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changing pole configuration or with rotating vertex. Although, due to cost
reasons these technologies are used only rarely.
Figure.23.: Magnetic Separation
If the fine fraction of the waste material is to be biologically treated a widely
separation of ferrous metals <strong>and</strong> combined materials is necessary. Due to the
difficult material conditions a recovery of 95% is not possible in many cases.
Furthermore, a lot of combined materials based on metals can be found such as
batteries which cannot be separated using conventional magnetic fields.
(Wastesum.,2010)
4.6.6. Eddy-current separation (Non Ferrous Materials)
The most important non-ferrous metal contained in household waste material
is aluminum which can be found in the form of cans, different packaging or e.g.
as bottle caps. The eddy current unit (Picture 8.) operation separates aluminum
products from other nonmetals. An aluminum separator employs either a
permanent magnetic or electromagnetic field to generate an electrical current
(eddy), which causes aluminum cans (nonferrous) to be ejected <strong>and</strong> separated
from other materials. Eddy current separation is based on the use of a magnetic
rotor with alternating polarity, spinning rapidly inside a nonmetallic drum
driven by a conveyor belt.