US Patent: US8.056.730 (B2)

Unlike a traditional head pulley magnet, the magnetic head pulley of the Dynamic SRP does not drive directly the belt of the separator but rotates inside a shell that rotates at a slightly higher speed than the magnetic pulley. Variable Frequency Drives (VDFs) allow to control the speed difference between the magnetic head pulley and belt.

Non-magnetic material travels at the speed of the belt while magnetic material feels a breaking action resulting from the slower speed of the floating magnetic pulley. The result is a liberation action of the magnetic material from the non-magnetic one and magnetic material being deviated by the separator in a much wider and open flow with respect to a traditional head pulley magnet with the lightly magnetic material (waste) dropping first and the good ferrous dropping last. In order to further clean the valuable fraction of ferrous that drops last, this fraction is passed on a permanent drum magnet that will extract from the distance the valuable ferrous. Both the inclination of the slide to the permanent magnet drum and the position of the drum are adjustable in order to accommodate for material size and purity requested for the ferrous. The use of the SGM Dynamic SRP has some limitations in case of wet material.




Car Shredder

Auto Shredder Residue (ASR)

Incinerated municipal waste

Municipal solid waste incinerator ash (IBA)


Electronic scrap (WEEE)


Wood waste

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