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SM 32x350 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130301

GTIN: 5906301812944

5

Diameter Ø [±0,1 mm]

32 mm

Height [±0,1 mm]

350 mm

Weight

1870 g

1045.50 with VAT / pcs + price for transport

850.00 ZŁ net + 23% VAT / pcs

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SM 32x350 [2xM8] / N42 - magnetic separator

Specification/characteristics SM 32x350 [2xM8] / N42 - magnetic separator
properties
values
Cat. no.
130301
GTIN
5906301812944
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
32 mm [±0,1 mm]
Height
350 mm [±0,1 mm]
Weight
1870 g [±0,1 mm]
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N42

properties
values
units
remenance Br [Min. - Max.] ?
12.9-13.2
kGs
remenance Br [Min. - Max.] ?
1290-1320
T
coercivity bHc ?
10.8-12.0
kOe
coercivity bHc ?
860-955
kA/m
actual internal force iHc
≥ 12
kOe
actual internal force iHc
≥ 955
kA/m
energy density [Min. - Max.] ?
40-42
BH max MGOe
energy density [Min. - Max.] ?
318-334
BH max KJ/m
max. temperature ?
≤ 80
°C

Physical properties of NdFeB

properties
values
units
Vickers hardness
≥550
Hv
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

Shopping tips

The magnetic separator, namely the magnetic roller, uses the force of neodymium magnets, which are embedded in a construction made of stainless steel mostly AISI304. Due to this, it is possible to effectively segregate ferromagnetic particles from the mixture. A fundamental component of its operation is the repulsion of magnetic poles N and S, which allows 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 serve to segregate ferromagnetic elements. If the cans are made from ferromagnetic materials, the separator will be able to separate them. However, if the cans are made of non-ferromagnetic materials, such as aluminum, the magnetic separator will not be effective.
Yes, magnetic rollers are used in the food sector for the elimination of metallic contaminants, for example iron fragments or iron dust. Our rollers are made from durable acid-resistant steel, AISI 304, suitable for use in food.
Magnetic rollers, otherwise magnetic separators, are used in metal separation, food production as well as recycling. They help in extracting iron dust in the course of the process of separating metals from other wastes.
Our magnetic rollers consist of a neodymium magnet embedded in a stainless steel tube cylinder of stainless steel with a wall thickness of 1mm.
From both sides of the magnetic bar will be with M8 threaded holes - 18 mm, allowing for quick installation in machines or magnetic filter drawers. A "blind" version is also possible in manual separators.
In terms of magnetic properties, magnetic bars differ in terms of magnetic force lines, flux density and the area of operation of the magnetic field. We produce them in materials, N42 as well as N52.
Usually it is believed that the greater the magnet's power, the more effective. But, 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 application and specific needs. The standard operating temperature of a magnetic bar is 80°C.
When the magnet is thin, the magnetic force lines are more compressed. On the other hand, when the magnet is thick, the force lines will be extended and extend over a greater distance.
For creating the casings of magnetic separators - rollers, frequently stainless steel is employed, especially types AISI 304, AISI 316, and AISI 316L.
In a salt water environment, type AISI 316 steel is highly recommended thanks to its excellent corrosion resistance.
Magnetic rollers are characterized by their specific arrangement of poles and their ability to attract magnetic particles directly onto their surface, in contrast to other devices that may utilize more complicated filtration systems.
Technical designations and terms related to magnetic separators include among others magnet pitch, polarity, and magnetic induction, 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 verified in a value table - the lowest is N30. All designations below N27 or N25 suggest recycling that doesn't meet the standard - they are not suitable.
Neodymium magnetic bars offer a range of benefits such as excellent separation efficiency, strong magnetic field, and durability. Disadvantages may include the need for regular cleaning, higher cost, and potential installation challenges.
For proper maintenance of neodymium magnetic rollers, you should they should be regularly cleaned, avoiding temperatures above 80 degrees. The rollers feature waterproofing IP67, so if they are leaky, the magnets inside can rust and weaken. Testing of the rollers is recommended be carried out every two years. Caution should be taken during use, as it’s possible of finger injury. If the protective tube is only 0.5 mm thick, it may wear out, which in turn could cause problems with the magnetic rod seal and product contamination. The 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, 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.

Apart from their notable magnetic energy, neodymium magnets have these key benefits:

  • They do not lose their strength nearly 10 years – the loss of lifting capacity is only ~1% (according to tests),
  • They remain magnetized despite exposure to strong external fields,
  • Because of the reflective layer of gold, the component looks high-end,
  • They have extremely strong magnetic induction on the surface of the magnet,
  • They are suitable for high-temperature applications, operating effectively at 230°C+ due to advanced heat resistance and form-specific properties,
  • Thanks to the flexibility in shaping and the capability to adapt to specific requirements, neodymium magnets can be created in diverse shapes and sizes, which expands their application range,
  • Significant impact in advanced technical fields – they are utilized in HDDs, rotating machines, medical equipment as well as technologically developed systems,
  • Relatively small size with high magnetic force – neodymium magnets offer strong power in small dimensions, which allows for use in compact constructions

Disadvantages of NdFeB magnets:

  • They can break when subjected to a sudden impact. If the magnets are exposed to external force, it is suggested to place them in a protective case. The steel housing, in the form of a holder, protects the magnet from damage while also enhances its overall durability,
  • Magnets lose magnetic efficiency when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible performance loss (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 humid environment – during outdoor use, we recommend using waterproof magnets, such as those made of rubber,
  • The use of a protective casing or external holder is recommended, since machining fine details in neodymium magnets is restricted,
  • Potential hazard linked to microscopic shards may arise, when consumed by mistake, which is important in the family environments. Furthermore, tiny components from these devices may hinder health screening when ingested,
  • Higher purchase price is one of the drawbacks compared to ceramic magnets, especially in budget-sensitive applications

Best holding force of the magnet in ideal parameterswhat it depends on?

The given holding capacity of the magnet represents the highest holding force, measured under optimal conditions, namely:

  • using a steel plate with low carbon content, serving as a magnetic circuit closure
  • of a thickness of at least 10 mm
  • with a polished side
  • with zero air gap
  • under perpendicular detachment force
  • at room temperature

Lifting capacity in real conditions – factors

In practice, the holding capacity of a magnet is conditioned by the following aspects, arranged from the most important to the least relevant:

  • Air gap between the magnet and the plate, because even a very small distance (e.g. 0.5 mm) can cause a drop in lifting force of up to 50%.
  • Direction of applied force, because the maximum lifting capacity is achieved under perpendicular application. The force required to slide the magnet along the plate is usually several times lower.
  • Thickness of the plate, as a plate that is too thin causes part of the magnetic flux not to be used and to remain wasted in the air.
  • Material of the plate, because higher carbon content lowers holding force, while higher iron content increases it. The best choice is steel with high magnetic permeability and high saturation induction.
  • Surface of the plate, because the more smooth and polished it is, the better the contact and consequently the greater the magnetic saturation.
  • Operating temperature, since all permanent magnets have a negative temperature coefficient. This means that at high temperatures they are weaker, while at sub-zero temperatures they become slightly stronger.

* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under shearing force the load capacity is reduced by as much as 75%. In addition, even a minimal clearance {between} the magnet and the plate lowers the lifting capacity.

Caution with Neodymium Magnets

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

Magnets will attract each other within a distance of several to around 10 cm from each other. Don't put your fingers in the path of magnet attraction, because a significant injury may occur. Magnets, depending on their size, are able even cut off a finger or alternatively there can be a significant pressure or even a fracture.

Neodymium magnets can demagnetize at high temperatures.

Although magnets are generally resilient, their ability to retain their magnetic strength can be influenced by factors like the type of material used, the magnet's shape, and the intended purpose for which it is employed.

Neodymium magnets should not be near people with pacemakers.

Neodymium magnets generate very strong magnetic fields that can interfere with the operation of a pacemaker. This happens because such devices have a function to deactivate them in a magnetic field.

Neodymium magnetic are noted for their fragility, which can cause them to shatter.

Magnets made of neodymium are fragile as well as 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 collision between the magnets, small sharp metal fragments can be propelled in various directions at high speed. Eye protection is recommended.

Do not bring neodymium magnets close to 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 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.

The magnet is coated with nickel. Therefore, exercise caution 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 over 10 times stronger than ferrite magnets (the ones in speakers), and their power can surprise you.

To handle magnets properly, it is best to familiarize yourself with our information beforehand. This will help you avoid significant harm to your body and the magnets themselves.

You should maintain neodymium magnets at a safe distance from the wallet, computer, and TV.

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

  Do not give neodymium magnets to youngest children.

Neodymium magnets are not toys. You cannot allow them to become toys for children. Small magnets pose a serious choking hazard or can attract to each other in the intestines. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.

Safety precautions!

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

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98