precoate filtration equipment

7/30/2019 Precoate filtration equipment

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EIMCO Precoat Filters

or Clarication/Polishing


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The EIMCO Precoat Filter is a

continuous rotary vacuum drum type

clarication or polishing lter available

in high and low submergence

conguration. It is applied or

clarication o dicult ltering, low

solids slurries on a continuous basis.

Precoat ltration is accomplished

through a pre-deposited bed o

diatomaceous earth or similar

material. The slurry solids deposited

on the surace o this bed during

vacuum operation are removed each

revolution exposing a resh surace

which maintains the ltration rate.

Our engineers are available to assist in

determining the easibility o applying

precoat ltration to your process. All

ndings are kept condential.

Precoat Filters CommonApplications

Clarication o ruit juices in ood

processing

Separation o juice and lees in

wine production

Purication o base streams in

pharmaceutical manuacture

Removal o oil rom slop streams

in rening operations

Recovery o liquids rom brewery

wastes

Polishing applications in metallur-

gical processing

Treating industrial wastes and

waste water clarication

Corn syrup clarication

Pregnant liquor clarication prior

to solvent extraction

Polishing plasticizers rom

solvents

Filtration and purication o

tetracycline broths

Removal o ats, oils, protein, and

unconverted starch rom

neutralized sugar liquor

Plating waste treatment

Dextrose clarication

Lube oil polishing


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Operating Principles

EIMCO Precoat Filters operate similar

to other continuous rotary vacuum

drum lters, but instead o drawing

the liquid through a lter cloth, the

fow is through a predeposited bed o

coating material. The bed o precoat

material traps coarse, ne, or

coagulated colloidal solids that

normally cannot be captured by

typical lter medias.

Beore going on stream, the drum is

covered with a material such as

diatomaceous earth or similar material

that will orm a coating over the

entire drum to a thickness o our to

six inches. The tank then may be

drained o the residual precoating

slurry. In most operations, the process

fow is introduced directly, ultimately

displacing the precoating residual.

As vacuum is applied to the system,

the claried liquid passes through the

precoat, and solids are deposited on

the surace o the precoat. This

deposit is removed by a scraper blade

which covers the length o the drum

and eeds inward to shave o a

predetermined thickness o precoat

on each revolution.

The depth o cut can be regulated as

desired by the operator and is

determined by the amount o cake

and precoat that must be removed to

leave a clean precoat surace or the

beginning o the ltration cycle.

The knie can be quickly adjusted

through use o individual high speed

advance and retraction motors. The

scraper advance is independent o the

drum drive.

Precoating time varies with the

thickness applied, typically 1/2-2

hours. Operating cycle time on one

precoating depends entirely on the

speed o the lter and the thickness

o the cut.


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Engineering Facts

Worm Gear Drive

The worm gear drive on the lter

assures continuous constant speed

rotation. Worm gears are cast iron or

bronze, and the worm hardened steel.

Trunnions rotate in lubricated bearings

with replaceable liners.

Valve Assembly

Rotary outlet(valveless) design isstandard. Two-solution outlet

Hy-Flow design is also available.

Drum

EIMCO Precoat Filters are

manuactured to extracting standards.

Drums are abricated on the latest

types o production equipment and

machined components are produced

on computer-controlled automatic

equipment. Internal support rings,

which stien the drum, are machinedto enhance the trueness o drum

rotation, making it possible to achieve

more complete use o the precoat

material. This is especially important

and can provide considerable cost

savings on large diameter lters

Agitator

Operating near the bottom o the

tank, the agitator provides complete

agitation throughout the entire tank,

including the discharge side where

pick-up on the lter drum starts.

Rakes on the agitator are positioned

with a 90-degree downward angle.

Assembly o the agitator pivot hub

uses a bearing and steel shat to

provide long wear and to eliminate

rocking action. The agitator is driven

through a shat mounted gear

reducer. Various mounting and drive

arrangements are available to suit the

installation requirements. Drive guards

are installed to provide operator

saety and meet OSHA guidelines

Scraper Mechanism

Precoat scraper advance mechanismensures stability and uniorm,

accurate, stepless removal o spent

precoating material and lter solids.

Apron and support assembly positively

eliminate blade chatter and

unnecessary production loss.


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Technical Data

Theoretical fow rates or various

grades o precoat materials are shown

in the chart to the right. Rates are

based on solids-ree liquid passing

through a rm 1-3/4 thick precoat bed

at 50% submergence with a pressure

drop o 20 Hg vacuum.

Precoat grades range rom a ne grade,

having a relative fow number o 100,

to coarser grades.


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www.fsmidth.com

FLSmidth is here to help you with all

your solid/liquid separation needs. For

a complete listing o our worldwide

locations and regional phone numbers,

visit www.fsmidth.com

Copyright 2010 FLSmidth A/S. ALL RIGHTS RESERVED. FLSmidth is a (registered) trademark of FLSmidth A/S. This brochure makes no offers, representations or

warranties (express or implied), and information and data contained in this brochure are for general reference only and may change at any time.

Minerals Processing

Technology Center

FLSmidth Salt Lake City, Inc.

7158 S. FLSmidth Drive

Midvale, UT 84047-5559

USA

Tel: 801 871 7000

Fax: 801 871 7001

Email: [email protected]

Chemical & Industrial

Technology Center

FLSmidth Wiesbaden GmbH

Am Klingenweg 4a

D-65396 Wallu

GERMANY

Tel: +49 - (0) -6123-975-300

Title EIMCO Precoat Filters

or Clarication/Polishing

precoate filtration equipment

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