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SM 25x250 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130371

GTIN: 5906301813194

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

250 mm

Weight

0.01 g

762.60 ZŁ with VAT / pcs + price for transport

620.00 ZŁ net + 23% VAT / pcs

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SM 25x250 [2xM8] / N52 - magnetic separator

Specification/characteristics SM 25x250 [2xM8] / N52 - magnetic separator

properties

values

Cat. no.

130371

GTIN

5906301813194

Production/Distribution

Dhit sp. z o.o.

Country of origin

Poland / China / Germany

Customs code

85059029

Diameter Ø

25 mm [±0,1 mm]

Height

250 mm [±0,1 mm]

Weight

0.01 g [±0,1 mm]

Manufacturing Tolerance

± 0.1 mm

Magnetic properties of material N52

properties

values

units

coercivity bHc ?

860-995

kA/m

coercivity bHc ?

10.8-12.5

kOe

energy density [Min. - Max.] ?

380-422

BH max KJ/m

energy density [Min. - Max.] ?

48-53

BH max MGOe

remenance Br [Min. - Max.] ?

14.2-14.7

kGs

remenance Br [Min. - Max.] ?

1420-1470

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 main mechanism of the magnetic separator is the use of neodymium magnets, which are embedded in a construction made of stainless steel usually AISI304. As a result, it is possible to precisely segregate ferromagnetic particles from other materials. A key aspect of its operation is the use of repulsion of N and S poles of neodymium magnets, which allows magnetic substances to be attracted. The thickness of the magnet and its structure pitch affect the power and range of the separator's operation.

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

Yes, magnetic rollers find application in food production for the elimination of metallic contaminants, such as iron fragments or iron dust. Our rollers are constructed from durable acid-resistant steel, EN 1.4301, approved for use in food.

Magnetic rollers, often called magnetic separators, find application in metal separation, food production as well as recycling. They help in eliminating iron dust during the process of separating metals from other materials.

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

Both ends of the magnetic bar can be with M8 threaded holes - 18 mm, which enables simple mounting in machines or magnetic filter drawers. A "blind" version is also possible in manual separators.

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

Usually it is believed that the stronger the magnet, the better. Nevertheless, the value of the magnet's power is based 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 anticipated needs. The standard operating temperature of a magnetic bar is 80°C.

In the case where the magnet is more flat, the magnetic force lines are short. On the other hand, when the magnet is thick, the force lines will be longer and reach further.

For constructing the casings of magnetic separators - rollers, most often stainless steel is employed, especially types AISI 316, AISI 316L, and AISI 304.

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

Magnetic bars are characterized by their specific arrangement of poles and their ability to attract magnetic particles directly onto their surface, as opposed to other separators that often use complex filtration systems.

Technical designations and terms related to magnetic separators include among others polarity, magnetic induction, magnet pitch, as well as the type of steel used.

Magnetic induction for a magnet on a roller is measured using a teslameter or a gaussmeter with a flat Hall-effect probe, seeking the highest magnetic field value near the magnetic pole. The outcome is checked in a value table - the lowest is N30. All designations below N27 or N25 suggest recycling that falls below the standard - they are not suitable.

Neodymium magnetic bars offer a range of benefits such as excellent separation efficiency, strong magnetic field, and durability. However, some of the downsides may involve the need for regular cleaning, higher cost, and potential installation challenges.

By ensuring proper maintenance of neodymium magnetic rollers, you should regularly cleaning them from contaminants, avoiding high temperatures above 80 degrees, and protecting them from moisture if the threads are not sealed – in ours, they are. The rollers our rollers have waterproofing IP67, so if they are leaky, the magnets inside can oxidize and lose their power. Testing of the rollers is recommended be carried out once every 24 months. Care should be taken, as it’s possible getting pinched. 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.

Magnetic rollers are cylindrical neodymium magnets placed in a casing made of corrosion-resistant stainless steel, which are used to remove metal contaminants from bulk and granular materials. They are used in the food industry, recycling, and plastic processing, where metal separation is crucial.

Advantages and disadvantages of neodymium magnets NdFeB.

Besides their stability, neodymium magnets are valued for these benefits:

They do not lose their strength nearly ten years – the loss of power is only ~1% (based on measurements),
They protect against demagnetization induced by surrounding magnetic influence remarkably well,
The use of a decorative nickel surface provides a refined finish,
They possess strong magnetic force measurable at the magnet’s surface,
With the right combination of magnetic alloys, they reach significant thermal stability, enabling operation at or above 230°C (depending on the form),
The ability for custom shaping or adaptation to custom needs – neodymium magnets can be manufactured in a wide range of shapes and sizes, which enhances their versatility in applications,
Key role in modern technologies – they serve a purpose in computer drives, rotating machines, diagnostic apparatus along with technologically developed systems,
Relatively small size with high magnetic force – neodymium magnets offer intense magnetic field in compact dimensions, which makes them useful in small systems

Disadvantages of NdFeB magnets:

They can break when subjected to a powerful impact. If the magnets are exposed to external force, it is advisable to use in a metal holder. The steel housing, in the form of a holder, protects the magnet from damage and increases its overall durability,
Magnets lose magnetic efficiency when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible power drop (influenced by the magnet’s dimensions). To address this, we provide [AH] models with superior thermal resistance, able to operate even at 230°C or more,
They rust in a moist environment, especially when used outside, we recommend using encapsulated magnets, such as those made of rubber,
Limited ability to create threads in the magnet – the use of a housing is recommended,
Possible threat from tiny pieces may arise, especially if swallowed, which is important in the family environments. Additionally, small elements from these devices have the potential to complicate medical imaging when ingested,
High unit cost – neodymium magnets are pricier than other types of magnets (e.g., ferrite), which increases the cost of large-scale applications

Caution with Neodymium Magnets

Neodymium magnets are the most powerful magnets ever invented. Their strength can surprise you.

Familiarize yourself with our information to correctly handle these magnets and avoid significant injuries to your body and prevent disruption to the magnets.

Neodymium magnets should not be near people with pacemakers.

Neodymium magnets generate strong magnetic fields. As a result, they interfere with the operation of a pacemaker. This is because many of these devices are equipped with a function that deactivates the device in a magnetic field.

If you have a nickel allergy, avoid contact with neodymium magnets.

Studies clearly indicate a small percentage of people who suffer from metal allergies such as nickel. An allergic reaction often manifests as skin redness and rash. If you have a nickel allergy, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.

Neodymium magnets can attract to each other, pinch the skin, and cause significant injuries.

In the case of holding a finger in the path of a neodymium magnet, in that situation, a cut or even a fracture may occur.

Do not give neodymium magnets to children.

Neodymium magnets are not toys. Do not allow children to play with them. They can be a significant choking hazard. If multiple magnets are swallowed, they can attract to each other through the intestinal walls, causing severe injuries, and even death.

Do not place neodymium magnets near a computer HDD, TV, and wallet.

Neodymium magnets produce intense magnetic fields that can destroy magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, or other devices. They can also damage devices like video players, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.

Keep neodymium magnets away from GPS and smartphones.

Strong fields generated by neodymium magnets interfere with compasses and magnetometers used in navigation, as well as internal compasses of smartphones and GPS devices.

Dust and powder from neodymium magnets are highly flammable.

Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. Once crushed into fine powder or dust, this material becomes highly flammable.

Magnets made of neodymium are particularly fragile, which leads to shattering.

Neodymium magnetic are fragile and will crack if allowed to collide with each other, even from a distance of a few centimeters. They are coated with a shiny nickel plating similar to steel, but they are not as hard. At the moment of connection between the magnets, tiny sharp metal fragments can be propelled in various directions at high speed. Eye protection is recommended.

Neodymium magnets can demagnetize at high temperatures.

Under specific conditions, Neodymium magnets can lose their magnetism when subjected to high temperatures.

Safety rules!

In order for you to know how powerful neodymium magnets are and why they are so dangerous, read the article - Dangerous powerful neodymium magnets.