purpose built diagnostic tool for magnetic wet drum ... · of the drum purpose built diagnostic...

HERE’S WHAT THE RESULTS MEAN...

In this instance the irregular field pattern was due to the magnets having moved within the assembly. Other irregularities were due to faulty repair work, magnetite ingress covering the magnets and magnets damaged due to wear and tear while rubbing on the skin. All result in increased operating costs.

Purpose Built Test Equipment for Magnetic Wet Drum Separators (Patent Pending)

PURPOSE BUILT DIAGNOSTIC TOOL FOR MAGNETIC WET DRUM SEPARATORS

INTERNATIONAL MAGNETIC SOLUTIONS p: +61 2 4987 3912 • [email protected] • www.magneticmining.com.au

The IMS diagnostic procedure accurately measures the strength, direction and position of the alternating magnetic field pattern produced by the drum in 3 locations along the axis of the drum, at the Drive End, Centre and Non Drive end.

HERE’S HOW THE DIAGNOSTIC TOOL WORKS...

A series of accurate curves clearly showing the magnetic profile. If they have a standard even shape the magnets are in good working order. A distorted shape means there is a problem and the system is not operating efficiently.HERE ARE THE RESULTS...

INTERNATIONAL MAGNETIC SOLUTIONS TEST RESULT SHEET

Drum No 1233 Test No 1234

Company Coal CompanyDrum Description Primari 1 SepDrum Size D915x2800 mmDrum Make IMS

2011-06-23 12:53 Job No 234

Report on Results:Magnets readings indicate ingress of magnetite and movement of magnetsThe magnet location is good but the fields are weak and the system is in need of repair. It is suggested that the drum be taken out of service.IMS can repair the drum and reposition the magnet banks.

-2000

-1500

-1000

-500

0

500

1000

1500

2000

10 75 140

211

301

391

475

545

641

730

795

860

925

990

1055

1120

1185

1250

1315

1380

1445

1510

1575

1640

D Vert 3

D HOR 3

C Vert 2

C HOR 2

NDE Vert 3

NDE HOR 3

NDE Vert 4

NDE HOR 4

Mark


-2000

-1500

-1000

-500

0

500

1000

1500

2000

10 70 130

195

280

355

440

510

576

675

745

805

865

925

985

1045

1105

1165

1225

1285

1345

1405

1465

1525

1585

1645

D HOR 3

C HOR 2

NDE HOR 3

NDE HOR 4

Mark

-1500

-1000

-500

0

500

1000

1500

2000

10 70 130

195

280

355

440

510

576

675

745

805

865

925

985

1045

1105

1165

1225

1285

1345

1405

1465

1525

1585

1645

D Vert 3

C Vert 2

NDE Vert 3

NDE Vert 4

Mark


-2000

-1500

-1000

-500

0

500

1000

1500

2000

10 70 130

195

280

355

440

510

576

675

745

805

865

925

985

1045

1105

1165

1225

1285

1345

1405

1465

1525

1585

1645

D Vert 3

D HOR 3

Mark

-2000

-1500

-1000

-500

0

500

1000

1500

2000

10 70 130

195

280

355

440

510

576

675

745

805

865

925

985

1045

1105

1165

1225

1285

1345

1405

1465

1525

1585

1645

C Vert 2

C HOR 2

Mark

-1500

-1000

-500

0

500

1000

1500

2000

10 70 130

195

280

355

440

510

576

675

745

805

865

925

985

1045

1105

1165

1225

1285

1345

1405

1465

1525

1585

1645

NDE Vert 3

NDE HOR 3

Mark

DE Drive End C Centre NDE Non Drive End V Vertical Magnetic Field H Horizontal Magnetic Field

H

V

H

V

V

V V H

H

H

H

Drive Side

DE C NDE

300 300

Direction Readings taken

Magnet Bank

Drum

Magnet Bank

Drum

Vertical

Drive Side

Magnet Bank

Horizontal

DE Drive End C Centre NDE Non Drive End V Vertical magnetic FieldH Horizontal Magnetic Field

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-1000

-500

0

500

1000

1500

DE Vert 1

DE HOR 1

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-1000

-500

0

500

1000

1500

DE Vert 1 REP

DE HOR 1 REP

BEFORE REPAIR AFTER REPAIR

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- 1500

- 1000

- 500

0

500

1000

1500

2000

DE Vert 1

DE HOR 1

Mark5 75 145

215

285

355

425

495

565

635

705

775

845

915

985

1055

1125

1195

1265

1335

1405

1475

1545

1615

1685

Magnetic Field Strength Around Drum

Mag

netic

Fie

ld S

tren

gth

Gau

ss

Distance Around Drum Anti Clockwise From Drive Side

HERE ARE A COUPLE OF EXAMPLES OF WHAT WE FIND WHEN THERE ARE ANOMALIES IN THE MAGNETIC DIAGNOSTIC RESULT GRAPHS:

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0

500

1000

1500

2000

10 60 110

160

221

290

355

430

490

540

611

685

745

795

845

895

945

995

1045

1095

1145

Mag

netic

Fie

ld S

tren

gth

Gau

ss

Distance Around Drum in mmAnti Clockwise from Drive Side


D Vert 3 D HOR 3

NORTH POLE

SOUTH POLE

0

500

1000

1500

0 0 0 0 1 0 5 0 0 0 1 5 5 5 5 5 5 5 5 5 5eld

Stre

ngth

Gau

ss


D Vert 3

VERTICAL FIELD RADIATING OUT FROM THE DRUM

FIELD IN NORTH TO SOUTH POLE DIRECTION

-1500

-1000

-500

10 60 110

160

22 290

355

430

490

540

61 685

745

795

845

895

945

995

104 5

109 5

1145

Mag

netic

Fi e

Distance Around Drum in mmAnti Clockwise from Drive Side

FIELD IN SOUTH TO NORTH POLE DIRECTION

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-1500

-1000

-500

0

500

1000

1500

2000

10 60 110

160

221

290

355

430

490

540

611

685

745

795

845

895

945

995

1045

1095

1145

Mag

netic

Fie

ld S

tren

gth

Gau

ss

Distance Around Drum Anti Clockwise from Drive Side


D HOR 3

FIELD IN NORTH TO SOUTH POLE DIRECTION

FIELD IN SOUTH TO NORTH POLE DIRECTION

HORIZONTAL FIELD IN A PATH PARALLEL TO THE CIRCUMFERANCE OF THE DRUM

PURPOSE BUILT DIAGNOSTIC TOOL FOR MAGNETIC WET DRUM SEPARATORS

INTERNATIONAL MAGNETIC SOLUTIONS p: +61 2 4987 3912 • [email protected] • www.magneticmining.com.au

The magnetic field coming from the drum is made using a series of magnets inside the drum. These magnets are arranged in alternating North South pattern facing radially from the drum. This arrangement creates a magnetic field profile that may be described as having 2 major directional components. One component (the Vertical) is in a radial direction from the drum while the other component (the Horizontal) follows around the circumference of the drum. They both alternate varying in strength and North South direction around the circumference of the drum.

WHAT TESTING SHOWS:The IMS testing procedure accurately measures the strength and position of these alternating Field patterns in 3 locations along the axis of the drum. At the Drive End, Centre and Non Drive end.

The graphical results show how these fields vary in strength and polarity. The graphs shown here indicate the North Pole in red portion and the South Pole in Blue portion of the graph. The test results show the Vertical and Horizontal field patterns together and separately at each test position.

These field patterns directly influence the recovery efficiency of the drum. Any alteration to the magnetic field pattern will result in lower recovery and higher magnetite losses.

The IMS system is so precise and accurate that any alteration to the magnetic system will show an obvious distortion to the pattern on the graphs.

DRUM MAGNET CONSTRUCTION:

Broken Magnet Banks showing significant differences in magnetic profile

Covered Magnets

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-500

0

500

1000

Magnetite Covered

Crear Magnet

-1500

-1000

-500

0

500

1000

1500

Damaged Magnet Bank Profile

Normal Magnet Bank Profile

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-1000

-500

0

500

1000

1500

Damaged Magnet Bank Profile

Normal Magnet Bank Profile

You already know your plant is wasting Magnetite but you need to be absolutely sure that the drums are faulty before you commit to the significant expense of pulling them out of service.

The IMS test results will confirm if the condition of the Magnetic Wet Drum Separators are a contributing factor. The IMS test results will also give you the information you need to confidently decide whether you simply need to adjust them or go to the significant expense of pulling them out of service for repairs.

A basic test with a standard hand held probe will not give you the accurate repeatable information you need to make any decision with confidence.

Because the results from the IMS testing equipment and procedure are spot on accurate. If the results indicate an internal problem you can be sure it exists and that IMS can accurately interpret the results and advise if the drum should be pulled out for repair.

WHY USE THE IMS DIAGNOSTIC TOOL?

purpose built diagnostic tool for magnetic wet drum ... · of the drum purpose built diagnostic...

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