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EQUIPMENT, SYSTEMS & PROCESS INNOVATION SINCE 1835

AGGREGATE PROCESSING DIVISION

Thickeners


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HIGH RATE THICKENERS

McLanahan is a leader in providing fines recovery and

water management solutions to the Aggregate and

Mining industries. McLanahan has designed a High Rate

Thickener with simplicity of concept but with specific

benefits for todays operators. Our Thickeners provide

a low operating cost answer to recovering immediately

re-usable process water; additionally, they reduce the

need for settling ponds minimizing environmental and

water consumption concerns.

High Rate Thickeners make use of polymers to help

agglomerate very fine particles into larger particles that

can settle much faster than the fine particles themselves.

All solids settle to the bottom of Thickeners and clean

water rises to the top so the solids settling rate must

always be greater than the clean water rise rate. Care

must be taken when sizing Thickeners to avoid selecting

a unit that will be too small. If the clean water rise rate

is too high, more polymer must be added to the solids to

overcome upward rising velocity.

The Ultra Clear Thickener

separates fine solids from

water so the water is

available for immediate

reuse in the wash plant.


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BENEFITS

Immediate availability of approximately 90%

of plant water for reuse in wash plant

Drastic reduction in slurry volume reporting

to waste ponds

Reduction in horsepower required to pump

fresh water

DESIGN FEATURES

Tank Design Thickener tanks can be supplied as

weld together or bolt together and with concrete or

steel bottoms. All McLanahan Thickener Tanks include an

overflow launder with adjustable weirs.

Planetary Gearbox - Provides

the proper speed reduction and

torque to drive the rakes.

Rakes Minimum drag rake arm design reduces the

amount of torque required to move the rakes through

the settled solids and minimizes the disturbance of the

already settled solids.

Feed Well The McLanahan feed well is oversized to

aid in the removal of air bubbles that may have formed

through potential turbulence in the feed. Air remova

promotes in the settling process.

Hydraulic Drive Drives the rakes and operates the

rake lift. This system provides very accurate rake torque

monitoring and allows the rakes to be operated in

forward and reverse.

PLC Controls Automate Thickener operation. This loca

panel is easy to read outdoors and provides screen

access from a remote location.


4/4Guards are recommended for safe operation of equipment. In some photos, safety guards may not be shown. TH

We Invite Your Inquiries.

WORLD HEADQUARTERS TENNESSEE OFFICE FLORIDA OFFICE AUSTRALIAN OFFICE

200 Wall Street 585 Airport Road 2920 Barneys Pump Place 8/9 Tonella Centre, 125 Bull Street

Hollidaysburg, PA 16648 USA Gallatin, TN 37066 USA Lakeland, FL 33813 USA Newcastle West, NSW 2302 Australia

Ph: 814-695-9807 Ph: 615-451-4440 Ph: 863-667-2090 Ph: +02 49 248 248

Fax: 814-695-6684 Fax: 615-451-4461 Fax: 863-667-0449 Fax: +02 4926 2514

E-mail: [email protected] E-mail: [email protected] E-mail: [email protected] E-mail: [email protected]

www.mclanahan.com

AGGREGATE PROCESSING DIVISION

Thickener Diameter Nominal Max Capacity (GPM)

20 ft. 1,000

30 ft. 2,000

36 ft. 3,00042 ft. 4,000

50 ft. 6,000

60 ft. 8,000

75 ft. 13,000

90 ft. 20,000

125 ft. 40,000

STANDARD SIZES & CAPACITIES

Thickeners are typically sized based on achieving

settling rates of 6-10 inches per minute, which

translates to a loading rate of 3 gpm of slurry feed per

square foot of tank surface area.

HOW THICKENERS WORK

Feed enters the velocitybreak box where excessenergy is removed from

the slurry prior to entering

the Thickener feed pipe.

Flocculant is added into

the feed pipe and mixeswith the solids, forming

larger agglomerations, that

will rapidly settle to the

bottom of the Thickener.

The feed well is oversizedallowing entrapped air,contained within the feed

slurry, to rise and dissipate

so it does not enter the

main settling zone within

the Thickener.

Flocculated solids settle to the bottom of theThickener, compacting in what is known as thecompression zone, creating a dense slurry.

The dense Thickener solids are raked to thethickeners underflow cone and are removed via aslurry pump through the underflow pipe. Underflow

slurry densities can vary based on the type of

material being processed, size distribution of solids

being settled, or other process factors but as a

general rule, range from 35-50% solids by weight.

Clean water rises to the top of the Thickener andoverflows a peripheral weir into a collection launder.Once collected in the overflow launder, clean waterexits through a single flanged outlet and can flow via

gravity to a water storage tank or clean water pond

for reuse.

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