53recyclinginternational.com | May/June | 2020
TECHNOLOGY EXPERTS
TRS helps Swiss partner make the
most of incinerator bottom ash
TRS, a specialist in turnkey sys-
tems for incinerator bottom ash
(IBA), has just completed a new
treatment and metal recovery
plant for a customer in
Switzerland.
AIB Deponieanlage Elbisgraben’s site
near Basel has a capacity of 30 tonnes
per hour. The goal of the project is to
reduce all IBA material to an end-frac-
tion of less than 5mm and to recover
as many metals as technically possible.
TRS points out that Switzerland for-
bids the use of bottom ash for road
construction and other applications.
Even when it is landfilled, the material
must not contain more than 1% non-
ferrous metals. The new recycling
plant achieves a value under 0.22%.
How does it work?
The unprocessed and pre-conditioned
IBA is loaded into a bunker where
fractions greater than 250 mm are
separated on a tilting grid before the
fraction smaller than 250 mm is sieved
at 40mm. The fraction from 40-250
mm continues to an electromagnet
and manual sorting cabin for the
recovery of ferrous, non-ferrous, stain-
less steel, copper coils, unburned and
mineral components.
The 0-40mm fraction is further sieved
at 5 mm, creating two fractions to
achieve optimal metal recovery using
the latest spreading and metal recov-
ery techniques. These include active
clean vibratory feeders, low intensity
magnetic separation and high intensi-
ty eddy current separation.
Immediately after sieving, the 5-40mm
fraction is treated by an electro over
band magnet to take out clean ferrous
and is then processed by an active
clean vibratory feeder. After that, the
eddy current recovers non-ferrous
metals that are directed towards the
metal storage bay.
More separation
The remaining mineral fraction from
the eddy current is forwarded to an
impact crusher, releasing more metals
that are bound with minerals and
cleaning any stainless steel not sepa-
rated by the conventional magnets
and eddy current. The crushed materi-
al is then looped back into the 5 mm
sieve and sent back to the non-ferrous
metals separation stages.
The stainless steel parts, mostly
between 5-40 mm (including bigger
pieces such as cutlery) travel through
the plant until being released into a
container by a reversing conveyor
belt.
The 0-5 mm fraction is separately for-
warded into a ‘waterfall’ distribution
and separation set-up, consisting of
an active clean vibration feeder to
ensure the best possible separation,
both on the low intensity magnetic
separator module and in the 2 000
mm wide high magnetic density and
frequency eddy current separator.
This results in a clean and smaller IBA
fraction to be sent to landfill.
Fotobijschrift
kaderkop
??
For more details, check:
www.trs-nl.com
53_bottomashrecycling.indd 53 15-04-20 15:30
