Across industries, the filter separates weakly magnetic particles untouched by other magnetic separation technology
Bunting Group, a developer and manufacturer of magnetic separators, has unveiled the Electromagnetic Wet Filter with an ultra-high intensity background magnetic field of 3,500Gs to 10,000Gs.
Useful for the ceramics, mineral processing and recycling industries, the filter’s high-intensity magnetic field separates paramagnetic materials from liquids and slurries. In mineral processing, for example, it is necessary to remove fine grinding iron and materials such as hematite that are found in nonmagnetic minerals.
Separation procedures are also necessary for cleaning wastewater by removing iron and scale, a process occurring in steel production, power stations and water recycling plants.
“The new Electromagnetic Wet Filter solves a high-intensity magnetic separation problem for liquids and slurries,” said Bunting’s European technical director Adrian Coleman.
“In ceramics, successfully removing any magnetic particle significantly reduces reject rates and rework costs. Having the ability to process non-metallic minerals in a wet state saves on drying costs and enables higher removal levels of magnetics. The new Electromagnetic Wet Filter answers many wet magnetic separation questions.”
The Electromagnetic Wet Filter generates significant background magnetic field strength in the cannister, measuring either 2,500Gs, 5,000Gs or 10,000Gs. This combined with the high magnetic field gradient on the matrix surface enables the filter to produce a higher separation efficiency than permanent magnetic and smaller electromagnetic separators.
The enhancement of the magnetic field on the matric surface is two to three times the background field, meaning a 5,000Gs background will generate 10,000Gs to 15,000Gs on the matrix, for example.
The filter comprises an energy-efficient, electromagnetic coil designed to maintain thermal stability while generating high Gauss values. The coil is wrapped around a hollow core containing a 400-series magnetic, stainless-steel matrix that comes in various designs.
The coil is enclosed in a casing that strengthens the magnetic field into the coil’s centre. The coil generates a high-intensity magnetic field that intensifies on points of the matrix, creating the magnetic force required to separate paramagnetic particles from liquids or slurries.
Valves trees are positioned on the top and bottom for the product to flow through, as well as cleaning water and air.
Once the magnetics have been captured, they can be removed manually or automatically. Automatic removal is done through a separate control containing a Siemens S7-1200 PLC incorporating Siemens HMI. Operators can control the frequency and parameters of the matrix cleaning process.
During removal, the directional flushing system enables maximum removal of captured magnetics and paramagnetics. Additional cleaning is possible due to the filter’s built-in jig, which allows for the removal of the matrix, poles and canister. A separate transformer rectifier is used to deliver power.
