High Intensity Magnetic Filters
Eriez High Intensity Magnetic Filters
The magnetic collection of fine particles requires a high-intensity, high-gradient magnetic field. An electromagnetic matrix-type separator, referred to as a magnet filter, has proven to be the most effective method of separation. This type of separator utilizes a high-intensity electromagnet and a flux-converging matrix. The matrix amplifies the magnetic field and provides high-gradient collection sites for the magnetic contaminants.
A line of permanent magnetic filters is also available.
Features:
- Easy cleaning
- Various sizes and magnetic field strengths
- Increased magnetic strength
- Electro and Permanent models
- Custom designs available
Principle of Operation
The electromagnet filter consists of a solenoid coil encased in steel. The coil generates a uniform magnetic field throughout the bore. A stack of expanded metal discs (termed matrix) is packed in the bore of the coil and is induced by the magnetic field. A typical matrix will consist of 20 to 40 medium-grid (1/4 inch [6mm), 18 gauge) expanded metal discs reaching the height of 6 inches (152 mm). The matrix amplifies the background magnetic field, produces localized regions of extremely high gradient, and provides the collection sites for paramagnetic-particle capture. As feed material filters through the matrix, the paramagnetic particles are captured and consequently removed from the particle stream.
The filters are rated by the magnetic field strength generated in the bore of the solenoid coil with the matrix removed. This background magnetic field represents the driving force that produces the amplified high gradient throughout the matrix. Dependent on the matrix configuration, it is typically the case that a 2500-gauss background field will result in an excess of 10,000 gauss in localized regions of the matrix. Filters are available with background magnetic fields ranging up to 10,000 gauss.