NEW EQUIPMENT
an average 12% moisture, making them
ready for market straight from the belts.
As an added benefit, the fully integrated
CDE AquaCycle thickener would allow
for up to 90% of the process water to be
recycled directly into the system for near-
independence from fresh water supplies.
Following a collaborative design
process with the customer, CDE
developed and built a Combo modular
plant to transform 60 tonnes per hour of
raw feed into washed 0-6mm river sand
and 0-1.5mm plaster.
Cyclone technology - the
state-of-the-art separation
methodology
Although bucket wheel technology
has been undeniably essential to the
growth of the construction industry in
South Africa, cyclone technology is now
replacing it on the market as ultra-colour
HD has replaced black and white TV – as
a natural evolution of materials processing
brought about by modern innovations
from forward-thinking research engineers.
A leading innovator in cyclone
technology, CDE has been designing and
delivering over 2 000 projects globally
since 1992 to increase the efficiency of
materials washing operations.
Cyclone technology involves the use
of centrifugal force to classify materials
rather than gravity. After extensive
testing to determine the proportion of
silt material to be removed from the raw
feed, the specification of a cyclone set
up is precisely calculated to ensure that
each client’s new hydrocyclone-based
system, such as the Ground Breakers’
all-in-one Combo wet processing and
water recycling plant, provides unrivalled
control over silt cut points and optimal
water recycling. Due to the design of
the cyclone unit, an increased number
of parameters are available to ensure
complete accuracy on the material cut
point. The silt exits the overflow at the
top of the cyclone with the wastewater,
to be sent to the integrated AquaCycle
water recycling system. The sand fraction
exits the cyclone at the bottom, ready for
dewatering, stockpiling and immediate
dispatch to market.
The Combo
Willem du Ploy, business development
manager for CDE Southern Africa says,
“CDE is fast growing its footprint in Africa
as sand and aggregates producers are
upgrading their installations to enjoy the
benefits of wet processing technology in
terms of more efficient production and
higher product quality.
30
JULY 2019
Pictured from left, are Johan Meintjes,
owner, Ground Breakers, Willem du
Plooy, CDE business development
manager for Sub-Saharan Africa and
JC Janse van Vuuren, owner, Ground
Breakers.
“With the respective successes met
by the CDE EvoWash sand washing
plant and the AquaCycle thickener in
South Africa, more operators are now
looking for a user-friendly solution that
incorporates both plants. Ahead of
the curve, CDE expert engineers have
created a patented all-in-one system,
the Combo. Pre-wired and pre-tested
before dispatch to allow for rapid set up,
the Combo has a capacity range of 50 to
500 tonnes and boasts a unique modular
design to combine feeding, grading,
washing, water recycling and stockpiling
onto one compact chassis. The Combo
technology is so efficient that the final
products are ready to be sold directly on
exiting the system.”
The result
The Ground Breakers’ bucket wheel
was not effectively reducing moisture in
the sand products and fines were lost
to ponds. To address these limitations,
the Combo’ high-frequency dewatering
screen dewaters the material in
one pass, removing the need for re-
processing and double handling. Once
the sand slurry with the silt material is
discharged from the hydrocyclones, it is
delivered to the screen which is sized
according to the customers’ specific
capacity requirements. This allows for
the production of a sand product with a
moisture content typically ranging from
10% to 15%. As a result, the product is
ready for market straight from the belts,
in turn converting sand into revenue in
the shortest possible time. An added
benefit of the Combo system is that
although the plant packs a powerful
punch, it only requires a very small
footprint, which makes it easy to relocate,
even in remote areas and urban settings.
Janse van Vuuren and Meintjes agree,
“Our CDE Combo is compact and highly
efficient. It produces two properly
washed products and our customers are
very happy that the moisture content is
so low. This means a considerable cost
saving to them, as generally we sell per
tonne.”
“Because the system works basically
as a full-circuit unit, retaining fines and
recycling used water for immediate
re-use in the system, the need for silt
dams has been significantly reduced and
we have been able to preserve valuable
mining areas.
“Switching from a bucket wheel
system to the Combo has been
conducive to considerable cost savings,
as generally we sell per tonne. The
additional -2mm product has many
uses, from plastering exterior walls to
making paving bricks. It has increased our
profitability considerably.
Du Ploy concludes, “The new Combo
on the Lanseria site has allowed the
company to maximise yield and reduce
its operational costs. The production of
sand and aggregates is guaranteed to
be within specifications, with no risk of
cross-contamination when two products
are processed simultaneously, and in
line with the requirements of customers
or their downstream processes.
“At CDE we put all our passion and
expertise in developing equipment
that is tailor-made for each client to the
highest quality standards. Return on
investment is fast thanks to reduced
requirements for spares, highly efficient
water management as well as longer
and more reliable running time.
“CDE’s products are specifically
designed to require minimum attention,
minimal civils and a minimal number
of operators thanks to its one-touch
technology, so that it can be left
to simply produce clean sand and
aggregates at the required rate.
“It was a pleasure to support Ground
Breakers in installing the next generation
of wet processing equipment to allow
the company to achieve the full potential
of its vision and its quarry site.”
Future of Sand Washing
Conference in Johannesburg
in collaboration with ASPASA
Date: Wednesday 31 July 2019
Location: Birchwood Hotel & OR
Tambo Conference Centre
Time: 9am to 5pm
Registration: To register, please visit
www.cdeglobal.com/africonf2019
www.plantonline.co.za