“Without a doubt, it’s paid off”

Magnet and sensor-based processing technology for incineration bottom ash

STORK is celebrating its 25th anniversary in 2019 and adding state-of-the-art magnet and sensor-based processing technology for incineration bottom ash to its Leipzig site. Given the company’s aim to recover metals and return them to the economic cycle, after five collaborative plants, the decision has now been made to construct the first plant equipped by sorting specialist STEINERT alone. It is fitting that, as STORK celebrates its 25th anniversary, STEINERT is supplying the company with the 25th non-ferrous metal separator.

With an annual capacity of 250 000 t of mineral waste from waste incineration plants and a throughput of 140 t/h, the plant is the largest of its kind in the Leipzig economic area. 11 STEINERT machines facilitate effective metal recovery in the form of a non-ferrous metal concentrate in grain sizes of 2 mm and larger. This is then separated further in a sink/float procedure. As well as mature magnet technology, seven non-ferrous metal separators and sensor-based sorting technology is used in this process. But innovative technology alone isn‘t the solution.

According to Stork, “STEINERT has recognised that we are a special kind of partner – and we see that.” “Of course, we don‘t always agree but their guys get on with my guys. This then automatically boosts business, something which isn‘t the case with many other companies.”

The two companies have been working together for 15 years. During this time, STORK and STEINERT have been able to learn a lot from one another and STORK has become a slag and metal recovery specialist. “We started to get into metals at the end of the 1990s with crushers, screening units, air separators and one non-ferrous metal separator as best we could.” After many modifications, they started to work with STEINERT. Stork adds, “and then of course we learnt that there is more inside than we realised and we built a second plant,” later adding one of the first sensor-based plants for recycling stainless steel. Now, STORK recovers 21 t of aluminium and 4 t of copper a day from slag. “But despite that, we‘re still just getting started. There has been great progress over the last ten years but there is still massive untapped potential. We definitely expect a lot to change.” In fact, growing demand for metals seems to be inevitable. Projections are forecasting a doubling or in some cases tripling of demand for metals by 2050. To reduce the resultant impact on the environment, especially in the form of greenhouse gas emissions, recovering metals from ash is just one of the many aspects being discussed in finding a solution to this dilemma.

For STEINERT, close collaborations and support are essential elements of the company philosophy, from which all parties benefit. For example, the two companies spent a lot of time working together to program new sensor systems, but also important impulses were given which proved valuable when implementing scrapers designed specifically for ash systems. “Especially at the start, we got huge amounts of test material from STEINERT and this gave us totally different approaches to tackling problems. We learnt an awful lot during that time and without a doubt, it’s paid off. It was the right thing to do.” The company still sends staff on STEINERT training courses and to the STEINERT test centre to learn more about the latest innovations and applications.


“We are thinking long-term”

With great foresight, STORK gained approval for mobile plants for processing slag and ash in 1997, meaning that they could plan a major investment in Leipzig with just a minor approval process. Therefore, just in time for the anniversary year, STORK has opened its third plant in Leipzig for processing ash and slag – the third largest after Berlin and Magdeburg – and for the first time ever, has only used STEINERT technology in its process. “Taking account of the experience we have gained from five collaborative plants, we decided to construct the new one with STEINERT alone.” This will ensure cost-effective and efficient recovery of non-ferrous metals using eddy-current technology and of stainless steel using sensor-based sorting technology.

The foundations for the next 25 years of company success have been laid and new challenges are already in sight. “For me it’s hard to imagine ever not investing in this vision,” and in these new areas of work STEINERT, with its 130-year history of developing innovative technologies, and its international subsidiaries will be a reliable partner and will always be able to offer a solution thanks to its magnet and sensor sorting technology in waste and metal recycling as well as mining.


STEINERT EddyC family

The design of STEINERT EddyC combines both tried-and-tested and innovative elements in the separation of non-ferrous metals.

Eccentrically mounted magnetic pole system

Self-supporting frame construction for rapid belt replacement

Grain sizes of 0.5 to 40 mm

Fine pole system with maximum change in polarity at a rotation speed of 4000 rpm

Horizontally and vertically adjustable splitter blade


The STEINERT ISS induction sorting system is the perfect addition to magnetic sorting and eddy-current separation for recovering residual metals from a mix of materials.

Proven technology for separating all metals

Two sensor types with different resolutions to adapt to your specific scenario

Grain size of 1 to 200 mm


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