Industrial Magnetic Separators & Assemblies for Food, Minerals and Aggregates, Glass, Plastic, Lithium Battery Production

 

WHAT IS MAGNETIC SEPARATION?

Iron filings magnetic separation is a widely adopted technique and stands as a crucial process for many industries. And permanent magnets play a key role in separating different materials. Essentially, this method harnesses the power of magnets to distinguish iron from mixed materials. Its primary function is to isolate, extract, and enhance the quality of materials, contributing to a purer end product.

MAGNETIC SEPARATION IN VARIOUS INDUSTRIES

Magnetic separation technology can handle a range of raw materials needed for production including powders, granules, liquids or pastes. It has a wide range of applications and plays an important role in many industries, including:

• Minerals and Mineral Separation: Magnetic separation technology is very important in the processing of minerals and aggregates, and can be used to extract iron-containing minerals, such as iron ore, from ores to make them purer.

• Food safety: During the processing of food products (flour, starch, sugar, chocolate, tea and cereals), magnetic separation can be used to remove metallic impurities in food to ensure that the food is purer and safer.

• Production Safety: Magnetic separation can be used to remove iron and steel filings that may contaminate the coolant in metalworking operations, as well as protect your equipment from serious damage and keep the production lines free of hazardous metal debris.

• Plastics Industry: Magnetic separators can protect expensive process equipment (molding tools, grinders, extruders, nozzles, mixers and rollers) from metal (nails, screws, or metal caps), thereby reducing breakdowns and increasing productivity; in addition to preventing finished products from being contaminated with iron, which can improve the purity of plastic products.

• Glass Industry: The purity of potassium feldspar and quartz sand is related to the quality of ceramic glass and other products, so glass manufacturers will need to use magnetic separation equipment to remove iron and purify raw materials.

• Medical Applications: In medicine, magnetic separation is used for cell separation and purification in biological samples, as well as separation steps in the preparation and production of drugs.

• Oil and Gas Production: Magnetic separation is used to refine and purify oil and gas by removing metallic impurities.

• New Energy Lithium Battery Production: Metal impurities can affect the discharge process of lithium batteries, which can lead to battery safety issues. Magnetic separation can remove iron impurities and magnetic substances in lithium anode slurry (e.g. lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate ternary materials) to ensure the stability of lithium battery performance.

• Recycling and Waste Treatment: Magnetic separation is used to separate and recycle metal wastes in the recycling industry of cement, aggregate, wood chips, plastics, glass, electronic wastes and so on.

• Environmental Protection: In the environmental field, magnetic separation helps to treat pollutants and purify the environment by removing harmful metals from water or soil.

SPECIFIC MAGNETIC SEPARATION EQUIPMENT:

Magnetic separation device is often installed at critical HACCP or inspection points in the product flow. There are also many types of magnetic separation devices. According to the properties of the material to be separated and the requirements of the specific application, iron filings magnetic separation magnet is divided into the following categories:

MAGNETIC SEPARATOR

It is generally a set of large-scale magnetic separation equipment designed and produced by mechanical equipment manufacturers according to different applications. For example, mining magnetic separation equipment and environmentally friendly magnetic separation equipment.

PERMANENT MAGNETS

Permanent magnet is the simplest type of magnetic separator. Its strong magnetic field can attract and separate iron-containing materials. As the material passes through the magnet, the iron impurities are attracted to the magnet, causing separation.

Different magnet materials have different properties, so selection is very important. The type of magnet material depends on the density of the product, flow rate, operating temperature, and the type of ferrous contaminant you are trying to remove.

Rare earth magnets used in permanent magnetic separators include neodymium iron boron, samarium cobalt, alnico and ferrite.

• NdFeB magnets have the highest strength and are suitable for situations where product density and flow rate are high, as well as when weak magnetic debris and work-hardened steel are encountered.

• Samarium cobalt and alnico magnets are weaker but can withstand higher temperatures.

• Ferrite magnets are lower in strength but can produce a deeper magnetic field and are often used to separate miscellaneous iron with larger particle sizes. It can also withstand higher temperatures and exposure to corrosive elements.

MAGNETIC COMPONENT

The magnetic component is a straightforward yet effective tool for magnetic separation. It combines multiple permanent magnets with stainless steel, creating a design that maximizes the magnetic field’s strength for a more efficient separation process.

With the increasing need for magnetic separation in production, these components have evolved from tailored solutions to a wide range of standardized series products, catering to various specific purposes and demands in the industry.

The magnetic rod has a simple structure and is mainly composed of magnets and steel tubes. Round or square tubes are available. The ends of  rod can be customizezd to a variety of styles, including threaded holes, threaded rods, flat heads, and pointed heads. Stainless steel materials include SUS304 & SUS316. The latter is more corrosion-resistant and suitable for the pharmaceutical and food industries.

The magnetic rack is a combination of several magnetic rods arranged at a certain distance. Generally designed as a single-layer or multi-layer structure. This structure forms a gradient distributed spatial magnetic field, which will greatly improve the efficiency of impurity removal. They are generally placed in places such as stockers, drawer boxes and hoppers.

The magnetic plate looks like a simple stainless-steel plate, but it is not simple at all inside. It contains a high-density magnetic field composed of powerful rare earth magnets and iron sheets. It is easy to clean and install. It is mainly used to remove nails, nuts and wires during the transportation of gravel, grain, sugar, flour, wood, minerals or other granular or lumpy materials. and other iron impurities.

Magnetic rollers are more complex magnetic components. The structure is similar to the motor magnetic shaft, but the size is much larger. The magnets are densely mounted on the outer ring surface of the magnetic shaft. The magnetic roller (magnetic drum) can use cheap ferrite permanent magnets or magnetic rare earth permanent magnets, and its magnetic field can be as high as 15000GS+.

SEPARATION MAGNET MANUFACTURER

Magnetic separation technology is a crucial element across various industries, ensuring essential purification, safety, and efficiency in production and processing. China Magnets Source specializes in tailoring magnets and magnetic components specifically for magnetic separation purposes. Should you have any inquiries or requirements in this field, we welcome you to reach out to us without hesitation.

Custom & Wholesale Powerful Mounting Magnets for Home or Industrial Applications

What is mounting magnet?

Mounting magnet is the general name of all types of permanent magnets and assemblies used in offices, workshops, stores and trade shows as hanging / fixing / installing everything from different lamps on the car roof to artworks in museums.

It is one of the most practical fixing solutions where drilling is not suitable on surfaces, available in a wide range of colors, shapes, material and assemblies.

THE RIGHT CHOICE of mounting magnet will ensure safe, convenient and affordable installing solutions for your applications.

Today I’m going to share all type of mounting magnets we can do for you and how to choose.

Permanent magnet assembly

Custom Powerful Pot/Cup Magnet Pot/cup magnet is a simple magnet systems with super-strong adhesive force designed exclusively for holding/mounting/fixing application at home or at work as well as in industry or for craft, hobby and leisure. The permanent magnets are affixed into a durable steel cup or channel which makes a magnetic shielding area and concetrates all magnetic force on one side of magnet. So the pull force of pot magnet is bigger than plain permanent magnet and can hold more weight. Most of pot magnets are round shapes and mainly used as light base for vehicle signs or lightbar, also known as round base magnets. They features countersunk holes or threaded features that allow for different mounting methods, no matter standard hardware (nuts and bolts), or various hooks. Possible applications: position or hold or mount inspection equipment, indicator gauges, car lamps, work LED, signs, exhibit fixtures, tools, antennas and more. Plant construction Metal construction Booth and store construction School, training & studies Hobby & leisure

Custom Strong Colorful Outdoors Plastic Coated Waterproof Neodymium Magnets Uncoated neodymium magnets are easily oxidized. To protect our NdFeB magnets from corrosion, we will use different plating. Nickel copper nickel coating is the most common one. But even with electroplated coatings; you'd better to use neodymium magnets exclusively in dry indoor areas. If you want to use magnets in the water or outdoors, NiCuNi+plastic coated is the right choice. Our plastic coated magnets are custom powerful neodymium magnets wrapped with environment friendly colorful plastic. They are waterproof and crashproof. Possible applications: In office (e.g. magnetic whiteboards) Long-term use outdoors In wet surroundings (e.g. bathroom) Under water (e.g. Use neodymium magnets in the aquarium to hold flag racks, powerheads)

Custom Self-adhesive Backed Neodymium Magnet Our adhesive backed magnets are very powerful because of using super strong rare earth neodymium magnet with high quality pre-applied adhesive backing. Most come in small round and block shapes, but we also offer custom-shape adhesive backed mounting magnets. Due to using different adhesives such as 3M 468 or 3M 467MP or 3M VHP, we can glue magnet onto various surfaces, especially cardboard and paper. Possible applications: Clasps/closures for books, boxes, folders, mailings, greeting cards, book covers, presentation materials and other printed items, etc. Hanging up pictures on the wall without holes Magnetic name tags for weddings and office Mounting arts and crafts on a wall Hanging a poster

Custom Rubber Coated Neodymium Magnets and Assembly Rubber's elasticity, toughness, impermeability, adhesiveness, and electrical resistance make it useful as a coating material. Neodymium magnets wrapped in protective coating rubber feature waterproofing and crushproof, as well as apply to delicate metal surfaces, providing a good level of corrosion protection for outdoor use and leaving no scratch. With neodymium magnets (NdFeB) inside, rubber coated magnets have extreme strong holding forces. With rubber coating outside, neodymium magnets have great durability and high friction which can stand steadily on various surfaces, such as glass. Rubber coated magnet assembly is a magnet system with bore, countersunk, eyebolt and hook that can be used with a range of standard fasteners and attachments. Possible applications: These high strength, soft touch rubber coated magnets and assemblies are designed for different holding/mounting applications, such as furniture fixings, retail fixing, hanging artwork, keeping doors and drawers closed, holding heavy objects: lights, equipment, exhibit fixtures, tools, and other items in warehouses, manufacturing facilities, garages, work stations, etc.

Standard Powerful Car Wrap Magnet / Vehicle Gripper Magnet for Sign Making & Wrapping Our magnetic sign gripper is made of strong rare earth neodymium magnet as a powerful magnetic mounting tool. Material: Neodymium Magnet Grade: N35 Size: D43 x 6mm Coating: Ni-Cu-Ni + rubber Max.Working Temperature: indoor temperature Pull Force: about 5 kgs The rubber coated appearance is for safe contact with painted surfaces and the long handle is for easy leverage when position delicate vinyl media frequently and makes it easy to remove. Possible applications: It’s ideal for holding vinyl graphics in place on the surfaces of vehicle or for other mounting applications when in contact with steel surfaces, like fix paper on the whiteboard.

Plain permanent magnet

a. Material:

Sintered Neodymium Magnet	Samarium Cobalt Magnet	Alnico Magnet	Ceramic Magnet
Cost-Effective strongest magnetic force need surface treatment working Temp.: 80-200 ℃	expensive strong magnetic force good anti-oxidation working Temp.: 250- 350℃	cheap weakest magnetic force good anti-oxidation working Temp.: 550℃	cheap less magnetic force good anti-oxidation working Temp.: 250℃

b. Shape:

Disc Magnet	Ring Magnet	Countersunk Magnet	Block Magnet	custom

c. Coating:

Zn, Epoxy, NiCuNi, Gold	Everlube	Spraying Plastic	Plastic	Rubber

The difference between plain permanent magnet and mounting magnet assembly

1. Usually plain permanent magnet doesn’t need any mold fee; and it is more flexible which can be better for embedded application
2. Overmolding plastic & rubber coated neodymium magnet assemblies are waterproof and durability; magnets with silicone rubber covers can prevent scratching paint; magnet with plastic need mold fee.
3. Our pot magnet, channel magnet and hook magnet are constructed with more durability.
4. Mounting magnet assemblies have more mounting options, such as male or female threads, countersunk, counterbore, through-hole‎, 3M adhesive, clip and so on.

China Magnets Source Material Ltd not only provides custom powerful mounting magnets in wholesale, but also in sample or trail order.

Ask price of mounting magnet, please contact us at sales@china-magnets-source-material.com.

Arc Segments Permanent Magnets – the Most Popular High-Performance Motor Magnets Solutions

Browse by Category: Click any of the links below to jump to each category.

1. Aadvantages of Segment Arc Motor Magnet
2. The Performance of Magnetic Segment Impact on Motor
3. How to Choose Motor Segment Material?
4. Permanent Magnet: the Core of PM Motor
5. How to Join Neodymium Magnet Arcs Into a Radially Ring?
6. Motor Magnet Customized Service

We recently highlighted radially magnetized ring magnet for micro motor rotor in our previous blog. However, this does not mean that the traditional arc segment motor magnet will disappear gradually.Segment motor magnet has advantages of easy manufacture and low cost compared with radial magnet ring. It’s still the most common motor magnet shape, especially for PM DC motor.

1. Compared with electro-magnetic, we can list more advantages of segment arc motor magnet:

1. Simplify the structure of motor
2. Easy maintenance
3. Light weight
4. Small volume
5. Operational reliability
6. low energy consumption

2. The performance of magnetic segment impact on motor or generator:

1. Br (residual magnetic flux density): high Br can ensure that the motor has a high speed, high torque and high output power. Then the motor will have a high efficiency. Such as for starter motor, high Br magnet arc will provide high instantaneous start-up force.
2. Hcb: high Hcb can provide enough electromotive force needed for motor output, making the operating point of motor close to the maximum energy product to take full use of magnetic property.
3. Hcj: high Hcj can ensure there is a strong resistance against the demagnetization caused by motor overload, against the anti-aging, and against the low temperature. If you need durability motor, then choose high HC motor segment magnets.
4. Magnetic energy product (BH) max.: the higher (BH) max. , the better working coefficient of permanent segment magnets in the motor actual operation.
5. Magnetic flux: the bigger the better; it will greatly improve the work efficiency of the motor.
6. The rectangle degree of the demagnetization curve: the higher rectangle factor , the smaller the dynamic losses in the motor.
7. The higher resistivity, the smaller the eddy current losses.

3. How to choose motor segment material?

For traditional AC motor, ferrite and AlNiCo segment magnets are most applied. With the higher request on motor power, more and more motor manufacturers use ndfeb and smco magnet which have super high magnetic energy product. However, they are more expensive because neodymium magnet and samarium cobalt magnet segments belong to rare earth magnet. Please click here to get more analysis of different magnet material.

4. Permanent Magnet: the core of PM motor

In order to guarantee the steadily electrical performance and long-term safe and reliable operation of electric vehicles, it requires the magnetic property of permanent magnet material remains stable. Considering magnetic performance influenced by work environment, temperature and time, the reliability of permanent motor magnets can be divided into thermal stability, time stability, chemical stability and magnetic stability.

1. Temperature stability can be shown by Curie temperature and the maximum operating temperature. As the temperature rises, the magnetic properties gradually reduce. When raises to a certain temperature, the magnetization disappear. This certain temperature is the Curie temperature of the permanent magnet materials, also known as the Curie point. The deficiency of NdFeB permanent magnet is relatively low Curie temperature, but higher temperature coefficient.Thus neodymium magnet will lost much magnetic force if work under high temperature. Due to the high temperature coefficient of NdFeB permanent magnet, the magnetic properties is poor. To this end, it must pay more attention to Max. working temp.of sintered nedfeb magnet when you select an magnet grade. The test method of magnet temperature stability is aging test
2. Time stability is putting the permanent magnet at a certain temperature for a long time, observing the change of its magnetic properties over time. These NdFeB permanent magnets added Co + Dy + Nb will obtain better time stability.
3. Chemical stability refers to the anti-oxidation and corrosion-resistant of permanent magnet material. Compared with the traditional ferrite or samarium cobalt (Smco) or alnico magnets, the chemical stability of sintered NdFeB magnet is the worst. Currently, the primarily solution is adding some alloy elements such as Co, Ni, Al and Cr, etc., while in the sintering process, increasing the density and reducing the porosity of magnetic material.Another approach is make certain magnet surface treatment such as electroplating. This can obtain a practical corrosion resistance for magnet.
4. Magnetic stability is based on magnetic material, and also affected by temperature, time, external magnetic field, chemical corrosion, radiation, mechanical vibration or shock and other factors.

5. How to join neodymium magnet arcs, which are diameter magnetized, to create a cylindrical ring that is radially magnetized?

The general approach is to make a sleeve or frame to put arc magnets in that will keep them in order and don’t jump around. The sleeve here has to be made of something sturdy and nonmagnetic, such as aluminum, copper or Q235 low carbon steel. Due to strong repelling force, it’s better to operate by those experienced workers. If you are the first time to assemble segment magnets, just be careful. Halbach array magnets also utilize frame or other tools to overcome the strong magnetic repulsive force between the same pole sides of two magnets and keep them fixing together.

6. Motor Magnet Customized Service

According to special requirement of different motors or generators, there is few standard segment rotor magnets available on the market for customers to choose. Every motor manufacturer will design different product based on their technology, market direction, therefore segment magnets of motor rotor need to be customized. China Magnets Source Material Ltd a professional magnets manufacturer for many years and specialized in motor NdFeB magnet. When you ask for a quote, please provide detailed information as follow:

1. Material: Sintered Neodymium Iron Boron Magnets or bonded ndfeb magnet or samarium cobalt or alnico magnet or ferrite magnet
2. Grade: please click here and select from our table
3. Coating: please click here and select from our table
4. Size: drawing is needed for segment magnet
5. Magnetize or Not:
6. Magnetized Direction: please show on drawing
7. Quantity: we don't have MOQ, but price will be cheaper if you order more at a time

Magnetic Rotor Assembly and Halbach Array

China Magnets Source Material Limited is a professional manufacturer for permanent magnets, halbach array and magnetic rotor assemblies.

Our magnetic rotor assemblies feature precision and complex, including a wide variety of permanent magnets:

1. Samarium Cobalt (SmCo)
2. Neodymium Iron Boron
3. Ferrite
4. AlNiCo

Halbach array structure is one of rotor assemblies we made for customer worldwide.

What is halbach array? Description from Wikipedia: A Halbach array is a special arrangement of permanent magnets that augments the magnetic field on one side of the array while cancelling the field to near zero on the other side.

At present, the permanent magnet motor is developing toward high power, high function and miniaturization. The high power density and high efficiency are the common requirements for all types of permanent magnet motor design.

According to principle of motor design, the increase of magnetic loading is to increase the motor gap magnetic flux density, which can reduce motor size and improve the power density.

For permanent magnet motor, generally, there are two measures to increase air gap flux density in motor.

1. Change magnetic material: try to use permanent rare earth magnet with higher residual magnetic flux density. But restricted by magnet material performance and price, the actual alternatives are few.
2. Change magnet structure and arrangement

Halbach array is a new type of permanent magnet arrangement combined with radial and tangential array, which can increase the magnetic field on one side of and weakened the magnetic field on the other side.

Using Halbach array in permanent magnet motor can increase the magnetic flux in the air gap and decrease the magnetic flux in the rotor yoke, and it is most suitable for the inner rotor or outer rotor of the external permanent magnet.

In brief, its application in the permanent magnet motor has great advantages:

1. Sine wave of air-gap magnetic field
2. Good magnetic shielding effect
3. High power density
4. Light weight
5. Small in size

Neodymium magnets play a very important role in the renewable energy market. So we believe this halbach motor could find a broad range of industrial and automation applications, from electric vehicles, aerospace, independent power generation to other occasions.

China Magnets Source Material Limited has a wealth of experience in permanent magnet industry over 20 year. Please feel free to contact us if you need permanent magnets, halbach array magnets or motor rotor assembly.

We know how to:

1. Select the right magnets
2. Choose the suitable coating
3. Design optimization
4. Magnet production
5. Assembling components