INNOVATION
the Combo accepts feed from natural
sand or crushed rock reserves, turning
what is often considered as a waste by-
product into a product that adds value to
the business.
CDE’s cyclonic technology allows for
unrivalled cut point control. Fractions
are precisely separated in the system to
provide stockpiles with consistent, high
quality material that is dry enough to be
ready for market straight from the belts.
The modular concept of the washing
solution allows for the addition of screens
to match predicted requirements for
increased production – whether in terms of
quantity or diversity.
Dewatering screen technology
CDE’s patented dewatering screen
technology (Infinity D-Line) delivers
washed sand that is ready for market
straight from the belts, allowing
operators to turn products into revenue
as quickly as possible.
A bolted design to remove all weld
requirements in the construction of the
side walls prolongs the working life of the
screen. The design for which the patent
was granted allows for increased thickness
of the screen’s wide walls while reducing
weight. Additional strength and support
are provided where required, while weight
is removed where it is not required.
Infinity screens can generate the same
acceleration as conventional screens with
less weight, which results in a reduction
in power consumption and reduces
operational costs.
The focus on prolonging the working
life of the screen is evident through the
introduction of wear protection at every
impact and transfer point. An example of
this is a magnetic polyurethane wear plate
on the top of the screen shaft, which not
only protects the shaft but is quick and
easy to replace, ensuring productivity
targets are met.
Another design innovation within the
Infinity Range is the development of new
U-Span cast cross members which, in
combination with the construction of the
side walls, deliver higher specific stiffness
that prolong the working life of the screen.
The Infinity range utilises Rosta suspension
units which deliver 98% vibration isolation
ensuring protection for the supporting
structure and the most efficient transfer of
energy to the screening material.
Also, the use of GRP guards eliminates
nip points while ensuring that the guards
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can be removed quickly and re-fitted. This
minimises the time required for essential
plant maintenance and demonstrates the
focus on understanding how operators will
interact with the screen when it is on site.
Water recycling
Through tried-and-tested water recycling
technology, the Combo significantly
reduces water requirements by recycling
up to 90% of the water used in the
washing process.
Intensive or systematic use of settling
ponds can generate significant loss
of revenue for operators and it is not
uncommon for high value fines to remain
trapped at the bottom of ponds. The use
of ponds also requires the operator to
factor in extra space on site and expect
downtime while the material settles.
The process of water recycling may
seem simple in theory, but all water
thickeners are not equal. Optimal efficiency
depends on stringent attention to detail
when designing the water management
system that fits the exact requirements of
the customer.
The Combo allows customers almost
total independence of water supply and
requires a small supply of fresh water
compared with traditional systems which
require 10 to 15 times more water.
The AquaCycle, which is an integral
element of the Combo, allows for up to
90% of the used water to be recycled
using a system dedicated to the removal of
fine particles via flocculation and expulsion
of sediments, formed by precipitation,
into a settlement tank. Extra water is
added to the treated water via a CDE
AquaStore unit. This very limited amount
of extra water serves to compensate the
losses incurred due to residual moisture
in the sand and sediments. The water
is then sent immediately back towards
the process, which functions almost as a
closed system.
The integrated flocculation station
allows for precise dosing of the pre-mixed
flocculant for efficient settlement. A single
motor operates the rack arms of the
AquaCycle for optimal treatment of the
sediment prior to drainage.
By maximising the settlement of solids,
the water management system reduces
the quantity of flocculent required as
well as running costs and optimises the
efficiency of the plant. By recycling up to
90% of the process water for direct re-
use in the system, the need for settling
ponds is reduced; with the addition of a
filter press tailings management system,
this figure increases to 95%, removing the
need for settling ponds altogether.
The reality of a fast return on
investment becomes extremely tangible
when an AquaCycle thickener is added to a
washing operation.
Stockpiling
Integrated wing conveyors controlled by
hydraulic cylinders enable unrivalled control
of sand specifications as they allow for
the conveyor to move across the screen
to adjust the cut point or blend the sand
directly on the conveyor to obtain an in-
spec product. With this unique technology,
operators can produce high-quality
concrete and plaster sands at the same
time, with no risk of cross-contamination.
Plug-and-play
Pre-wired and pre-tested before dispatch, it
arrives on site ready to plug and play either
as a standalone plant or as part of a larger
turnkey solution and can start processing
material within days. With all essential
processes housed onto one compact
chassis, the Combo system operates as
one interconnected and pre-assembled unit
which incorporates an integrated control
panel with one single point of operation.
This one-touch technology is designed for
single-operator use and unrivalled ease-
of-access for routine maintenance with its
patented swivel access to the pump.
Compact, convenient and
practical
The Combo is easy to move to multiple
sites due to its small footprint and is well-
suited to urban sites due to its compact
nature. With the Combo, sand can also
be produced closer to where concrete
is required, resulting in significant cost
savings in the transport of aggregates.
In line with CDE’s ethos of ‘A New
World of Resource’, the Combo offers
a practical solution to the concerns of
operators who need to juggle the delivery
of high-quality construction sands versus
stringent legislative requirements aimed at
protecting the earth from further depletion
of its natural sand reserves.
Delivering unrivalled control of in-spec
washed products from a wide range of
feed materials, the Combo can be used
in the construction, C&D waste recycling,
industrial sands, mining and environmental
sectors.
SEPTEMBER 2019
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