of aromatic layer spacing of the experimental coal samples is related to the change of fat structure.The stacking height and ductility of the coal samples under acidification vary from-6.13％to 22.09％and 36.66％to 66.75％,respectively.The research results provide a theoretical basis for the optimization of acidification modification time.
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维普
