Structural Defects and the Demineralization of Kuznetsk Basin Coal: Data from Raman Spectroscopy

Abstract

The carbon structure of intact and demineralized coal of different metamorphic development is studied by Raman spectroscopy. After removing the mineral component of coal, the defect content of the carbon framework is decreased, and its structure is enriched with graphite-like fragments. Demineralization of the initial samples results in similar structure of the carbon framework, regardless of the metamorphic stage of the coal; the ratio of the integral intensities of the D and G bands is 0.78 ± 0.03.