What is Magnetic Separation?

The magnetic separation is actually based on differing degrees of attraction that is exerted on the various minerals by strong and powerful magnetic fields. Strongly magnetic minerals like franklinite, pyrrhotite, and magnetite can be easily removed from the gangue minerals with very good results with the help of low-intensity magnetic roller separators. But the oxide iron ores like siderite and limonite and the iron-bearing titanium, manganese, and the tungsten ores as well as iron-bearing silicates can only be separated by the high-intensity magnetic roller separators.

What is a magnetic roller separator?

A device in which the strong magnetic field is employed for removing the magnetic materials from concentrate ore, feed, or for selectively removing or separating the constituent minerals.

Basic Construction

The magnetic roller separators consist of the hopper, drive motor, adjustable splitter plates, roller construction, control panel, electromagnet feeder with the dimmer control.

The rare earth separators have a powerful and strong rare earth magnetic roller, that also function as the head pulley. When the product on belt passes over rare earth magnet roller, the ferrous particles get stick to the belt and ferrous particles fall freely just off the belt into non-magnetic chute because of centrifugal force. Magnetic roller separator is designed for the separation of the para-magnetic or micro iron material from the ceramic raw material and also from the minerals.

Magnetic Roll Separator

There are five major magnetic separation component types

  • Plate magnets
  • Magnetic traps
  • Magnetic grades
  • Magnetic pulleys
  • Magnetic drums

Types of the magnetic roll separators

  • Edison Separator
  • Magnetic Coolant Separator
  • Wet Drum Separator
  • Gravity Feed Magnetic Separator

The Double Roller Separators

For highest purity purposes, double stage roller separators are designed. material passes through magnet for twice from the high intensity roller. The high intensity roller separators are manufactured for the extreme fine quality separation and these separators have been used by the industries in the industrial mineral applications successfully. These magnetic roller separators have the rare earth neodymium permanent magnets.

Triple and the multi roller separators

Triple and the multi roller separators are produced for the purification of material and it separates the iron particles very finely and smoothly. The material that is to be cleaned is passed from the magnet of multi stage roller and then it is provided at the material outlet. Material flows in hopper and then it comes on the vibrator. the product flow is diverted, it then falls across the surface at the roller belt, the ferrous matter that is contained in product flow is then drawn to roll’s surface by powerful and the strong magnet housed inside.

Dust Tight Magnetic Roller Separators

Dust tight magnetic roller separators are also manufactured in China in one to eight stages roller separator in various sizes. These magnetic roller separators can even separate the weekly magnetic contamination.

High Intensity Magnetic Roller Separators

In high intensity, magnetic roll separator, short conveyor belt envelops a magnetic roll and the tensioning ideal roll. suitable feeder discharges or excretes materials on the belt. Paramagnetic and the ferromagnetic particles adhere to a belt and the nonmagnetic particles flows freely off at end of a conveyor.

The high intensity magnetic roller separators are used in the processing and the cleaning of various grains:

  • These separators are used in rice cleaning.
  • Used in the very fine wheat cleaning.
  • Efficiently cleans the corn.
  • Also being used in the pulses cleaning.
  • Cleans the sesame very sharply.
  • Used in cumin cleaning.
  • Also used in the fennel seed cleaning.

Industrial Uses of the Magnetic Roller Separators

The magnetic roll separators are mainly and specifically used for the separation or cencentration  of the minerals or of the materials having low magnetic susceptibility.

Other uses include extraction of the chromium or iron bearing minerals from the silica sand, concentration minerals like the wolframite, removal of the paramagnetic minerals like the Iron Titanium Oxide and Iron Carbonate etc., from the valuable non-magnetic minerals and the purification of the abrasives and dry granular chemical compounds.

These self-cleaning and the magnetic roll separators selectively remove the magnetic components out of the conveyed material and then discharges as clean and distinct material.

For selective recovery, the field intensity is quite adjustable.

Extremely high gauss of 20,000 power is achieved by magnetic roller separator.


  • Refractory and abrasive.
  • Magnetite beneficiation.
  • Raw materials cleaning.
  • Iron ore beneficiation.
  • Glass sand and manganese beneficiation.
  • Pyrophyllite and andalusite beneficiation.
  • Diamond beneficiation.
  • Kainite and the diatomaceous earth cleaning.
  • Pre-concentration of copper-nickel ore.
  • Feldspar cleaning.
  • The Bauxite upgrading.
  • Removal of the Ferro silicates from the limestone magnetite etc.
  • Graphite and flint clay beneficiation.
  • The recovery of metals from the slag.
  • Ultra high quartz purity cleaning.
  • Ceramic raw materials cleaning.
  • The selective separation of the rutile/ zircon / ilmenite and garnet recovery.
  • Bauxite cleaning.
  • Advantages of the magnetic roller separation
  • It lower the installation costs.
  • Easy access to the dust generation points.
  • Reduced periodic cleaning and the downtime.
  • Ready observation of operation and the ease of process control.
  • It lower the maintenance costs.
  • It lower the capital costs and the operating costs at per tones of the product.
  • Latest emf- Chinese factories incorporates the special new designs of the operational and the development experience.

Why these magnetic separators are used in the industries?

  • The magnetic separators are used for protecting the vital process equipments downstream from damaging while it produces the clean separated final product.
  • Such type of equipment includes the primary jaw crushers, hammer mills, cone crushers and other tertiary crushers.
  • It can also effectively and efficiently prevent the long sharp metal shards against ripping, cutting or tearing conveyor belts.
  • These are usually and mostly used for the separation of tramp iron, that is also known as the unwanted or the damaged metal and the ferrous impurities, from the nonmagnetic materials that are conveyed in the bulk form.
  • Ferrous impurities originates from the land fill or the excavating machinery that are used to mine, drill or recovering the raw material or extracting.