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DWS series, Wet Drum Magnet Separators, are widely used in the mining and mineral industries for heavy media recovery and iron Ore concentration. A separator basically consist of magnetic drum, tank, feed and discharge chutes, drive and supporting frame, which for erection and maintenance, the tank is easily dismantled. The drum comprises 120-140 degree magnetic arc assembled inside of wear resistance stainless steel shell. The drum magnetic arc is inhabited by aluminum alloy caps. The drum shell and caps rotate with specific rate around the fixed magnetic arc. This drum is housed in a complementary tank with slurry flow paths that explore the minerals to the magnetic field. The slurry feed is introduced to the separator through feed box that distributes the feed uniformly across the drum width. Magnetic particles are pulled against the drum surface and move with until they are outside of the magnetic field and carry out to the final discharge point. DWS wet drum magnets can be assembled by ceramic magnet (LIMS) and Neodymium magnet (MIMS), which has definitely created variant magnetic force accompanied by difference intensity and gradient.The MAG-Magnetics line of wet low intensity drum magnetic separators (LIMS) is used for the recovery of ferromagnetic materials from non-magnetic materials. LIMS are effective in a primary application with high efficiency, high concentrate and a tolerance for high levels of non-magnetics loading. They are equally effective in cleaning and finishing steps for upgrading of magnetic materials to final quality. Wet medium intensity drum magnetic separators (MIMS) are used for recovery of weakly ferromagnetic material and they are effective for primary and secondary application and especially for scavenger application in tail line of the LIMS separators. The magnetic separation process is complex in many respects due to the varying magnetic susceptibility of the different ores, the amount of middlings, and the particle size distribution of the processed ore.

The magnetic force acting on a specific particle is dependent upon these factors as well as other properties such as magnetic flux and magnetic field gradient, which are created by the magnetic system in the separator. The product of field time's gradient, also called the magnetic force index, varies between different magnetic system designs and is a factor when selecting the most suitable magnetic system for a particular process.As in all applications, the magnetic force is competing with other forces such as gravity and hydraulic drag; therefore, the feed volume and tonnage must be balanced to obtain a suitable level of performance.Generally speaking, the smaller the particle size that is being processed results in a lower feed capacity of the equipment. By selecting a higher magnetic field strength (magnetic flux) the feed capacity can be increased considerably, in many cases the recovery of the fines increases significantly with the field strength.It is important to note that drum speed, tank configuration, magnet element type and pole arrangement play key roles in separation efficiency. The MAG-Magnetics wet drums are supplied in counter rotation, concurrent and counter current configurations. Magnetic field strength range for LIMS drum is from 800 to 1600 Gauss and for the MIMS drums the range is between 2500 to 3000 Gauss. The most suitable strength and configuration is determined for each customer through lab test procedure.

ApplicationsMagnetite ore upgrading Dense media recoveryRemoval of magnetic iron particles from non-ferrous materials

Sep 2013

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CC - ConcurrentThe concurrent style of magnetic separator features:Feed box in special design for even distribution of the feed slurry.Feed entry section to improve on feed pulp distribution thus ensuring full width feed to drum;Short pick -up zone, which reduces the risk of coarse material settling on tank bottom. Tank bottom plug to allow coarse material to discharge trouble free;

Suited for processing of coarse ore up to 6 - 8 mm (3 mesh) and, with special arrangement, up to 15 mm. The pulp density recommended for this type of tank is 30 to 50 percent solids by weight.

CR – Counter-rotationThe counter-rotation style of magnetic separator features Feed box with feed tubes; Feed entry section to improve on feed pulp distribution thus ensuring full width feed to drum; Long pick up zone; Adjustable (manual) overflow discharge of the effluent for pulp level control allowing surges in feed flow; Feed tubes are wear protected on the outside by molded polyurethane and on the inside by polyurethane inserts;

The CR tank is suited for processing medium coarse ore up to 3-8 mm (4 mesh) at medium to high densities (30 to 50% solids).

CTC - CountercurrentThe countercurrent style of magnetic separator features: Feed box in special design for even distribution of the feed; Feed entry section to improve on feed pulp distribution with full width feed to drum; Medium long pick-up zone; Full-width effluent overflow weir for pulp level control;

The CTC tank design is suited for processing fine to medium-sized ore up to 0.8 mm (20 mesh). The pulp density range recommended for this type of tank is 25 to 45 percent solids by weight.

Benefits Excellent separation and recovery of ferromagnetic materialsVariety of magnet strengths available to suit different applicationsAvailable with counter rotation, counter current and concurrent tank designs to achieve best performance

Robust design to provide reliable operation Tank construction 304 stainless steel Vertical and lateral adjustment of drum

CC

CTC

CR

Sep 2013

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Higher recovery and efficiency Optimal cleaning in finishing treatment High iron particles selectivity

Pre-selection notesFive basic factors influence proper selection of a magnetic separator in terms of drum diameter, magnetic width, and type of wet drum separator for use in a specific application. These are:

Volume of rinse slurry to be handled. Percent of solids in rinse slurry. Percent of magnetics in the feed solids of the rinse

slurry. Required magnetic recovery efficiency. Cleanliness required in the magnetic concentrate

product.

Sep 2013

Model Drum

Diameter

Drum effective Length.

Drive Weight Approx.

Dimension

mm mm kw kg

DWS 90/30

916

300 1.5 1,250

DWS 90/60 600 2.2 1,530

DWS 90/90

900

2.2

1,850

DWS 90/120

1,200

2.2

2,270

DWS 90/150

1,500

2.2

2,640

DWS 90/180

1,800

4

2,920

DWS 90/240

2,400

5.5

3,830

DWS 90/300

3,000

7.5

4,560

DWS 120/60

1,200

600

4

2,150

DWS 120/90

900

4

2,640

DWS 120/120

1,200

5.5

2,980

DWS 120/150

1,500

5.5

3,390

DWS 120/180

1,800

7.5

3,820

DWS 120/240

2,400

7.5

5,150

DWS 120/300

3,000

7.5

5,940

W

mm1,385

1,7002,0002,3002,6003,0503,750

4,4501,8102,1002,4802,7803,1903,7904,390

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Sep 2013

DW

S 9

0 C

C

1764

1800

W

1800

W1785

1800

DW

S 9

0 C

RD

WS

90

CTC

1700W

DW

S 1

20

CC

2020

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Sep 2013

2100

W

2100

W2035

2100

DW

S 1

20

CR

DW

S 1

20

CTC

1890W