In the context of a roller crusher:
The roller crusher operates on three floors of a substantially built
building.
The top floor contains a feed hopper,
The hopper feeds the rolls on the second floor. The feed passes through the
rolls and is crushed. The size that the material is crushed to is regulated
by a beam (or beams) which carries a weight and keeps the rolls in tension.
Having passed through the rolls and down to the bottom floor of the crusher
house the crushed material is fed through a trommel (or series of trommels)
which comprises of an inclined cylindrical sieve. Material of the required
grade will pass through the holes in the trommel whilst oversize material
works its way down the trommel to the raff wheel (got there eventually).
The raff wheel looks something like a waterwheel. Its purpose is to lift
the oversize material from the end of the trommel back up to the top floor
of the crusher house where it is than fed back into the feed hopper and back
through the rolls.
For illustrations and further info try "Ore dressing at Devon Great
Consols". This is now out of print , but Mike Moore should have copies.
Rick Stewart
----- Original Message -----
From: "Andy Cuckson" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, November 06, 2008 1:19 PM
Subject: RAFF WHEEL DEFINITION
Fellow Listees,
Can anyone give me a succinct definition for a raff wheel, used with
crushing
rolls (for metalliferous ores, e.g. galena)?
Many thanks.
Andy Cuckson
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