(57) An apparatus for obtaining a comminuted "fines" product from a solid feed material,
a large proportion of the particles of which are greater than 1 cm, comprises a housing
having a lower region forming a crusher (10) and an upper region forming a classifier
(11). There is an inlet for the solid feed material leading to a hopper (22) from
whence feed material passes to a rotor (13) which causes the material to be flung
centrifugally outwards in the crushing chamber (23) where it is comminuted. As a result
of movement of the rotor, there is a predominantly upward air flow (F) from the crushing
chamber (23) to the classifier (11). This air flow entrains a high proportion of "fines"
which can be classified, in the classifier (11) using vanes (21), and collected.
The apparatus is capable of producing an output product having a very high proportion
of "fines" from even very abrasive feed material with particles of a size up to 5cm.
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