Correlation between the Roga index and the free-swelling index of coal

Literature data on the properties of fractions of different density obtained by liquid centrifuging of metamorphic coal reveal the relation between the Roga index RI and the free-swelling index SI , which describe different aspects of clinkering. A correlation is obtained between RI and SI , whose c...

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Bibliographic Details
Published inCoke and chemistry (New York, N.Y.) Vol. 52; no. 11; pp. 473 - 476
Main Author Gagarin, S. G.
Format Journal Article
LanguageEnglish
Published Heidelberg Allerton Press, Inc 01.11.2009
Subjects
Chemistry
Chemistry and Materials Science
Coal
Industrial Chemistry/Chemical Engineering
Coal Sample
Inertinite
State Standard GOST
Metamorphic Development
Vitrinite
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Summary:Literature data on the properties of fractions of different density obtained by liquid centrifuging of metamorphic coal reveal the relation between the Roga index RI and the free-swelling index SI , which describe different aspects of clinkering. A correlation is obtained between RI and SI , whose characteristics depend on the metamorphic stage of the coal. The results suggest that RI should be replaced by SI in dividing coal with a plastic-layer thickness y < 6 mm (D, SS, and TS coal) into subgroups, within the framework of the unified coal classification (State Standard GOST 25543-88).
ISSN:1068-364X
1934-8398
DOI:10.3103/S1068364X09110027