● Permanent and Electromagnetic Separators 

● Electromagnetic Lifting Devices

MAGNETIC EQUIPMENTS FOR FERROUS ELEMENTS SEPARATION

To extract metals from inert in order to recover them by other processes:

• Iron ores mines
• Foundries
• Plants for treatment of steel mill slugs
• Plants for solid waste treatment

OVERBAND MAGNETIC SEPARATORS

 SEN - SM

These machines - called sometimes also overbelt Separators – consist essentially of a magnet (electro- or permanent one) around which a belt called extracting band turns. The machines featured by a permanent magnet are called model SM, by an electromagnet model SEN.
SM Separators are usually supplied as single unit ready to operate – after hanging up – just by switching their motor on, better by a contactor provided with thermal protection. The machine can be supplied on request provided with a hydraulic motor.

SEN Separators are usually supplied with an electric board for AC / DC conversion and command of the band motor. These commands can be accomplished by Local Control from the electric board or switched on Remote Control.

Also more complex electric boards can be supplied, with accessories as switches for band side movement control, revolution control, current relay, etc. Also simpler electric board are available, with transformer and rectifying bridge.

STATIC (ELECTRO) MAGNETIC SEPARATOR EP - SMP

The protection electromagnets EP and the permanent magnet plates (SMP) are static equipment for iron separation: their purpose is to extract iron particles from a flow of inert material holding it tightly till the operator carries out its detachment.

The permanent magnet plate SMP are made of a circuit in soft iron with low carbon tenor and a group of permanent magnets in Sr-ferrite. The lower plate face is made of 12% manganese antimagnetic and wear resistant steel.
The magnetic field geometry in plates SMP has normally 3 poles with a central core and two side ones. For a highest extraction yield, the inert material flow should be perpendicular to the 3 poles line.

Respect to the conveyor:
• dimension L must be crosswise
• dimension A must be lengthwise
• dimension S joint to dimension A gives the extracting force at distance H
In particular cases, plates SMP can be made of neodymium (Nd-Fe-B) permanent magnets.

Electromagnetic plates EP have same purpose and installation features as permanent magnet plates.
The difference lies there, that in EPs the magnetic field is generated by an internal electric coil. The electric power turns into magneto motive force which generates the magnetic flux.

The magnetic circuit is made of high permeability soft iron and the coil - fed by continuous current - of copper or aluminium with grade C insulation. An electric board is also supplied for magnet control. The lower electromagnet face is made of 12% Mn antimagnetic steel.

The electromagnetic (P) and permanent magnet (PM) pulleys are usually mounted as end rollers on conveyors.
Their aim is to hold ferromagnetic intrusions present in the process material and discharge them automatically in the point the conveyor leaves the roller on its return way (see fig. 1).

Magnetic pulleys can be singled mounted or coupled to other magnetic equipments. If, for instance, the inert material layer is thick, an overband separator with magnetic field downwards and a magnetic pulley with magnetic field upwards can be installed. These two complementary fields carry out then a true magnetic “washing” of the material flow (see fig. 2). Another possible application is represented in fig. 3, with a magnetic pulley coupled to a magnetic plate acting in a process of tumbling stones separation.

Magnetic pulleys can be dimensioned to have the same dimensions of the rollers they replace. The same applies to their shaft diameter in order to suit the driving system already foreseen.
Magneti pulleys are usually supplied without supports and bearings, but with machined shaft and UNI normalized key.

Magnetic drums are essentially made of a static magnetic circu

it and a not-magnetic rotating cylindrical housing. Their fundamental aim is to attract the ferrous intrusions in the inert material, hold them on the cylindrical housing surface. While inert material falls naturally, the intrusions are discharged only when the housing goes outside the influence of the static magnetic field.

Magnetic drums can have different poles layout depending on the material to be handled and on the installation. Most common poles layouts (over 95%) are:

• lengthwise: N and S poles alternate along the drum circumference
• crosswise: N and S poles alternate along the drum axis.

Other poles layouts are also possible for special applications.
The magnetic field can be generated by a direct current fed coil (TE drums), in this case the drum is provided with an electric control board. In TM drums, the magnetic field is generated by permanent magnets in ferrite, neodymium or in special case Alnico. The choice of the magnetic field depends on the material to be treated.
The installation can be in series (fig. 1), with process material from a vibrating chute.
Also the extracting installation can be carried out (fig. 2), in this case the material does not enter into contact with the magnetic drum.
An interesting application is shown in fig. 3: the magnetic drum is then set in a closed duct, with an inlet and two outlet flanges, one for cleaned material, one for ferrous pieces.
This machine, named CMTM, find good application for granular or pulverized materials, therefore in the food, plastic and sands industry.
The linked questionnaire, when filled out, will help us defining the correct system layout and sizing.

TUBULAR MAGNETIC FILTERS MF

The tubular magnetic filters MF (with permanent magnet) and EF (with electromagnet) are magnetic separators which, inserted vertically by the fall of granulose or pulverized material, attract and hold the contained ferrous parts leaving clean inert.
These filters are particularly suitable to stop accidental ferromagnetic intrusions, whose presence worsens the product quality or jeopardizes downstream machines.
The difficulty to quantify the intrusions amount respect to the hourly

output makes the use of the permanent magnet MF machine more advisable. This machine must be in fact periodically cleaned, easy operation by means of a turning door by which the magnetic core becomes easy to access. For installation site with difficult access, for instance a silos top, the electromagnetic version EF is available. This machine must be provided with a pneumatically operated deflecting valve (on request) in order to deviate the ferrous material from the vertical falling trajectory.

GAUSS MAGNETI circular electromagnets are suitable to be used for the following applications:

Very heavy work in:
• Steel mills
• Foundries
• Scrap crushing by means of steel balls
• Loading and unloading of rail containers
• Harbors
• Scrap yards

Cleaning work in:
• Scrap yards

Circular electromagnets can be hung both on crane bridges and on earth-moving vehicles and can be manufactured in high temperature as well as in waterproof version.

GAUSS MAGNETI rectangular electromagnets for billets and slabs are designed according to the customer’s requirements for in-plant handling. They are mainly used for the following applications:

• Production unloading (hot material up to 600°C)
• Loading and unloading of lorries, rail containers, ships.
• Stocking in store or warehouse

Due to their design these magnets are suitable to operate at high temperature. In fact the special thermal insulation and the double bottom plate hamper that the heat from the load reaches the coil assuring then the highest electromagnets reliability.
The particular coil design and the very low current density allow handling of billets and slabs at temperature up to 600°C.

The rectangular electromagnets by GAUSS MAGNETI for plates and packs are designed keeping into account the strong customers requirements for optimal managing of the available space in plant, for high movements speed and for possibility to handle one or more plates at the same time

They are mainly used for the following applications:

• Unloading of plates from production line (also hot materials till 600°C)
• Loading and unloading of lorries, rail containers, ships.
• Stocking in stores or warehouses
• Loading and unloading of cut plates

The careful study of the magnetic field lines allows handling single and multiple plates, depending on the operator’s need, granting also the highest efficiency and safety during transport.
Safety is achieved not only by using a high magnetic force, but also by a correct load arrangement under a sufficient magnets number, depending on the bending of the load itself.
Special versions for high temperature materials (up to 600°C) are also available.

GAUSS MAGNETI designs and manufactures special deep field

electromagnets for handling of 6 to 24 meters long ferrous bundles and packs. In design the magnet and beam weights are carefully calculated in order to use at best the lifting device capacity.

They are mainly used for the following applications:

• Unloading of wire rod, rolled, drawn and profiled parts, pipes (also hot materials)
• Loading and unloading of lorries, rail containers, ships.
• Stocking in stores or warehouses

The use of electromagnets makes the handling of these long materials more rational, with low requirement of personnel and greater safety, as the operators no longer have to approach the load neither to climb on it. No spacer between the bundles or the single product is any longer needed with consequent better exploitation of the available stock space.
The electromagnets are hung under a beam by means of chains allowing them to fit on the bundles irregularities. Depending on the need, the electromagnets are designed with more active polarities and then higher safety degree.

GAUSS MAGNETI designs and manufactures special deep field electromagnets, with two or more magnetic poles, for handling of 6 to 24 meters long ferrous single or packed beams and sections. Magnetic shoes shape and dimensions are designed in order to enter also thin beams wings. In the design the magnet and beam weights are carefully calculated in order to use at best the lifting device capacity.

They are mainly used for the following applications:

• Unloading of beams and sections from production line (also hot materials)
• Loading and unloading of lorries, rail containers, ships.
• Stocking in stores or warehouses

The use of magnets makes the handling of these long materials more rational, with low requirement of personnel and greater safety, as the operators no longer have to approach the load neither to climb on it. No spacer between the single product is any longer needed with consequent better exploitation of the available stock space.

GAUSS MAGNETI designs and manufactures special electromagnets devoted to handling coils with horizontal as well as vertical axis and weight from 3 to 50 tons. Every electromagnet can handle a wide coils range thanks to the particular polar shoes which fit the coil profile.

They are mainly used for the following applications:

• Unloading the production of coils
• Loading and unloading of lorries, rail containers, ships.
• Stocking in store or warehouse

Handling of coils by electromagnets brings to a remarkable spare in store space reducing also the damage on the coil due to the traditional “C” hook. Moreover handling is carried out by one operator with consequent cost reduction. The electromagnets can be designed for handling both vertical and horizontal axis coil.

GAUSS MAGNETI designs and manufactures special electromagnets devoted to handling wire rod coils with horizontal as well as vertical axis . Every electromagnet can handle a wide wire rod coil range thanks to the particular polar shoes which fit the coil profile.

They are mainly used for the following applications:

• Unloading the production of wire rod coils
• Loading and unloading of lorries, rail containers, ships.
• Stocking in store or warehouse

Handling of coils by electromagnets brings to a remarkable spare in store space reducing also the damage on the coil due to the traditional “C” hook. Moreover handling is carried out by one operator with consequent cost reduction.