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Sorting
Centrifuges
Sorting Centrifuge
"ReCENT" – Sorting
Centrifuge "ConCENT"
Fields of Application
Simplified
it can be assumed that the centrifuge can be used as a substitute for following
technologies:
·
Float-sink-procedures
·
Hydro cyclones
·
Jiggers (à hydro jiggers, hydro concentrating table, hydro through washer)
·
Centrifuges - with
preceding fine grinding
The application
spectrum of the sorting centrifuge is for grain sizes the size of dust upto
approx. 120 mm edge length. The density of the “lighter” goods to be feed can
range from < 1 kg/dm³ up to > 3 kg/dm³, whereas the density (weight) of
the sorting medium with regards to the static as also dynamic burden of the
unit is virtually irrelevant.
Depending
on the density of the material to be sorted a throughput of 2.0 to 5.0 t per
hour can be reached with the smallest standard installation size. With a bigger
installation a throughput of up to 40 t per hour can be reached. With a
parallel operation in a hall under 400 m² over 350 tons of material per hour
can be sorted, which corresponds to an annual throughput (3-shift-operation) of
more than 3.000.000 ton.
Basic principals
The
density sorting in general and sorting centrifuges in particular are well known
techniques in the conventional wet-mechanical processing and recycling. Here
different densities of materials are used, to carry out the sorting physically.
It has to be distinguished between fluid-fluid-solid or solid-solid-fluid
sorting techniques.
Classical
procedures for density sorting are static float-sink-units, jiggers, hydro
cyclones or the modern sorting centrifuges. Technologically the sorting centrifuge
stands in competition with the first named units, the competitors have to be
examined in the field of sorting systems.
The professional separation
technology for plastic-recycling:
Applications:
Recycling of mixed plastics,
Oil/fat
contaminated plastics and metals,
PET-bottle recycling,
sevageslugde,
and each application for separating two
materials with a different density.
The sorting results are optimal under the following parameters:
·
The density difference of
the fractions to be separated is +/- .02 kg/dm³.
·
The grain fraction lies
between < 1 mm und 40 mm, this means dust and coarse grain.
·
The density of the
sorting medium (e. g. water) lies between the density of the fractions.
·
The suspension ratio
(sorting medium to fraction) is bigger than 1:40.
Working Principle:
The
centrifuge has a vertical working rotor with continuous output for heavy and
light fraction (Ø 1200 mm x 500 mm ),
Process Principles Centrifuge
Basis of the
procedure is the physical behaviour of solids with different densities in a
liquid. In conventional float-sink-basins the natural gravitational forces
often are not sufficient for a quick and safe separation of heavy and light
fractions (SF; LF). Through the rotation speed an accelerating force
respectively a centrifugal force builds up in the centrifuge, which exceeds the
gravitation force hundredfold. This force is ideally adjusted to the input
material as also to the used sorting medium and secures a quick and clean
sorting of the material at a stable operating process.
Process Plan and Data
The rotor (1)
accelerates to the desired rotational speed and the sorting liquid is added
through the input port (11 to start up). At the discharge jigs light fraction
(2) and heavy fraction (3) a continuous ventilation is built up by reducing the
number of revolutions of the stripping blade (4) the (brake motor). The process
stabilizes itself within seconds. The suspension (solid-solid-liquids-mixture)
is fed through the input port (5 sorting process) and cannons onto the driving
plate (6), which rotates with the same speed as the liquid column (7).
By entering into
the liquid column the solid waste mixture is swirled in the liquid. The light
solid particles are immediately washed to the surface (8), flow upwards to the
discharge light fraction (2) and then are washed out through an outlet pipe.
The heavy fraction penetrates into the water column, cannons onto the rotor
wall (9), due to the conical cut of the drum (as also gravitation) it is forced
downwards and is then wrenched to the discharge due to a difference in the flow
rate (suction). The heavy fraction gets washed out through the inner shaft
(10).
At the outlet there
are worm conveyors (with draining device, automatic drying) with which the
gravitational turbidity can be fed in a circuit.
The professional separation
technology for the bulk industry:
The working princip of "ConCENT" is similar
to "ReCENT ". The differences are just the size and drive
parameters.
Principal Use:
The
coal, iron and steel industry, as well as the mining and metallurgical industry
are regarded as future principal users of the centrifuge. In the area of
plastic recycling there are detailed disquisitions regarding the possible
fields of application, which cover complete work concepts.
Concrete
fields of application of the centrifuge technology in the coal, iron and steel
industry are:
Coal
preparation Large-size
material (10 mm < x < 120 [40] mm )
Fine grade sorting (
.5 mm < x < 10 mm)
Finest grade sorting (< .5 mm)
Bauxite
preparation Separation of the Al2O3
(after jaw- and hammer crusher
(with ~ 50 mm)
soil, earth and silicic acid during the refining (washing).
Other
ore’s and minerals in the region of up to < .1 mm like iron ore, tin ore
etc. fluor spar, barium, kaolin and various ores as also mineral sludges
Steel
production blast sludge
processing
Aluminum
production aluminum recycling
The
fields of application include the aspects of purity and volume reduction,
whereas from the total input value also an arbitrary grain size can be
processed as component flow, where high standards are expected in the quality
(purity) or loss in output.
Other
fields of application like oil sand, processing of mud (deep bore engineering),
sedimentation mud or retreat of landfills are momentarily not under discussion.
Holger Schoenebeck
** Roder 15A **D-19230 Moraas **Tel.: +49(0) 38 83 51 06 02 **Fax: +49(0) 38 83
51 01 48