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1 Polish Journal of Applied Chemistry

1 2002

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Physicochemical studies of the changes of properties and structure of medium rank coals during carbonization

Jasieńko S., Kidawa H., Świetlik U.

Polish Journal of Applied Chemistry

2002

Vol. 46, nr 2

57-79

Changes of properties and structure of coals during carbonization in the 300-15000C temperature range have been investigated. Medium rank hard coals (gas coal, gas-coking coal, orthocoking coal, metacoking coal and semicoking coal) as well as vitrains separated from them were studied. Proximate and ultimate analyses, coking properties, density, thermogravimetry, optical and scanning microscopy and X-ray diffraction were carried out for all the studied samples. The following successive carbonization stages were observed: presoftening, plasticity, resolidification and formation of semicoke and coke structures. Special attention was given to the formation of the anisotropic coke texture and its influence on the coke properties. Differences in carbonization behavior of the coals and vitrains were described. The role of petrographic constituents of coals - vitrinite, exinite and inertinite - in formation of coke structure was discussed.