Magnets are objects that creates magnetic field. The magnetic field produced by the magnets varies from magnets to magnets. Magnets are manufactured artificially and are also found in nature.
Magnets are manufactured in various size and strength for various applications. They are used as pulleys, lifting device, handlers, chucks, stirrers etc in various industries. There are different types of magnets that are used for various purposes. The popular magnets that are used for various industrial applications are neodymium, samarium cobalt, ferrite, ceramic, electro magnets, funnel magnets, pot magnets, rare earth magnets, rubber magnets, sheet magnets etc.
These magnets are used for various industrial applications which are as follows:
Mining and Mineral Industry
Devices that are popularly used for removing ferrous contaminants from the minerals are various types of magnetic separators. Following are the magnetic separators that are used widely in mineral and mining industry:
Wet Drum Separators
Wet drum separators are widely used magnetic separators used in mineral industries especially in coal mines. They are infact used to recover ferro silicon or other magnetic fines in dense media plants. They enhance both the plant productivity and product purity by removing contaminants. Wet drum separators can even remove very fine and weak contaminants even from dense materials. Due to this they are useful in those applications where product purity is given prime importance.
Drum Magnets
Drum magnets are used for removing ferrous contaminants from a wide range of free-flowing bulk and granular materials in high-volume applications. Minerals like coals, mica etc consist of many other ferrous and non ferrous fine. These ferrous fines are captured by the the magnetic assembly which is inside the unit's shell. After the contaminants are removed, the cleaned product falls freely to a discharge point. There is a cleat that sweeps the ferrous debris through and out of the magnetic field.
Over Band Magnetic Separator
Overband magnetic separators are quite similar to the suspended magnets which are fabricated and configured to trap and hold the tramp metal from the product carried by the conveyor. The magnets that are used in these types of separators are either ceramic or powerful rare earth magnets.
Overband magnetic separators are housed in stainless steel structure. They can be installed either above or below the passage of material flow. Due to their versatility and productivity , they are utilized in various mining and mineral industry.
Suspended Plate Magnets
In suspended plate magnets, from free flowing granular products metallic contaminants usually tramp iron are pulled up. The contaminants are collected on the self cleaning magnetic separator belt which are discharged through hopper. The occasional tramp iron materials are removed by suspended magnets from conveyor belt, vibratory feeder or gravity chute.
Food and Pharmaceutical Industry
Food and medicines are directly related to your health hence extra care is needed during there processing. The product stream, both in the pharmaceutical and food processing industry must be protected from being contaminated by tramp iron materials. There are wide range of equipments that can detect and separate metal contaminates to result in purified product stream. Products that are extensively used in these industries are as follows:
Bullet Separator
Bullet separators are efficient magnetic separators that are used for extracting iron particles from within a pipeline and gravity feed chutes. In bullet magnet system there are circular or conical core. These cores contain powerful bullet shaped strontium ferrite or 'rare earth' magnet. When the materials flow over the bullet magnets, the ferrous fines are attracted towards the surface. These magnets are both easy to clean and install and are helpful in guaranteeing product purity and plant productivity.
Magnetic Tubes And Grids
Many food processing and pharmaceutical industries are benefited by the Grid magnets and tube magnets. Magnetic tube and grid magnets are manufactured from ceramic or rare earth magnets. Grate magnets are usually installed installed in hoppers, chutes and ducts to benefit mainly food processing and ceramic industry.
Magnetic tubes is capable of capturing any ferrous contaminants that pass through it. The magnets that are used for making magnetic tubes are Alnico, Ceramic or Rare Earth magnet material. As per requirement they are available in various lengths and breadths.
Magnetic Drum Separators
In high volume applications, Magnetic drum separators are used. From free-flowing bulk and granular materials, these magnets remove ferrous contaminants. The contaminated metal is discharged separately thereby making cleaning continuous operation. The advantage of magnetic drum separator is that it provides a larger operating surface thereby increasing the through put rate of materials. Due to its high functionality, agriculture industry uses totally enclosed drum separator for metal contamination protection in the feed of grain.
Plate Magnets
Plate magnets are normally installed within a chute or over a conveyor for the food and ceramic industry. They are installed to separate products from contaminated particles. Plate magnets have magnetic stainless steel poles and are usually constructed from a magnetic stainless steel casing. These plate magnets can be made up of neodymium iron boron or similar rare earth materials for specialized applications like the removal of fine iron from powders.
Magnetic Pulley Separators
Magnetic pulley separators are considered as one of the most reliable solution to the problem of continuous ferrous extraction from the product stream. Magnetic pulley separators are installed at the discharge end of a conveyor, as a replacement head pulley.
Plastic and Glass Manufacturing Industry
In order to give product a good quality base, it is must that all the impurities should be removed from the basic raw materials. Various types of raw materials are used for making glass and plastics. These raw materials are first cleaned by subjecting them to various types of magnetic separators that pulls ferrous fines and other contaminants from the raw materials and made them fit for production of final goods.
Disc Separators
In disc type of separator feed material is discharged to a vibratory feeder tray, from a hopper. Transportation of the materials take place beneath the rotating discs. Magnetic particles after reaching the magnetic field of the disc gets attracted to the high gradient magnetic zones on the discs. The captured particles are carried to the discharge chutes by the rotating disc. The secondary and final separation of the materials take place in the second and the third zone of the machine and then finally the cleaned materials are discharged out of the machine.
Induced Roll Magnetic Separator
In induced magnetic roll separator, material being treated is fed from a hopper or vibratory feeder at a controlled rate onto a high intensity magnetic roll. The magnetic particle present in the materials attach themselves onto the roll face whereas non magnetic material is thrown off the face at a normal trajectory.
Rare Earth Roll Separators
Rare earth roll separators consist of the most powerful rare earth permanent magnet like Neodymium Iron Boron magnets thereby transforming it as a high intensity and a high gradient separator. These separators can extract both ferromagnetic and paramagnetic materials. This enables the separator to create a cleaner product with no metal contamination.
Ceramic and Powder Handling Industry
Different types of magnetic separators like drum separators, plate magnets , suspended magnets etc. are used for separating small powdery substance from magnetic fines. Ferrous fines when enter into the magnetic fields of the separator gets attracted towards the magnets and the purified materials are collected separately.
Configuration of different magnetic separators are different though their functions are same. Suspended magnets are installed above the conveyors whereas plate magnets are installed within a chute or over a conveyor.
These magnets are also used for manufacturing various types of industrial products like:
Electric motors
Electric guitar pickups
Sensors
Loudspeakers
Automotive and electronic sensors
Actuators
Hall effect sensors
Magnetron
Reed switches
TWT amplifiers
Communication
Vehicle signage
Shelf and bin marking
Craft, hobby, and toys
Industrial automation equipment
Transformers
Rotating transformers
Pulse transformers
本文转自：China Industry News
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