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Www.wstyler.
Increased mining interest in Haver Hydro-Clean
T he recently developed Haver
Hydro-Clean washing unit from
St Catharines, Ontario-based WS
Tyler has been seeing increased interest
from the mining industry. There are four
main models the HC 350, HC 700 and
HC 1000 and HC2000. In total, there
are now over 40 installed units
according to the company, including 10
in Africa; 25 in Europe and 6 in the
Americas. Mining references to date
include diamond, gold and platinum
operations, including those mounted on
diamond mining vessels. One of the key
North American customers is XS Platinum
in Alaska, which now has two HC 1000s,
which are being used to reprocess
dredged placer tailings from historical
mining. The company also plans to mine
virgin platinum bearing gravels.
Hydro-Clean is designed to effectively
clean deleterious material from industrial
minerals, metals and aggregate, while at
the same time reducing water
consumption by up to 75% over
traditional log washers. Taking a maximum feed
material size of up to 150 mm into its vertical
drum, the Hydro-Clean employs high-pressure
nozzles, rotating at 90 rpm, to spray up to
90% recycled water on the material with
pressures up to 2,900 psi. The washing unit
removes silt and clay particles as small as 63
microns from mineral mixtures. With its short
retention times can process up to 400 t/h
depending on the model size and application.
Due to its compact size and weight, overall
operating and structural costs are considerably
lower than with traditional washing systems,
which also require more equipment and a
greater footprint. A traditional washing system
can require up to three screens along with a
log washer or screw. With a Hydro-Clean unit,
the producer only needs an additional wash
screen for the Hydro-Cleans discharged
material.
The Hydro-Clean is best suited for use in
clay-heavy material deposits. The dirty material
is fed via hopper to a vertical washing
drum, where high-pressure nozzles
mounted at the top rotate and spray the
material with water. The water streams
spread and wash the material at high
pressure, effectively interacting with the
material to break up agglomerates and
clean the particles of stubborn material.
The turbulence in the drum creates
additional scrubbing and abrasive forces
that enhance the cleaning process as
the material travels down the drum
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cylinder. And because high-pressure
streams of water are injected into areas
of the rock that are difficult to reach
with traditional cleaning methods like
log washers or screws, the end result is
a cleaner product that generates higher
selling value.
During the cleaning process, the
washed material works its way down
the drum and exits onto a discharge
conveyor that leads to a standard wash
screen, which removes any remaining
dirt or clay still on the stone as it
fractionates the material. The resulting dirty
water flows through polyurethane screen mesh
installed in the sides of the washing drum and
is collected by a waste water pipe, which sends
the water to a treatment system for additional
fine screening.
Water consumption ranges from 27 to 211
gpm, depending on application and model
sizecompared to log washers that can require
up to 800 gpm of water. Power requirements
for the Hydro-Clean are no higher than 225
kW on the largest model.
Www.wstyler.
