Study on the Relationship between Chemical Structure and Thermoplasticity of Moderately Metamorphic Coking Coal

Abstract—The quality of coke is to some extent closely related to the technological properties of coking coals due to the differences in chemical structure of coking coals with various degrees of metamorphosis. To explore the correlation between the chemical structure of coking coal and thermoplastic index, in order to better grasp the properties of coking coal, reduce the waste of coking coal resources, and help to achieve the goal of “dual carbon.” The correlation between the chemical structure and thermoplastic index was investigated by fitting FT-IR spectra of eight moderately metamorphosed coking coals and the determination of the caking index and Gieseler fluidity. Research shows that a good correlation can be observed between the average aliphatic side chain length, aromaticity and the aromatic hydrogen rate and the leverage diagram of the volatile fraction effect of coking coal; extremely close links between the three structural parameters and the thermoplastic properties at the same time; The chemical structure parameters can be used to predict the volatile fraction and thermoplastic properties of coking coals.