Apparatus for determination of sinterability according to Gray-King.

The apparatus allows to determine one of the parameters of the
International Classification of Hard Coal, namely, the sinterability of a particular coal or
mixture of coal and inert additive by slow heating under standard conditions in quartz retorts.
retorts. The coke residue obtained is compared with a reference scale of samples and a verbal
description.
The apparatus consists of a multi-tube furnace which allows simultaneous
testing of 4 specimens simultaneously. The process of heating, maintaining the temperature during the test, and
switching off is carried out automatically by the programme.