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Magnetic Separators-lipuMagnetic Separators

Magnetic Separator

LIPU magnetic separators are designed for mineral beneficiation, magnetic recovery, and iron removal applications. They can be used for wet or dry separation of magnetic and weakly magnetic materials in mining and industrial mineral processing.

Different separator types can be selected according to mineral characteristics, feed size, magnetic susceptibility, required capacity, and process conditions.

  • Applications: Iron ore beneficiation and iron removal from non-metallic minerals
  • Process Type: Wet and dry magnetic separation
  • Typical Materials: Magnetite, hematite, ilmenite, quartz, feldspar and other magnetic or weakly magnetic minerals

What Is a Magnetic Separator?

A magnetic separator is mineral processing equipment that separates materials according to differences in magnetic properties.

When material passes through a magnetic field, magnetic particles are attracted toward the magnetic system, while non-magnetic or weakly magnetic particles follow a different path.

Magnetic separation is commonly used for:

  • Recovering magnetic minerals
  • Removing iron impurities
  • Improving concentrate quality
  • Pre-concentrating ore before downstream processing
  • Purifying non-metallic minerals

The correct separator depends on the magnetic properties of the material and whether the process is wet or dry.

Magnetic Separator Types and Features

LIPU magnetic separators can be configured for different mineral processing and purification applications.

LIPU CTB7518 wet drum magnetic separator for magnetic mineral recovery and iron ore beneficiation
Wet Drum Magnetic Separator
Dry Magnetic Separator
Dry Magnetic Separator

Wet Drum Magnetic Separator

Wet drum magnetic separators process material in slurry form.

They are commonly used after grinding and classification for the recovery of strongly magnetic minerals such as magnetite.

Typical applications include:

  • Magnetite recovery
  • Iron ore beneficiation
  • Magnetic mineral concentration
  • Recovery of magnetic material from slurry
  • Removal of magnetic impurities from wet material

The drum rotates through the slurry while the internal magnetic system attracts magnetic particles to the drum surface. Magnetic material is carried to the discharge area, while non-magnetic material leaves through a separate path.

Dry Magnetic Separator

Dry magnetic separators process material without adding water.

They can be used where water is limited or where the material should remain dry.

Typical applications include:

  • Dry ore pre-concentration
  • Iron removal from industrial minerals
  • Quartz and feldspar purification
  • Heavy mineral separation
  • Treatment of dry granular materials

Dry separation performance depends strongly on feed size, moisture, material distribution, and magnetic field intensity.

Materials and Applications

LIPU magnetic separators can be used for a range of metallic ores and industrial minerals.

Magnetic separator materials and applications including magnetite hematite ilmenite manganese ore quartz and feldspar
Typical materials for magnetic separation and iron removal applications

Typical materials include:

  • Magnetite
  • Hematite
  • Limonite
  • Ilmenite
  • Manganese ore
  • Iron-bearing minerals
  • Quartz
  • Feldspar
  • Silica minerals
  • Beach sand and heavy minerals

Typical applications include:

  • Iron ore beneficiation
  • Magnetite concentration
  • Iron removal from quartz
  • Feldspar purification
  • Ilmenite separation
  • Manganese ore processing
  • Heavy mineral processing
  • Mineral pre-concentration

The required magnetic field intensity and separator configuration depend on the magnetic susceptibility of the target mineral and the material to be rejected.

How Does a Magnetic Separator Work?

Material enters the magnetic separation zone and passes through a controlled magnetic field.

Magnetic particles are attracted by the magnetic system, while non-magnetic particles are less affected and follow a different discharge path.

Working Principle of Magnetic Separators

In a wet drum magnetic separator, slurry enters the separation tank and contacts the rotating drum.

The internal magnetic system attracts magnetic particles to the drum surface. As the drum rotates, the magnetic material is carried away from the feed zone and discharged separately.

Non-magnetic material remains in the slurry and exits through the tailings side.

In dry magnetic separation, material is fed in a dry and controlled layer. Magnetic and non-magnetic particles are separated according to their response to the magnetic field.

Main Magnetic Separator Components

A typical wet drum magnetic separator includes:

Main Magnetic Separator Components
  • Magnetic system
  • Rotating drum
  • Separation tank
  • Feed box
  • Discharge chute
  • Flushing or washing pipe
  • Drive system
  • Support structure

The magnetic system provides the separation force, while the rotating drum transports attracted magnetic particles toward the discharge area.

The exact structure varies according to separator type and application.

Wet vs Dry Magnetic Separation

Wet and dry magnetic separation are used under different process conditions.

FactorWet Magnetic SeparationDry Magnetic Separation
Feed conditionSlurryDry material
Typical particle conditionFine or ground materialDry granular material
Water requirementRequires process waterNo process water required
Common applicationMineral beneficiationPre-concentration and purification
Typical useMagnetite recovery and wet circuitsIron removal and dry mineral processing

Wet magnetic separation is often used after grinding and classification in mineral processing plants.

Dry magnetic separation can be useful before grinding, in dry pre-concentration, or in industrial mineral purification where water is not desirable.

The final choice should be based on mineral characteristics, feed size, moisture, process requirements, and water availability.

Magnetic Separation Process

A magnetic separator normally works as part of a complete mineral processing system.

A typical wet magnetic separation process may be arranged as:

Magnetic Separation Process
Magnetic Separation Process

Crushing → Grinding → Classification → Magnetic Separation → Concentrate Dewatering

For example:

Jaw Crusher → Ball Mill → Spiral Classifier or Hydrocyclone → Magnetic Separator → Thickening → Filtration

For dry pre-concentration, the process may be simpler:

Crushing → Screening → Dry Magnetic Separation

The actual process depends on mineral type, liberation size, magnetic properties, required concentrate quality, and final product requirements.

For some ores, magnetic separation may also be combined with flotation, gravity separation, or other beneficiation methods.

Magnetic Separator Technical Parameters

Magnetic separator selection depends on drum size, magnetic field intensity, feed size, processing capacity, mineral characteristics, and operating conditions.

Magnetic Separator

Model Shell diameter(mm) Shell length(mm) Shell rotationspeed(r/min) Feeding size(mm) Processing capacity(t/h) Power(kw)
CTB6012 600 1200 <35 2-0 10-20 1.5
CTB6018 600 1800 <35 2-0 15-30 2.2
CTB7518 750 1800 <35 2-0 20-45 2.2
CTB9018 900 1800 <35 3-0 40-60 3
CTB9021 900 2100 <35 3-0 45-60 3
CTB9024 900 2400 <28 3-0 45-70 4
CTB1018 1050 1800 <20 3-0 50-75 5.5
CTB1021 1050 2100 <20 3-0 50-100 5.5
CTB1024 1050 2400 <20 3-0 60-120 5.5
CTB1218 1200 1800 <18 3-0 80-140 5.5
CTB1224 1200 2400 <18 3-0 85-180 7.5
CTB1230 1200 3000 <18 3-0 100-180 7.5
CTB1530 1500 3000 <14 3-0 170-280 11

Actual processing capacity may vary according to feed size, pulp concentration, mineral properties, and separation requirements. The technical parameters should therefore be used for preliminary model selection.

How to Select the Right Magnetic Separator

Selecting a magnetic separator should begin with the magnetic properties of the material rather than capacity alone.

For preliminary equipment selection, please provide:

  • Material or ore type
  • Mineral composition
  • Magnetic properties
  • Maximum feed size
  • Required processing capacity
  • Wet or dry process
  • Target concentrate or impurity-removal requirement
  • Required separation result
  • Ore test or mineral analysis, if available
  • Project location

Important selection factors include:

Mineral Magnetic Properties

Strongly magnetic minerals and weakly magnetic minerals may require different magnetic field strengths and separator configurations.

Feed Size

Particle size affects both mineral liberation and separation performance. The feed should match the selected separator and process stage.

Wet or Dry Process

Wet separators are suitable for slurry-based beneficiation circuits, while dry separators are more suitable for dry feed, pre-concentration, or mineral purification.

Magnetic Field Intensity

Different minerals respond differently to magnetic fields. The required magnetic intensity should be matched to the target mineral.

Required Product Quality

Separator selection also depends on whether the objective is concentrate recovery, impurity removal, pre-concentration, or product purification.

Whenever possible, mineral analysis or separation test data should be used to support equipment selection.

Why Choose LIPU?

LIPU Heavy Industry provides equipment for crushing, grinding, classification, magnetic separation, flotation, gravity separation, thickening, and dewatering.

Wet drum magnetic separator operating at an iron ore beneficiation customer site
Wet magnetic drum separators
Dry magnetic separation equipment operating at an outdoor mineral processing customer site
Dry magnetic separation equipment
Iron ore magnetic separation customer site with multiple drum magnetic separators in operation
Iron ore beneficiation site with multiple magnetic separators operating in the processing line

For magnetic separation projects, LIPU can assist with:

  • Magnetic separator model selection
  • Wet or dry process configuration
  • Grinding and classification equipment matching
  • Magnetic separation circuit arrangement
  • Equipment manufacturing
  • Factory inspection and testing
  • Installation and commissioning support
  • Spare parts and technical service

For complete beneficiation projects, magnetic separators can be matched with upstream crushing and grinding equipment as well as downstream concentrate handling equipment.

The objective is to select the separator according to the complete mineral processing flow rather than treating it as an isolated machine.

Frequently Asked Questions

What minerals can be processed by a magnetic separator?

Magnetic separators are commonly used for magnetite, hematite, limonite, ilmenite, manganese minerals, iron-bearing ores, and iron removal from quartz, feldspar, and other industrial minerals.

What is the difference between wet and dry magnetic separation?

Wet magnetic separation processes material in slurry form and is commonly used in beneficiation circuits. Dry magnetic separation treats dry material and is often used for pre-concentration or impurity removal.

Can a magnetic separator process weakly magnetic minerals?

Yes, but weakly magnetic minerals generally require a suitable high-intensity magnetic separation configuration. The correct equipment should be selected according to mineral magnetic susceptibility and test results.

What information is needed to select a magnetic separator?

Useful information includes material type, mineral composition, magnetic properties, feed size, capacity, wet or dry process, and the required separation result.

Can LIPU provide a complete magnetic separation line?

Yes. LIPU can provide equipment matching for crushing, grinding, classification, magnetic separation, thickening, filtration, and related mineral processing stages.

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