Effect of Microwave Radiation on the Microstructure of Coking Coal Samples

In order to study the effect of microwave reforming process on the organic functional group structure (the way of organic combination of elements such as C, H and O) and carbon structure (carbon orderliness, microcrystalline structure, etc.) of different coking coals. Pre-treatment of coking coal (100, 200, 300 W) was carried out by 100s radiation treatment at different power, and the temperature was controlled below 200°C to prevent the coking coal from cracking. The functional group structure and carbon structure of coking coal before and after microwave treatment were analyzed using infrared spectroscopy, Raman spectroscopy methods. The results showed that with the prolongation of the microwave radiation treatment time, the overall trend of aroma fa first decreased, then increased and then decreased. The variation of DOC, the degree of aromatic ring polymerisation, varied considerably from one coal sample to another, and the ratio of the length of the main chain of the aliphatic chain to the length of the branched chain, A(CH2)/A(CH3), showed a U- or W-shaped variation. The oxygen-containing functional group structural parameter C' shows an overall increasing trend. The peak position difference PG-D between the D and G peaks ended up showing an overall decreasing trend, and the area ratio ID/IG between the D and G peaks showed a decreasing trend or the final result was basically the same as the beginning. The physical and chemical properties of coking coal were elucidated to characterize the reactive carbonaceous base point during the gasification reaction and to provide basic theoretical support for the preparation of low reactivity-high quality coke.