Goudsmit recently manufactured two magnets for a large European manufacturer to produce iron-free carbon black. These self-cleaning rotating magnets can remove iron particles as small as 30 microns from very dry and poorly flowing conductive carbon black used in lithium-ion batteries.

The product must be 100% free of metal, as metal particles alter conductivity. In this production line, the processing capacity of the Goudsmit rotating magnets is relatively low, at 1500 kilograms per hour. However, if required, the processing capacity of these magnets can reach 40 cubic meters per hour. These magnets comply with the ATEX directive and can withstand temperatures up to 70°C. Higher temperature resistance is also possible. The rotating design ensures that poorly flowing powder does not accumulate on the magnetic rods, allowing better contact with the material and thus improving the separation rate. In this case, carbon black production is a continuous process that must not be interrupted. Therefore, two self-cleaning magnets are installed on this production line, each with a bypass. This means that at least one magnet is operating during cleaning, and both magnets are in use 99% of the time.

(Goudsmit carbon black magnets)

Carbon black

Carbon black is a very dry, poorly flowing product used in sealing and insulation materials, rubber, batteries, electrodes, paints, and coatings. Iron particles are clearly undesirable in products such as seals and batteries, so they must be removed. The magnets are located in pneumatic (vacuum) pipelines, and the rotating motion prevents bridging and clogging of the magnets. Neodymium-iron-boron (NdFeB) magnets are used, with a flux density of 9140 Gauss on the rods, ensuring that even very tiny iron particles of ±30 microns can be removed.

(Goudsmit magnets for carbon black)

Cleaning

For cleaning, the continuous product flow is redirected through a bypass. It consists of two valves that completely isolate the magnet from the process. Automatic cleaning of the rods then takes place in the product chute, and the captured iron particles are sucked out of the product chute using a lower vacuum of 0.8 bar.

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