Relationship between coking coal quality and its micro-Raman spectral characteristics

Micro-Raman spectroscopy examination of 20 samples of coking coals (R-r = 0.84-1.43%) was performed. Spectral parameters were correlated with the basic rank and technological properties of coals. The G band FWHM and the A(G)/A(ALL) ratio decrease with the volatile matter content (V-daf) decrease and the all maceral reflectance scan (R-scan) value increase. The correlations between these parameters are stronger than those, between the G band FWHM and the A(G)/A(ALL), ratio, and the mean random vitrinite reflectance (R-r). Coking properties are weakly related to the Raman spectral characteristics of coal. Based on the Raman parameters G band FWHM and the A(G)/A(ALL) ratio, it may be possible to evaluate the volatile matter content (V-daf) and the all maceral reflectance scan (R-scan) value for coking coals. (C) 2014 Elsevier B.V. All rights reserved.