The apparatus makes it possible to determine the ability of the
sintering coals at heating under conditions of free swelling in the tube to give coke residue of increased volume by measuring the
residue of increased volume by measuring the difference between the height of the coal (or its mixture with the
coal ash) before and after heating it in a tube furnace for 15 min at a temperature of 550 °C.
temperature of 550 °?. The apparatus is easy to maintain and not difficult to master by the operator. Simultaneously
two samples are tested simultaneously in two parallels. The apparatus makes it possible to clearly distinguish between lean and weakly calcining coals. The data obtained
are well connected with the peculiarities of behaviour of coals at coking in mixtures.
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