Goudsmit recently built two magnets to be used for the production of iron-free carbon black by a large European manufacturer. These self-cleaning, rotating magnets remove iron particles as small as 30 microns from the very dry, poorly flowing conductive carbon black used for lithium-ion batteries.It is essential that this product is 100% metal-free, because metal particles would change the conductivity. In this line, the rotating magnets process at a relatively low capacity of 1500 kg per hour. If necessary, however, such magnets can process at capacities of up to 40 m3 per hour.
The magnets are compliant with the ATEX standard and are resistant to temperatures of up to 70 °C. Higher temperature resistance is also possible. The rotating design ensures that the poorly flowing powder does not accumulate on the magnetic bars and they come into better contact with the material, thereby improving the separation rate. In this case, the production of carbon black is a continuous production process that must not be interrupted.
Therefore, two self-cleaning magnets - each with a bypass - have been placed in this production line. This means that at least one magnet is in operation during cleaning and both magnets are in use 99% of the time.