Organic sulphur as a main index for determining the genetic type of low-rank coals
Authors:
Butuzova L, Bechtel A, Turchanina O, Safin VA, Butuzov G, Isayeva L
Published in:
Bulletin of Geosciences, volume 80, issue 1;
pages: 3 - 8;
Received 30 July 2004;
Accepted in revised form 3 December 2004;
Keywords:
bituminous coals,
statistical analysis,
organic sulphur,
volatile matter yield,
dibenzothiophene/phenanthrene ratio,
hopanes,
13C-isotopes,
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Abstract
A statistical analysis of the quality of Donetz low-rank coals has been carried out using catalogue data and freshly-sampled coals. Thirty seven samples of bituminous coals with volatile matter contents ranging from 37.2% to 44.2% were used. All coals are closely clustered into groups of samples with different ranges of (O+N)
daf/C
daf atomic ratio. It has been shown that linear correlations exist between the S
îdaf and S
îdaf/C
daf ratio and V
daf. The correlation coefficients within the different sample groups have been found to be
r1=0.87;
r2=0.92, and
r3=0.98. They increase as the O
daf/C
daf interval is narrowed down, i.e. as the coal rank is more exactly defined. Similarly, a statistical dependence between the volatile matter yield and the organic sulphur content has been found for the Donetsk DG and G brand coals, with the correlation coefficients being
r = 0.91 and
r = 0.95, respectively. It was also found that some structural parameters of the coals correlate with S
odaf.