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A problem in the domain of carbon black processing was a good reason for Goudsmit Magnetic Systems BV, which is established in Waalre, to develop a new design of the
rotating clean-flow magnet. The leading company in the Netherlands in the field of carbon black processing wanted to separate the pearl-shaped carbon black stream from iron parts. The company outlined three problem situations which could not be solved by using a normal clean-flow magnet. The renewed design provided a solution. This design can be seen in the Powtech 2007 in Nürnberg (hall 9, booth 316).

Situation

Carbon black is a very dry product which is not flowing well and it is used in sealing and insulation materials as well as in car tires. Naturally iron parts in the seals are not wanted and must be removed. A few problems arise when using a normal clean-flow magnet. The pellets stuck to the bars or pulverised on the bars, which was due to the height of fall. For quality control purposes it was also necessary to analyse the collected iron parts and to take samples for research in the company lab. Moreover the temperature rose to over 100°C during production which led to a reduced magnetic force. Carbon Black is polluting to such a degree that cleaning the magnets must be done automatically.

Solution

The solution of the outlined problems was to bring a very strong finish to the plate material (RA, value 0.4) which was achieved by electrolytical polishing. Moreover Goudsmit developed mechanical sc