DORR-OLIVER EIMCO COMPANYA

Improving Productivity Through Technology

The revolutionary E-CAT™ Clarifier-Thickener combinesoptimized flocculation, high-rate clarification and high-density thickening in a single compact unit. It streamlinesliquid-solid separation process by optimizing use of chemi-cal settling aids and providing a dedicated escape route fordisplaced free liquid. Even more impressive, the E-CAT™System accomplishes all of this with no moving parts.

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EIMCO Invokes the First, Second, and Third Rules of EngineeringEfficiency: Simplify, Simplify, Simplify

Leach FeedGold TailsCCD CircuitsCopper ConcentrateCyclone OverflowCopper TailsPotable Water ClarificationUranium SlimesCoal Preparation PlantsCoal FinesWastewater ClarificationSteel Mill ScaleCarbon Recovery (Gold)Titanium DioxidePlatinumIron OreKimberlite

The E-CAT ™ Clarifier-Thickenerhas Proven Effective in:

The E-CAT ™ Clarifier-Thickener is theSimple Solution to Reducing the Size andCosts of Liquid-Solid Separation Processes.

E-CAT™ Design Features Operating AdvantagesNo moving parts Lower capital cost

Lower energy consumptionLess maintenance

Smaller surface area Lower capital costthan conventional Smaller footprintthickeners

Self-diluting feed Optimal flocculant utilizationNo external dilution pumps required

Good overflow clarity Effluent re-use in plant

Dense underflow Lower energy requirement for dryingLess area required for disposal pondReduced handling volume

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Outside, the E-CAT™ Clarifier-

Thickener features a deep cylindrical

tank equipped with a steep-sided

bottom cone. Inside, annular rows

of clarifying cylinders and a deep

feedwell surround a central recycle

column and dewatering cones that

rise from the compaction zone to the

feedwell. No raking mechanism is

required to stir or discharge settled

solids for most applications. An

optional raked E-CAT™ unit is

available for very difficult service

applications such as mineral sands

and high clay contents.

Putting it All Together: An E-CAT ™ Walk-through

Suspension

Overflow

Feed/Mixing Well

DewateringPipe

Flocs

ClarifyingCylinders

DewateringCone

Sludge Outlet

Efficiency in Action:The E-Cat™ Operating ProcessSlurry entering the E-CAT™ unit

is piped to the feedwell where it is

contacted with flocculent and clari-

fied liquor from the liquid recycle

Sizes and DimensionsDiameter Total Height

M M Max Min2 7.73 5 3

2.5 8.17 8 5

3 8.60 10 6

3.5 9.03 12 8

4 9.46 14 10

5 10.33 35 20

6 10.97 42 24

7 12.06 54 30

8 13.15 90 66

10 14.86 108 78

11 15.34 126 90

12 16.43 180 102

column. Influent turbulence provides

ample mixing energy for feed dilu-

tion and flocculation. Solid particles

agglomerate rapidly and begin set-

tling toward the sludge cone. Here,

the weight of accumulated solids

concentrated in a deep, narrow cone

provides maximum gravity compres-

sion and dewatering. Free water

displaced from the solids bed

escapes via the dewatering cones,

enters the recycle column and is

returned to the feedwell for influent

dilution. The remaining liquor is

channeled through the clarifying

cylinders. Once in the cylinders,

fine solids suspended in the upflow

collide and agglomerate, gaining

sufficient weight to settle against the

upward liquid velocity. This solids-

contact polishing action allows

E-CAT™ Clarifier-Thickeners to

achieve low overflow effluent turbid-

ities while consistently discharging

dense, high-quality underflow.

Internal Cylinders Qty.

Clarified Liquid ZoneFlocculant

Inlet

Free Settling Zone

Hindered Settling Zone

Compaction Zone

DORR-OLIVER EIMCO© Copyright 2003 GL&V. Form #KW-038-0102 / EMC 3273. Printed in U.S.A.

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