ISSN 1068-364X, Coke and Chemistry, 2018, Vol. 61, No. 2, pp. 38–41. © Allerton Press, Inc., 2018.
Original Russian Text © T.A. Kushnareva, E.L. Sorokin, 2018, published in Koks i Khimiya, 2018, No. 2, pp. 11–14.
Clinkering Properties of Individual Fractions
of Enriched Poorly Clinkering Coal
T. A . Kushnareva
and E. L. Sorokin
Ukrainian National Metallurgical Academy, Dnepropetrovsk, Ukraine
Received January 16, 2018
Abstract—The clinkering properties of individual fractions of enriched poorly clinkering coal with limited
metamorphic development are studied. Plastometric and dilatometric data are employed in studying the clin-
kering properties. It is found that, with change in the density of the individual fractions, their clinkering prop-
erties also change significantly. The results suggest that the difference in clinkering properties of individual
fractions of enriched poorly clinkering coal is mainly due to the different quantity of liquid mass, which also
differs in viscosity. On the basis of the results, optimal fractions of enriched poorly clinkering coal for use in
coking batch may be formulated.
Keywords: clinkering, dilatometry, plastometry, ash content, organic mass, plastic mass, volatiles, coal swell-
ing, coal fractions, coking batch
On account of the continuing deterioration in the
coal available for coking and the shortage of coal with
good clinkering properties, coke plants employ greater
quantities of poorly clinkering coal with limited meta-
morphic development. This, in turn, results in the
importation of expensive coking coals [1–4].
We know that coal contains certain proportions of
organic and inorganic components, which are more or
less uniformly distributed within the mass of coal .
That determines the physical, chemical, and physico-
chemical properties of the coal and has some inf lu-
ence on the final product, coke.
In this context, we need to study the distribution of
clinkering components among the fractions in poorly
clinkering coal, in order to produce coke of satisfac-
tory quality in Ukraine, at the least expense .
In the present work, we investigate the clinkering
properties of individual coal fractions that are charac-
terized by limited metamorphic development and dif-
fer in density, so as to expand the base of coking coals.
Attempts to solve this problem were made previously
The clinkering properties are investigated by the
dilatometric method developed by the Institute of
Fossil Fuels and Dnepropetrovsk Metallurgical Insti-
tute [11–13]. It is evident from the results (Figs. 1–3)
that, with increase in density ρ of the coal particles,
the swelling index declines linearly from a maximum
value of 58 mm when ρ < 1.25 g/cm
to a minimum
value of 2 mm when ρ > 1.3 g/cm
. This may be due to
increase in the content of mineral and organic materi-
als with supermolecular structure, for which no plastic
state is observed. In the heaviest fraction (ρ > 1.3 g/cm
the swelling index is practically zero. That may be
attributed to decrease in content of the clinkering
components within this fraction.
Note that, with increase in density of the coal frac-
tions, other swelling characteristics also change. For
example, with the maximum swelling index (when ρ <
), the period before the onset of swelling
Fig. 1. Dependence of the swelling index I
on the density
ρ of the coal fractions.
<1.25 1.25–1.26 1.26–1.27 1.27–1.28 1.28–1.30 >1.30
y = –9.8857x + 65.933