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SM 32x150 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130297

GTIN: 5906301812906

Diameter Ø [±0,1 mm]

32 mm

Height [±0,1 mm]

150 mm

Weight

804 g

455.10 ZŁ with VAT / pcs + price for transport

370.00 ZŁ net + 23% VAT / pcs

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SM 32x150 [2xM8] / N42 - magnetic separator

Specification/characteristics SM 32x150 [2xM8] / N42 - magnetic separator

properties

values

Cat. no.

130297

GTIN

5906301812906

Production/Distribution

Dhit sp. z o.o.

Country of origin

Poland / China / Germany

Customs code

85059029

Diameter Ø

32 mm [±0,1 mm]

Height

150 mm [±0,1 mm]

Weight

804 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 main mechanism of the magnetic separator is the use of neodymium magnets, which are placed in a casing made of stainless steel usually AISI304. In this way, it is possible to effectively separate ferromagnetic elements from other materials. An important element of its operation is the repulsion of magnetic poles N and S, which causes magnetic substances to be collected. The thickness of the embedded magnet and its structure pitch determine the range and strength of the separator's operation.

Generally speaking, magnetic separators serve to segregate ferromagnetic particles. 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 separator will not effectively segregate them.

Yes, magnetic rollers find application in the food industry to remove metallic contaminants, including iron fragments or iron dust. Our rods are made from acid-resistant steel, AISI 304, intended for use in food.

Magnetic rollers, otherwise cylindrical magnets, find application in food production, metal separation as well as waste processing. They help in eliminating 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 casing made of stainless steel with a wall thickness of 1mm.

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

In terms of forces, magnetic bars stand out in terms of flux density, magnetic force lines and the area of operation of the magnetic field. We produce them in two materials, N42 as well as N52.

Often it is believed that the greater the magnet's power, the better. However, 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 specific 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. By contrast, in the case of a thicker magnet, the force lines will be extended and reach further.

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

In a saltwater environment, AISI 316 steel is recommended thanks to its exceptional anti-corrosion properties.

Magnetic rollers stand out for their unique configuration of poles and their capability to attract magnetic particles directly onto their surface, in contrast to other devices that often use more complicated 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, aiming to find the highest magnetic field value close to the magnetic pole. The outcome is verified in a value table - the lowest is N30. All designations below N27 or N25 indicate recycling that falls below the standard - they are not suitable.

Neodymium magnetic bars offer a range of benefits such as higher attracting power, longer lifespan, and effectiveness in separating fine metal particles. However, some of the downsides may involve the need for regular cleaning, higher cost, and potential installation challenges.

To properly maintain of neodymium magnetic rollers, it is recommended regularly cleaning them from contaminants, avoiding high temperatures up to 80°C, 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 not sealed, the magnets inside can oxidize and lose their power. Magnetic field measurements is recommended be carried out every two years. Caution should be taken during use, as there is a risk 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 range of the roller is equal 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 applied in industries such as food processing, ceramics, and recycling, where the removal of iron metals and iron filings is essential.

Advantages and disadvantages of neodymium magnets NdFeB.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

Their power is maintained, and after approximately ten years, it drops only by ~1% (theoretically),
They are very resistant to demagnetization caused by external field interference,
Thanks to the glossy finish and silver coating, they have an visually attractive appearance,
They possess intense magnetic force measurable at the magnet’s surface,
Thanks to their high temperature resistance, they can operate (depending on the shape) even at temperatures up to 230°C or more,
Thanks to the flexibility in shaping and the capability to adapt to unique requirements, neodymium magnets can be created in different geometries, which expands their functional possibilities,
Key role in advanced technical fields – they are utilized in computer drives, electromechanical systems, diagnostic apparatus along with sophisticated instruments,
Thanks to their concentrated strength, small magnets offer high magnetic performance, with minimal size,

Disadvantages of rare earth magnets:

They are fragile when subjected to a strong impact. If the magnets are exposed to physical collisions, it is advisable to use in a metal holder. The steel housing, in the form of a holder, protects the magnet from fracture and enhances its overall strength,
They lose field intensity at elevated temperatures. Most neodymium magnets experience permanent decline in strength when heated above 80°C (depending on the form and height). However, we offer special variants with high temperature resistance that can operate up to 230°C or higher,
Due to corrosion risk in humid conditions, it is wise to use sealed magnets made of plastic for outdoor use,
Limited ability to create complex details in the magnet – the use of a external casing is recommended,
Potential hazard due to small fragments may arise, when consumed by mistake, which is crucial in the context of child safety. Additionally, tiny components from these assemblies can hinder health screening if inside the body,
High unit cost – neodymium magnets are pricier than other types of magnets (e.g., ferrite), which increases the cost of large-scale applications

Highest magnetic holding force – what affects it?

The given holding capacity of the magnet means the highest holding force, assessed in the best circumstances, that is:

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
in conditions of no clearance
in a perpendicular direction of force
at room temperature

Practical aspects of lifting capacity – factors

Practical lifting force is determined by factors, by priority:

Air gap between the magnet and the plate, because even a very small distance (e.g. 0.5 mm) causes 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 a perpendicular force was applied, however under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a slight gap {between} the magnet’s surface and the plate decreases the lifting capacity.

Handle with Care: Neodymium Magnets

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.

Neodymium magnets can become demagnetized at high temperatures.

Although magnets have shown to retain their effectiveness up to 80°C or 175°F, this temperature may vary depending on the type of material, shape, and intended use of the magnet.

Under no circumstances should neodymium magnets be brought close to GPS and smartphones.

Neodymium magnets are a source of intense magnetic fields that cause interference with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

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

Make sure to review all the information we have provided. This will help you avoid harm to your body and damage to the magnets.

Keep neodymium magnets away from 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.

The magnet is coated with nickel - be careful if you have an allergy.

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 should not be around 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.

Under no circumstances should neodymium magnets be placed 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, etc. devices. They can also damage videos, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.

Neodymium magnets are known for being fragile, which can cause them to crumble.

In the event of a collision between two neodymium magnets, it can result in them getting chipped. Despite being made of metal and coated with a shiny nickel plating, they are not as hard as steel. In the case of a collision between two magnets, there can be a scattering of small sharp metal fragments in different directions. Protecting your eyes is essential.

Neodymium magnets can attract to each other due to their immense internal force, causing the skin and other body parts to get pinched and resulting in significant injuries.

Magnets will attract each other within a distance of several to about 10 cm from each other. Remember not to place fingers between magnets or alternatively in their path when attract. Depending on how large the neodymium magnets are, they can lead to a cut or a fracture.

Warning!

To raise awareness of why neodymium magnets are so dangerous, read the article titled How dangerous are powerful neodymium magnets?.