Aluminium 2018 Trade Fair in Düsseldorf

STEINERT’s Latest Laser Induced Breakdown Spectroscopy for Sorting Aluminium

STEINERT GmbH recycling aluminium waste optical sorting

German waste sorting equipment manufacturer STEINERT has started operations of the first industrial Laser Induced Breakdown Spectroscopy (LIBS) system for separating aluminium scrap alloys.

The solution deployed will be on show at the “Aluminium” trade fair in Düsseldorf from 9-11 October this year in hall 11, stand 11H60

The company explained that purity is currently the primary objective when it comes to recovering secondary raw materials - and not just since China’s U-turn on stopping imports of low-quality metals.

The Cologne-based sorting specialist said that by introducing the first LIBS sorting system in Europe, it is bridging a crucial gap for its customer, an aluminium recycler, which will be able to use even more secondary scrap.

Returning aluminium to recycling circuits requires pure fractions which processors can only manufacture on a step-by-step basis. The recycling process initially involves the separation of ferrous and non-ferrous metals – both of which are STEINERT said are possible with its magnetic separation technology.

However, the manufacturer went on to explain that the next step in the process involves the key technology: X-ray transmission separates heavy metals from light metals. This produces defined, clean aluminium mixtures. The STEINERT XSS T has been tried and tested in this area for years.

Nowadays, the combination of multiple sensors with X-ray transmission technology in the design of the STEINERT KSS is in demand to achieve an even greater sorting depth.

It consists of a platform which deploys various sensors such as 3D, colour and induction recognition. The system can also be supplemented with a fourth sensor (near-infrared, X-ray transmission or X-ray fluorescence sensor).

To recover the ZORBA fraction – the mixture of light and heavy metals – materials are separated using methods including X-ray technology into aluminium and the group fraction of copper, brass, zinc, etc.


According to the company, the missing link for aluminium recyclers, which separates pre-sorted aluminium scrap into its alloys, has been put into operation for the first time.

The specially designed STEINERT LSS line sorting system enables the customer to separate multiple alloys with just one detection by the LIBS sensor. LIBS is a technology used for elemental analysis.

By default, the calibration methods stored in the measuring device analyse the concentrations of the alloy elements Cu, Fe, Mg, Mn, Si, Zn and Cr.

The sorting of alloys involves first separating the shredded material mixture in such a way that the material is fed past the laser so that the laser pulses hit the surface of the material. This causes tiny particles of material to evaporate.

The emitted energy spectrum is recorded and analysed simultaneously to detect the alloy and the specific alloy components of each individual object. Different materials are detected in the first part of the machine. Compressed air valves then shoot these into different container in the second part of the machine, depending on their elemental composition.

“The demand for this sorting method, which is up to 99.9% accurate, is increasing – our order books are filling up already. The separation of the material and the multiple outputs are of primary importance for our customers,” said Uwe Habich, Technical Director of STEINERT.

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