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SM 25x350 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130350

GTIN: 5906301812982

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

350 mm

Weight

0.01 g

984.00 ZŁ with VAT / pcs + price for transport

800.00 ZŁ net + 23% VAT / pcs

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SM 25x350 [2xM8] / N42 - magnetic separator

Specification/characteristics SM 25x350 [2xM8] / N42 - magnetic separator

properties

values

Cat. no.

130350

GTIN

5906301812982

Production/Distribution

Dhit sp. z o.o.

Country of origin

Poland / China / Germany

Customs code

85059029

Diameter Ø

25 mm [±0,1 mm]

Height

350 mm [±0,1 mm]

Weight

0.01 g [±0,1 mm]

Manufacturing Tolerance

± 0.1 mm

Magnetic properties of material N42

properties

values

units

coercivity bHc ?

860-955

kA/m

coercivity bHc ?

10.8-12.0

kOe

energy density [Min. - Max.] ?

318-334

BH max KJ/m

energy density [Min. - Max.] ?

40-42

BH max MGOe

remenance Br [Min. - Max.] ?

12.9-13.2

kGs

remenance Br [Min. - Max.] ?

1290-1320

actual internal force iHc

≥ 955

kA/m

actual internal force iHc

≥ 12

kOe

max. temperature ?

≤ 80

°C

Physical properties of NdFeB

properties

values

units

Vickers hardness

≥550

Density

≥7.4

g/cm³

Curie Temperature TC

312 - 380

°C

Curie Temperature TF

593 - 716

°F

Specific resistance

150

μΩ⋅Cm

Bending strength

250

Mpa

Compressive strength

1000~1100

Mpa

Thermal expansion parallel (∥) to orientation (M)

(3-4) x 106

°C^-1

Thermal expansion perpendicular (⊥) to orientation (M)

-(1-3) x 10-6

°C^-1

Young's modulus

1.7 x 104

kg/mm²

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The magnetic separator, namely the magnetic roller, uses the force of neodymium magnets, which are embedded in a casing made of stainless steel mostly AISI304. As a result, it is possible to precisely separate ferromagnetic particles from different substances. A fundamental component of its operation is the use of repulsion of N and S poles of neodymium magnets, which enables magnetic substances to be attracted. The thickness of the embedded magnet and its structure pitch affect the range and strength of the separator's operation.

Generally speaking, magnetic separators are used to separate ferromagnetic elements. If the cans are made from ferromagnetic materials, a magnetic separator will be effective. However, if the cans are made of non-ferromagnetic materials, such as aluminum, the separator will not effectively segregate them.

Yes, magnetic rollers find application in the food industry for the elimination of metallic contaminants, including iron fragments or iron dust. Our rods are built from acid-resistant steel, EN 1.4301, suitable for use in food.

Magnetic rollers, often called cylindrical magnets, find application in metal separation, food production as well as waste processing. They help in extracting iron dust in the course of the process of separating metals from other wastes.

Our magnetic rollers are composed of a neodymium magnet embedded in a tube of stainless steel with a wall thickness of 1mm.

Both ends of the magnetic bar will be with M8 threaded openings, allowing for quick installation in machines or magnetic filter drawers. A "blind" version is also possible in manual separators.

In terms of features, magnetic bars differ in terms of flux density, magnetic force lines and the field of the magnetic field. We produce them in two materials, N42 as well as N52.

Usually it is believed that the greater the magnet's power, the better. But, the value of the magnet's power depends on the height of the used magnet and the quality of the material [N42] or [N52], as well as on the area of use and specific needs. The standard operating temperature of a magnetic bar is 80°C.

If the magnet is thin, the magnetic force lines will be more compressed. By contrast, in the case of a thicker magnet, the force lines are extended and extend over a greater distance.

For making the casings of magnetic separators - rollers, frequently stainless steel is utilized, especially types AISI 304, AISI 316, and AISI 316L.

In a salt water contact, AISI 316 steel is recommended due to its exceptional corrosion resistance.

Magnetic rollers stand out for their unique configuration of poles and their ability to attract magnetic particles directly onto their surface, in contrast to other separators that often use complex filtration systems.

Technical designations and terms pertaining to magnetic separators comprise amongst others magnet pitch, polarity, and magnetic induction, as well as the type of steel used.

Magnetic induction for a roller is measured using a teslameter or a gaussmeter with a flat Hall-effect probe, aiming to find the highest magnetic field value close to the magnetic pole. The result is checked in a value table - the lowest is N30. All designations less than N27 or N25 indicate recycling that falls below the standard - they are not suitable.

Neodymium magnetic bars offer many advantages, including excellent separation efficiency, strong magnetic field, and durability. On the other hand, among the drawbacks, one can mention the need for regular cleaning, higher cost, and potential installation challenges.

By ensuring proper maintenance of neodymium magnetic rollers, you should washing after each use, avoiding temperatures up to 80°C. The rollers feature waterproofing IP67, so if they are leaky, the magnets inside can oxidize and lose their power. Magnetic field measurements is recommended be carried out once every 24 months. Caution should be taken during use, as there is a risk of finger injury. If the protective tube is only 0.5 mm thick, it may wear out, which in turn could lead to problems with the magnetic rod seal and product contamination. The effective range of the roller corresponds to its diameter: fi25mm gives an active range of about 25mm, while fi32 gives an active range of about 40mm.

A magnetic roller is a magnetic separator made from a neodymium magnet enclosed in a cylindrical stainless steel housing, used for separating ferromagnetic contaminants from raw materials. They are applied in industries such as food processing, ceramics, and recycling, where metal separation is crucial.

Advantages and disadvantages of neodymium magnets NdFeB.

In addition to their long-term stability, neodymium magnets provide the following advantages:

Their strength is durable, and after approximately ten years, it drops only by ~1% (theoretically),
Their ability to resist magnetic interference from external fields is among the best,
Because of the brilliant layer of gold, the component looks high-end,
The outer field strength of the magnet shows elevated magnetic properties,
Neodymium magnets are known for strong magnetic induction and the ability to work at temperatures up to 230°C or higher (depending on the geometry),
With the option for customized forming and targeted design, these magnets can be produced in various shapes and sizes, greatly improving application potential,
Significant impact in cutting-edge sectors – they are utilized in hard drives, electromechanical systems, clinical machines as well as other advanced devices,
Relatively small size with high magnetic force – neodymium magnets offer strong power in small dimensions, which makes them ideal in small systems

Disadvantages of NdFeB magnets:

They are prone to breaking when subjected to a powerful impact. If the magnets are exposed to shocks, it is suggested to place them in a protective enclosure. The steel housing, in the form of a holder, protects the magnet from breakage while also enhances its overall resistance,
High temperatures may significantly reduce the magnetic power of neodymium magnets. Typically, above 80°C, they experience permanent weakening in performance (depending on size). To prevent this, we offer heat-resistant magnets marked [AH], capable of working up to 230°C, which makes them perfect for high-temperature use,
Due to corrosion risk in humid conditions, it is recommended to use sealed magnets made of synthetic coating for outdoor use,
Limited ability to create complex details in the magnet – the use of a housing is recommended,
Potential hazard from tiny pieces may arise, in case of ingestion, which is significant in the context of child safety. Furthermore, minuscule fragments from these assemblies can complicate medical imaging after being swallowed,
High unit cost – neodymium magnets are costlier than other types of magnets (e.g., ferrite), which may limit large-scale applications

We Recommend Caution with Neodymium Magnets

Keep neodymium magnets as far away as possible from GPS and smartphones.

Magnetic fields interfere with compasses and magnetometers used in navigation for air and sea transport, as well as internal compasses of smartphones and GPS devices.

Dust and powder from neodymium magnets are flammable.

Avoid drilling or mechanical processing of neodymium magnets. Once crushed into fine powder or dust, this material becomes highly flammable.

The magnet coating is made of nickel, so be cautious if you have an allergy.

Studies show a small percentage of people have allergies to certain metals, including nickel. An allergic reaction often manifests as skin redness and rash. If you have a nickel allergy, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.

Neodymium magnets are not recommended for people with pacemakers.

Neodymium magnets produce strong magnetic fields that can interfere with the operation of a heart pacemaker. However, if the magnetic field does not affect the device, it can damage its components or deactivate the device when it is in a magnetic field.

It is crucial not to allow the magnets to pinch together uncontrollably or place your fingers in their path as they attract to each other.

Magnets will crack or crumble with uncontrolled joining to each other. You can't move them to each other. At a distance less than 10 cm you should have them very firmly.

Under no circumstances should neodymium magnets be placed near a computer HDD, TV, and wallet.

Strong fields generated by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other similar devices. They can also damage televisions, VCRs, computer monitors, and CRT displays. Avoid placing neodymium magnets in close proximity to electronic devices.

Neodymium magnets can become demagnetized at high temperatures.

While Neodymium magnets can lose their magnetic properties at high temperatures, it's important to note that the extent of this effect can vary based on factors such as the magnet's material, shape, and intended application.

Magnets made of neodymium are delicate and can easily break and shatter.

Neodymium magnets are characterized by considerable fragility. Magnets made of neodymium are made of metal and coated with a shiny nickel, but they are not as durable as steel. At the moment of connection between the magnets, sharp metal fragments can be dispersed in different directions.

Maintain neodymium magnets away from youngest children.

Neodymium magnets are not toys. Do not allow children to play with them. In the case of swallowing multiple magnets simultaneously, they can attract to each other through the intestinal walls. In the worst case scenario, this can lead to death.

Neodymium magnets are over 10 times stronger than ferrite magnets (the ones in speakers), and their power can shock you.

On our website, you can find information on how to use neodymium magnets. This will help you avoid injuries and prevent damage to the magnets.

Warning!

So that know how strong neodymium magnets are and why they are so dangerous, see the article - Dangerous very powerful neodymium magnets.