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Feb 28, 2025

Bunting Develops High-Intensity Electromagnetic Dry Filter | Engineer Live

Industrial equipment supplier Bunting has introduced an electromagnetic dry filter to remove free fine iron from powders. Generating an ultra-strong magnetic field, the high-intensity magnetic

Industrial equipment supplier Bunting has introduced an electromagnetic dry filter to remove free fine iron from powders.

Generating an ultra-strong magnetic field, the high-intensity magnetic separator captures ferrous particles present in fine materials that are difficult to process.

“Processing powders is often challenging due to the way in which the materials behave,” said Bunting’s technical director Adrian Coleman.

“Our design engineers considered these challenges when designing the electromagnetic dry filter, focusing on good powder flow, whilst maximising magnetic separation.”

The technology intensifies the magnetic separation in various applications in mineral processing, chemical and pharmaceutical production, recycling and ceramics.

The electromagnetic dry filter is especially suitable for the magnetic particle purification of high-value fine powders, especially when process and produced in controlled batches.

A vibrating cannister is located inside the filter’s electromagnetic coil, generating 3,500G to 5,000G. This is then concentrated on the points of the matrix to reach peaks of up to 12,000G.

Fine powder flows under gravity through the vibrating canister, which is filled with magnetic stainless-steel matrix while the electromagnetic dry filter is in operation. The matrix attracts magnetic particles and holds them until the batch feed is stopped.

The electromagnet is then turned off, releasing magnetic particles into a separate waste collection area.

The matrix features ultra-high magnetic fields and multiple magnetic capture points that support enhanced separation of magnetically susceptible particles.

Traditionally, many rare earth magnetic separators struggle due to particle size and shape, electrostatic charges and environmental factors such as humidity.

Bunting’s electromagnetic dry filter, however, suffers fewer problems with bridging, ratholing and poor flowability than many rare earth magnetic separators. Using permanent neodymium rare earth tube magnets, the filter’s separation efficiency is higher than permanent magnetic separators.

The process times and integration of the electromagnetic dry filter into a production line is conducted through a separate control featuring a Siemens S7-1200 PLC and Human Machine Interface (HMI) control.

To simplify maintenance and minimise production downtime, the electromagnetic dry filter has a built-in jig crane to remove the matrix canister for cleaning or inspection.