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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Published in | Coke and chemistry (New York, N.Y.) Vol. 52; no. 11; pp. 473 - 476 |
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Main Author | |
Format | Journal Article |
Language | English |
Published |
Heidelberg
Allerton Press, Inc
01.11.2009
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Subjects | |
Online Access | Get full text |
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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). |
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ISSN: | 1068-364X 1934-8398 |
DOI: | 10.3103/S1068364X09110027 |