WINNING
Waste, fines, and product are normally
stockpiled on site.
be returned to the crusher. This will result
in valuable sized products being crushed
into fines.
Software packages have been developed
to help simulate the resultant wastes and
particularly fines that may be produced by
a specific crush and screen set-up, different
machine combinations, and settings. The
software models the behaviour of crushers
with different rock types based on laboratory
and process plant data. Adjustments can be
made to the settings, or changing the type of
equipment may optimise the process to give
the maximum aggregate production and to
minimise fines production.
The effectiveness of primary crushers is
influenced by the type of rock being crushed
and by the blasting method. Coarse-grained
Crushing of quarried rock is carried out in stages, with the primary crushing stage typically
carried out using jaw crushers or gyratory crushers, and subsequent secondary and tertiary
stages by cone or impact crushers.
The effectiveness
of primary crushers
is influenced by the
type of rock being
crushed and by the
blasting method.
The effectiveness of primary crushers is influenced by the type of rock being crushed and by
the blasting method. Coarse-grained material, such as quartzite or dolerite, will produce
fewer fines compared to a fine-grained material such as limestone or dolomite.
QUARRY SA | JULY/AUGUST 2018 _ 25