Residual materials from shredders

Optimally process residual fractions

Optimum recycling of any material

Shredder residue fractions consist of a mixture of recyclable materials. To recover them, the input material must first be shredded. Shredder light fractions (SLF) and shredder heavy fractions (SHF) are generated in phase one. These will have very different compositions based on the input material. Both require compatible process technology in order to extract the valuable materials they contain. As one of the pioneers in residual fraction processing, BHS-Sonthofen offers optimal solutions for both SLF and SHF.

Benefits at a glance:

  • Excellent selectivity
  • High throughput rates
  • Inexpensive to operate; low energy/wear and tear costs
  • Tried and trusted technology
  • Fully automatic operation possible
  • Many references available
  • European market leader in the processing of fine fractions

Having the right technical system is critical for handling both heavy and light materials

When it comes to processing SHF and, more specifically, SLF, recycling plant operators are required to comply with increasingly strict legal regulations. This applies in particular to how shredder residues contaminated with hazardous substances need to be handled. Against this backdrop, it is all the more important to separate 100% of all recyclable raw materials, not least because this also increases the profitability of recycling. BHS experts will recommend the right system and optimum configuration for any shredding application. Whether you are talking about a single machine or the technical design of an entire plant, the solutions we develop for individual applications are tested at our in-house test center.

Shredder light fraction (SLF)

SLF Output magnetisch.tif

Shredder light fraction (SLF)

Suction is applied in the large shredder’s working chamber to separate the SLF from the SFF. It is not possible to immediately sort the SLF without further mechanical processing due to affinity (the metal particles adhere to other components).

The rotor shredder (type RS) is used to separate composites comprised of multiple materials, some of which are highly entangled. The residual fraction can then be further separated into mineral and organic components. The rotor impact mill (type RPMV) is particularly well suited for the processing of grain sizes of up to approx. 25 mm. It shapes the metallic components into pellets. This makes it possible to readily separate metal fractions from the remaining material in the next step. Components larger than 25 mm in size are processed in the universal shredder (NGU)

Shredder heavy fraction (SHF)


Shredder heavy fraction (SHF)

Shredder heavy fraction (SHF) contains a number of valuable raw materials (metals). The largest share is comprised of aluminum at up to 30%, followed by heavy metals (such as copper, lead, zinc and stainless steel) at up to 20%. The rest is made up of rubber, plastics and mineral components.

In the case of smaller screen fractions of under 25 mm, the metal yield can be increased using BHS technology. The rotor impact mill (type RPMV) cleans and pelletizes the metals. In addition, mineral components are pulverized, which acts to break down the adhesion limits. As a result, the metal fractions can be more effectively recovered during the subsequent separation process.


Efficiently processing shredder fractions


Efficiently processing shredder fractions

The BHS rotor impact mill is a high-performance crusher with a vertical shaft that addresses the needs of the recycling industry. The mill’s unique impeller rotor works together with a toothed anvil ring to subject the inserted material to severe mechanical stress. Material compounds are crushed and separated selectively, entangled materials are isolated, and brittle-hard materials are crushed very finely. At the same time, metals are shaped into balls and cleaned. Watch the video to find out how to optimally prepare shredder fractions for separation by disaggregating composite material and pelletizing metals with the RPMX rotor impact mill.

Machine portfolio

Rotorshredder (RS)

Crushing, separation and disaggregation – the rotor shredder can do it all

Rotor impact mill (RPMV & RPMX)

Ball shaper operating based on unique crushing principle

Universal shredder (NGU)

Continuous high-performance crusher for all cutting-related applications

Tests give certainty

Which technical solution is the right one for your recycling process? Don’t leave anything to chance. Our team of specialists will test your material at our test center and develop a solution tailored to your specific needs.

Success stories

Less wear for economically efficient processing of ASR

March 2019
Since March 2019, a BHS-Sonthofen rotor impact mill (type RPMX) has been in operation at Jansen Shredder Recycling BV in Moerdijk, the Netherlands, for the fine processing of automotive shredder residues (ASR). Thanks to years of experience in the processing of metal-bearing waste materials, the experts from Sonthofen found the optimal solution for processing abrasive materials. Wear costs at Jansen have significantly decreased since.

Plant for recycling automotive shredder residues (ASR) in Finland.

July 2017
Kajaanin Romu Oy operates one of Finland’s most cutting-edge plants for recycling scrap in the town of Kajaani, located approximately 500 km northeast of Helsinki. The company commissioned a BHS-Sonthofen plant for processing automotive shredder residue (ASR) fine fractions of particle sizes between 0 and 30 mm. It separates the feed material abundant with valuable metals into ‘light’ and ‘heavy’ fractions in a single pass. This allows the plant operators to economically produce fractions that can be sold profitably. Moreover, the plant significantly reduces the cost of material disposal at landfills.

Don’t let valuables end up at the dump!

January 2016
A metric ton can contain up to 20 grams of gold and up to 200 to 300 grams of silver, as well as platinum and other precious and non-ferrous metals. Heavy non-ferrous fractions of material left over after shredding and processing large automotive, electrical or electronic scrap components still hold a lot of value. Previously, the recyclable materials were deposited in landfills. Based on our unique process, BHS-Sonthofen processing plants can recover these metals.

Technical articles in the media

BHS-Sonthofen supplies rotor mill for ASR processing

June 2020
Sonthofen, Germany-based BHS-Sonthofen says a rotor impact mill (type RPMX) with chilled cast chrome wear parts has proven effective for the processing of automotive shredder residue (ASR) fine materials at Jansen Shredder Recycling BV in Moerdijk, the Netherlands.
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