Impactors
Primary Impactors
are now considered to be more productive
for recycling than compression crushers.
Compression
crushers and primary impactors are the basic
two main crushers used by aggregate producers
and recyclers of concrete and asphalt rubble.
Compression Crushers
Jaw crushers, cone crushers and
roll crushers are all utilised as compression
crushers to break up materials and were
designed to handle aggregates. Jaw crushers
are normally used as primary crushers providing
the first point of contact in the processing
plant, handling uncrushed rock. Due to their
small reduction ratio, jaws crushers are
normally used in combination with cone and
roll crushers in secondary and tertiary
roles to further reduce the size of materials
coming from previous phases of the processing
plant. The jaw/cone combination is most
common. However each of these types of compression
crusher has limitations when used for recycling
applications.
Impactors
Impact crushers shatter materials
by striking them with blow bars mounted
on a horizontal rotor. The speed of this
horizontal rotor can be varied according
to the type of materials being crushed and
the desired output. During the first half
of the 20th Century, impactors were primarily
used as secondary aggregate crushers. However
the end of the Second World War changed
this as specific horizontal-shaft impactors
were designed specifically as primary crushers
to process the left-over rubble from the
bombed cities.
Impactors Compared to Compression
Crushers
The revised post-war design of
impactors has major advantages over any
compression crusher combination for recycling
operations. In fact, primary impactors are
now considered to be more beneficial in
terms of their recycling ability, and for
many other aggregate crushing operations.
Recycling impactors are much quicker and
have a larger reduction ratio than jaw crushers.
Thus, they are more efficient and usually
do not require a secondary crusher.
If you are interested in purchasing impactors
from a company with an exceptional amount
of expertise and knowledge then please ring
N.H. Greaves & Co Ltd on 01709 582381
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