supersort® and supersort®fine use dry-mechanical process for the conditioning of municipal solid waste incinerator bottom ash. It recovers metals and organics and bring them back into the resource cycle.

supersort® is a dry mechanical recycling plant and reaches with up-to-date technologies a high recovery of valuable products such as ferrous and non-ferrous metals, stainless steel and Cu-Fe ‘meatballs’ from MSWI bottom ash. Developed by DHZ, supersort®fine is an innovative process for the treatment of MSWI bottom ash particles < 3 mm. The technology enables the recovery of metals out of the fine fraction that usually is directly landfilled. Given that the sieves in standard Screening machines tend to clog with damp material, supersort®fine uses a different technique. The supersort®fine acceleration machine achieves a coarse fraction with a higher percentage of heavy metals than in the primary bottom ash. The coarse fraction runs through an eddy current separator and ends up as a high-grade, highly valuable metal concentrate. Together with a Swiss equipment manufacturer, DHZ recently embarked on the commercialisation of its supersort®fine pss machine.

The generated non-ferrous metal concentrates are cleaned and sortetd to pure non-ferrous metals in the plant supersort®metal in Oberglatt.

The mineral fraction with a low metal content is landfilled in compliance with Swiss regulations. The recycling plant processes over 120 000 tons of bottom ash per year. A major advantage for the legal disposal of the mineral residue fraction and especially for logistics is the plant’s convenient location next to the Häuli landfill in Lufingen.


The schematic illustration of the processing of the bottom ash:

See below for more information about materials and the construction of the plant:

Materials Development


supersort®metal is a dry-physical process for purifying non-ferrous metal concentrates, shredder residues and other metal containing wastes

With the goal of enhanced metal recycling, DHZ commissioned the supersortmetal plant in September 2016. The new plant purifies non-ferrous metal concentrates from supersort, supersortfine and other MSWI bottom ash treatment plants to create high-grade metal fractions. Using different dry mechanical separation processes and state-of-the-art technology, it separates the concentrates into light non-ferrous metals and heavy nonferrous metals. The unique plant closes the gap between smelters and conventional bottom ash treatment installations, yielding pure metal fractions which can be processed directly by smelters.

The supersortmetal process recovers metals efficiently and produces consistently high-quality secondary raw materials. The light metal fractions contain mainly aluminium and aluminium alloys while the heavy fraction is a mixture of copper, brass, zinc, stainless steel and lead, but also contains precious metals such as gold and silver. The resulting non-ferrous metals are dry and boast a metal content of more than 98%.



  • Non-ferrous concentrate from supersort® and supersort®fine

  • Non-ferrous metals from recycling plants

  • Shredder light fraction (SLF)

  • Shredder heavy fraction (SHF)

  • Other metal-containing waste

Operation figure:

  • Launch summer 2016

  • Processing line I: 8 – 100 mm

  • Processing line II: 0 – 10 mm

  • Max. productivity per year: 100’000 mt (3 shifts a day)

  • Dedusting: > 300’000 m3/hr

supersort®fine pss

treatment of the fine fraction

supersort®fine pss starts, where the conventional treatment of the bottom ash ceases. The fine fraction of the bottom ash (< 5 mm) contains a high potential for the recovery of metals. In this fraction, the valuable heavy metals, but also precious metals such as silver and gold, are present in an increased concentration compared to the coarser fractions. In conventional bottom ash treatment plants, this fine fraction is not process further, but deposited directly. Thus, up to 50% of the non-ferrous metals are lost based on the input. The challenge in the processing of the fine fraction is, among other things, the classification of the fine and moist bottom ash. Where screening is no longer possible, supersort®fine pss will be used for the classification and preparation of the fine bottom ash fraction. Since 2014 DHZ AG has using this technology with supersort®fine reliably and successfully on an industrial scale.

Anlage supersort®fine pss 02

result: a high quality non-ferrous metal concentrate

The innovative method utilizes the different throwing distances in the acceleration of particles with different sizes and densities. In this way, the patented process supersort®fine pss achieves a coarse material enriched with metals. This is then further concentrated on a specialized eddy current separator. The result is a valuable non-ferrous-metal concentrate with a high proportion of heavy and precious metals which can be further refined and a residue fraction strongly depleted of metals which can be deposited.

everything from one source

With a Swiss partner, DHZ AG offers the unique supersort®fine pss process on the market, thus enabling everyone the economic recovery of the metals from the fine fraction of bottom ashes smaller than 5 mm. We determine for you the potential of the fine processing, take over the planning and construction of the new treatment plant and look after you, competently and reliably during the operation. Contact us for a non-binding consultation and use our unique know-how in the fine processing of bottom ash.

advantages supersort®fine pss

  • additional revenue through higher recovery of the metals from the fine fraction with a ghigh proportion of precious metals (gold, silver,…)

  • reduction of the environmental impact of treated bottom ash during landfilling or when used as a building material due to the lower metal content in the residue

  • classification of sticky and moist material

  • separating cut of the classification variable between 0,5-2 mm

  • everything from a single source: with your bottom ash sample, we analyse the potential of metal recovery, elaborate a rough concept for fine preparation and a business plan and take over the planning and construction of a new processing plant


In the future, an increasing amount of valuable metals like heavy and precious metals will exist in the smaller grain sizes. supersort®fine pss enables the recovery of metals down to a grain size of 0.5mm.

Grafik pss02

The fine fraction of bottom ash contains metals which
are usually not processed. supersort®fine pss, the
dry-mechanical process for fine bottom ash, enables you to increase the recovery rate up to 50 %.

Grafik pss03

The ballistic method is a simultaneous sorting by size and density. The residue fraction below 0.5 mm is removed and a metal-enriched coarse fraction is produced.


The primary duties of the supersort®lab are the analysis of the input materials, the process monitoring, the quality management of the products and the support of the further development of the supersort®technology.

Our lab is specialized in the analytics of metals in waste streams such as bottom ash, ASR and other metal-containing waste. Besides the determination of particular parts of non-ferrous metals with the help of selective crushing, magnet-, density- and hand-sorting, we also use the latest XRF-technology. The XRF-technology allows the measurement of the elementary composition of a sample within the one-digit ppm-range which gives us the possibility to detect the content of precious metals. Our experienced and well educated lab technicians work with great accuracy and reliability.

Bild Giessen

Standard material examinations

Incoming material analytics

Every delivery for the supersort®metal-plant is first checked for radioactivity according to the SUVA regulations. A sample of the delivered material is taken afterwards according to LAGA PN 98 and is checked for material moistness. A retained sample is stored until the complete processing of the order.

Process monitoring

Production samples are taken from our plants supersort®, supersort®fine and supersort®metal on a regular base. With our constant process monitoring, a high product standard is guaranteed.

Quality management
of our products

To find the right customer, the quality of all our products is consistently checked.

An overview of our possibilities

  • Sample preparation: From taking a sample to splitting, homogenization, and crushing

  • Particle size distribution through sieve-classification (wet/dry)

  • Determination of material moistness

  • Classification of particular metal contents with the help of selective crushing and hand-sorting

  • Density-sorting with a heavy-solution

  • Crushing with jaw- or drum-breaker

  • Smelting of samples

  • Measuring the elementary composition with XRF-technology

The technics and the possibilities of our lab are consistently improving and will be extended on demand.

Movies about supersort®

supersort®metal the movie

Impressions of the supersort® plant

supersort®fine pss fine treatment