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In nearly all cases of mechanical liquid/solidsseparation, continuously operating centrifuges are thebest technical and economical proposition. They candewater large quantities of solids to low final moistures,whilst needing little space, energy and time. Thecorrect centrifuge will reduce the cost of thermal dryingconsiderably and may even make it superfluous.

TEMA - Siebtechnik Centrifuges ������� ���������������������������� ��������������������������

SIEBTECHNIK specialise in the development andmanufacture of continuously operating centrifuges.Our technical experts are at your disposal to adviseyou on the most suitable centrifuge. Machines areavailable for tests either on your premises or in ourtest establishment.

���������� ���� ������� �����The most versatile of our continuously operating centrifuges are worm/screen centrifugesin which the solids retained on the sieve are transported from the small to the largediameter through the angle of inclination of the basket and the slightly different speed ofthe scraper worm. With an angle of inclination of the basket adapted to the feed material,widely different products such as short fibre cotton linters, ice crystals from freezeconcentration or granular plastics, but especially salt crystals of diverse origin andconsistency are successfully separaten from the mother liquor and, where necessary,purified by washing. Depending on the operational conditions, the screen basket isprovided with perforated sheets or slot sieves.

������� ���� �����Decanter Centrifuges are used to separate very fine solids from liquids of lighter density.The solids form a sediment in the liquid, but are not retained by a screen as in a screeningcentrifuge.The speed of sedimentation can be increased by adding flocculents. In the solid bowlcentrifuge the sedimented solids are transported by the scroll to the smaller diameterand discharged, while the clear liquid flows over the adjustable weir at the cylindrical endof the machine. The screen decanter is a combination of a decanter and a screencentrifuge, which has a screen section to further reduce the final moisture. Materialpassing through the screen section can be recycled to the centrifuge feed.

��� ��� ����� �����The highest throughputs, up to 350t/h of solids, are attained with vibratory centrifuges inwhich the solids, which are retained by the sieve, are transported from the small to thelarge diameter by axial vibrations which exceed the rotary movement. Since this conveyingmechanism fails at high centrifugal forces, vibratory centrifuges are in the first placesuitable for processing mass products which can easily be dewatered to a relativelygood final moisture.

�������� ���� !�"�������#� ������ �����The TURBO-CASCADE isa special centrifuge which was developed for the dewateringof solids with a uniform particle size down to about 0.5 mm. The granules slide individually,not as a compact layer, over stepwise arranged screen segments.Baffle plates which rotate with the basket prevent them from jumping to another segment.In spite of the very short retention time of each individual particle in the centrifuge, finalmoistures down to 0.01 % are being attained.

$��#� ���� �����Pusher centrifuges are very robust, continuously operating machines, which in double-step execution offer highly reliable operation. The solids are retained, as a cake, by awedge wire basket and pushing motions in axial direction convey them to the dischargepoint. These centrifuges are employed when considerable wear can be expected andwhere an extremely low loss of solids in the filtrate and good washing are required.

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V2 z=r · g

V2

z= r · g

Centrifuging factor andretention time of theproduct are parametersaffecting the capacity ofthe centrifuge, whetherfor screening ordecanting machines.

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V2 nz = ≅ · r

r · g 30

Speed n = [min-1]

Diameter D = [m]

Radius r = D/2[m]

( )2

Diameter D = [m]

Sp

eed

n =

[min

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Cen

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z

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π r nv = [m/s]

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���� �%����The construction and working method of the ConturbexWorm/Screen Centrifuge is shown in the crosssectional drawing. Drive unit, bearings, rotating partsin the liquids chamber and the solids discharge areclearly visible and easily accessible for maintenance.The drive is by vee-belts and the speed of the rotatingparts is chosen to sult the process requirements. Acyclo gear unit ensures the necessary differentialspeed between worm and basket, even with a highfriction between the two. An overload protectionsystem prevents damage to the cyclo gear unit.Gearbox and bearings have a pressurised lubricationsystem, with the exception of the H 200 which has aoil filled gearbox.Machine and drive motor are mounted on a base frameprovided with rubber feet which can be bolted to thesupport construction.Even our largest centrifuge can be installed withoutspecial foundations or balancing weights. The relati-ve movement of the worm, ensures even distributionof the solids on the screen, thus preventing unduevibration. No potentially unbalancing solids remain inthe worm when the machine is stopped.

&��� ��!�������� ������The contact parts are made from Austenitic Steel,special Bronze, Hastelloy, Nickel, Titanium or similardepending on the application. With abrasive materials,the vulnerable zones are protected by abrasionresistant materials.

%����!�'��������� Sealing of process chamber by means of:

- Gas Labyrinth- PTFE ring- Sliding ring seal

� Filtrate cyclone with or without the facilityto recycle gas into the solids chamber

� Collecting ring for concentrated discharge� Feed via screw conveyor� Separate wash water discharge

Further special executions on request.

CONTURBEX Worm/Screen Centrifuge H 1000

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For the Conturbex Worm/Screen Centrifuge these areeither cylindrical or conical with 20 or 10° inclinations.The worm which rotates with a differential speeddetermines the transport speed and the retention timeof the solids on the screen.

With conical rotating parts the movement of the solidsis helped by the inclination. This angle is determinedby the manufacturer and influenced by the processrequirements.

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This standard execution has provedexcellent with most products andproblems. The solids slide from thesmaller to the larger diameter aidedby the increasing centrifugal force,but without significant push fromthe worm.

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This angle is preferred when inten-sive washing on the screen isnecessary.

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Special execution for purposessuch as dewatering of ice crystalsand cellulose derivatives.

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We reserve the right to make changes which serve technical progress.1) The actual capacities depend on the properties of the material and theirseparation characteristics.

Type CONTURBEX H 200 H 250 H 320 H 350 H 400 H 450 H 520 H 600 H 700 H 1000

Feed capacity1) about m³/h 1.5 3.5 7.0 10 15 20 25 35 50 100

Drive motor about kW 3.0 5.5 7.5 11 15 22 30 37 55 90

Length mm 700 910 940 1150 1150 1150 1480 1560 2150 2600

Width mm 880 1050 1165 1500 1500 1500 1920 2000 2100 2700

Height mm 570 800 950 970 1150 1150 1470 1470 1650 2600

Weight kg 230 560 700 900 1000 1100 1800 2000 4000 8000

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9 Worm/Screen centrifuges type CONTURBEX H 1000 for dewatering KCL crystallisate

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Adipic Acid

AH-Salt

Amino Acetic Acid

Ammonium Persulphate

Ammonium Phosphate

Ammonium Sulphate

Ammonium Thiosulphate

Anthracene

Aspirin

Bisphenol

Borax

Calcium Formiate

Carboxy-Methylcellulose

Celluloid Wool

Cellulose Wool

Chocolates (broken)

Citric Acid

Coal Slurry

Coffee Freeze Concentrate

Coffee Grounds

Copper Sulphate

Cotton Linters

Crystal Soda

Date Stones

Dimethylterephthalate

= DMT from Methanol

Dipterex

Disodium Phosphate

Finely chopped onions

Fungal Mycel

Glacial Acetic Acid

Glauber Salt

Greaves

Gypsum

Hops frome

Methylene Chloride

Ion Exchange Resin

Ironsulphate Heptahydrate

Lactose

Manganese Sulphate

Methylcellulose

Monosodiumphosphate

Naphtionate

Nuts (broken)

Nylon Chips

Oxalic Acid

Patent Soda

Pearl Polymerisate

Pentaerythrite

Plastic Granules

Plexiglas Beads

Polyethylene

Polymethacrylate

Polystyrene

Polyvinylalcohol

Potash

Potash Alum

Potash Solvent Residue

Potassium Bicarbonate

Potassium Bichromate

Potassium chloride

Potassium Monochromate

Potassium Pensulphate

Potassium Phosphate

Potassium Sulphate

PVA

PVC

Pyrazolene

Rock Salt

Rubber Regenerate

Silver Nitrate

Sodium Acetate

Sodium Bisulphite

Sodium Carbonate

Sodium Chlorate

Sodium Chloride

Sodium Formiate

Sodium Gluconate

Sodium Metaborate

Sodium Nitrate

Sodium Nitre

Sodium Perborate

Sodium Phosphate

Sodium Sulphate

Sodium Sulphite

Sodium Tetraborate

Sodium Thiosulphate

Tartaric Acid

Tin Sulphate

Trisodium Phosphate

Vegetables

Vegetable Extracts

Zinc Sulphate

and many others

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2 Worm/Screen centrifuge type CONTURBEX H 600 for dewatering Ammonium Sulphate

TEMA Systems, Inc.7806 Redsky DriveCincinnati, Ohio 45249 - USAPhone 513.489.7811Fax 513.489.4817e-mail: sales@tema.netinternet: www.tema.net T

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circular motion screensdouble counterweight screensround screensjigsattrition machinesflotation cells

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individual units andcomplete installations forsample taking and preparationjaw crushersroller millshammer and hammer impact millsvibrating mills and ball millsrotary shredderstest grading machines

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scroll-screen centrifugespusher centrifugessliding discharge centrifugesvibratory centrifugesdecanter centrifuges