Sensor-based sorting for metals

1What a sensor sorter does on a metals line

An eddy current separator throws conductive non-ferrous metal as a group (how it works). It barely moves stainless steel: Goudsmit gives stainless steel a conductivity-to-density ratio of about 0.18, against about 13.7 for aluminum. Source: Goudsmit, What determines the separation efficiency of eddy current systems, undated.

A sensor-based sorter works piece by piece. Material is spread across a fast belt or a chute, a sensor reads each piece, and the pieces it selects are ejected, by air jets or a mechanical ejector. Sources: STEINERT, Induction sorting system, undated; Sesotec, VARISORT brochure; Kelly and Apelian, 2016.

That leaves sensor sorters two jobs after the separator:

• Refining the separator's product. Taking heavy metals and dense cast pieces out of shredded non-ferrous metal, splitting copper from brass, sorting wrought aluminum by alloy, and taking non-can items out of a can stream.
• Recovering what the separator missed. Pulling stainless steel, wire and small metal out of the separator's residue.

Sources: STEINERT, Aluminum recycling, undated; STEINERT, Induction sorting system, undated; PNNL and Argonne, 2025; GBB for CMI, 2020.

Each sensor reads one kind of property, so the sorter to use follows from what has to be split from what. Section 2 sets the sensors side by side, and section 3 shows where each sits in published lines. Eddy current separation against sensor-based sorting compares the two technologies directly.

2Which sensor reads which property

Cameras, X-ray fluorescence (XRF) and laser-induced breakdown spectroscopy (LIBS) read the surface of a piece. X-ray transmission (XRT) reads through the whole piece instead; STEINERT says that makes it insensitive to surface dirt and able to find heavy metal inside aluminum pieces. Sources: PNNL and Argonne, 2025 (cameras, XRF); STEINERT, KSS XF L (XRF); Araujo-Andrade et al., 2021 (LIBS); STEINERT, XSS T EVO 5.0 (XRT).

Induction sensors

An induction sensor sets up an electromagnetic field and detects any piece that conducts electricity. STEINERT states a sensitivity well under 1 mm for its induction sorter, which takes pieces of 1 to 200 mm (1 to 20 mm on its fines model) on belts 600 to 3,000 mm wide. Source: STEINERT, Induction sorting system, undated.

So it finds metal the eddy current separator left behind, stainless steel included. STEINERT presents its induction sorter as an addition to magnets and eddy current separation, to recover the metal left over: either as a concentrate such as Zurik, a stainless-rich grade (section 6), or to leave a residue under 1% metal, for example for recovered fuels. In their 2020 review of bottom-ash plants, Šyc et al. report that induction sorting detects all metals in pieces over about 4 mm, with recovery and grade that can exceed 90%, provided the material is spread in a thin layer. Binder+Co says the induction sensors on its CLARITY metal sorter take Zurik out of eddy current drops: the material the separator drops rather than throws. Sources: STEINERT, Induction sorting system; Šyc et al., 2020; Binder+Co, CLARITY metal sorting, undated.

Telling one metal from another takes more. STEINERT offers an image-processing option that tells stainless steel, cable and circuit board apart. MSS says its MetalMiner, built with tightly spaced induction coils, sorts ferrous, non-ferrous and stainless steel down to 1 mm, on a belt or a slide. Sources: STEINERT, Induction sorting system; MSS, MetalMiner, undated.

X-ray transmission (XRT)

A dual-energy XRT sorter sorts by atomic density, read through the whole piece. On aluminum its main job is Zorba, the shredded non-ferrous metal an eddy current separator makes. Heavy-media plants float aluminum away from copper, zinc and lead in a bath made dense with magnetite or ferrosilicon powder. Kelly and Apelian describe XRT making the same split dry, on a belt, with air or mechanical ejection. For profiles and light aluminum scrap, STEINERT presents dry XRT as an alternative or an addition to the wet process. Sources: Kelly and Apelian for the Aluminum Association, 2016; STEINERT, Aluminum recycling, undated.

TOMRA says its XRT sorter also takes magnesium out of aluminum, across Zorba sizes of 5 to 120 mm. In the same 2020 release, TOMRA put US Zorba at about 2 to 4% magnesium, against domestic secondary smelters wanting well below 0.5%. Source: TOMRA, 2020 release, as reprinted by WENDT.

STEINERT's XRT sorter takes pieces of 5 to 200 mm on belts 1,000, 1,200 or 2,000 mm wide, and STEINERT's aluminum page claims aluminum purity of up to 99.8% (elsewhere on the same page, more than 99.8%). Pellenc ST says its XPERT, also a dual-energy XRT sorter, separates metals by density and sorts aluminum alloys. Sources: STEINERT, XSS T EVO 5.0; STEINERT, Aluminum recycling; Pellenc ST, XPERT, undated.

DOE laboratory authors (at PNNL and Argonne, two US national laboratories) report that XRT cannot identify individual alloys. It separates cast from wrought faster than XRF or LIBS, at up to 30 t/h, but its wrought product can still carry about 15% cast by weight. Source: PNNL and Argonne, 2025, citing Kelly and Apelian, 2017.

X-ray fluorescence (XRF)

XRF reads the characteristic X-rays that each element emits, so it reads composition. A 2021 review notes that it is mainly used to sort ferrous and non-ferrous metals, rocks and glass. Source: Araujo-Andrade et al., 2021.

On aluminum it has a blind spot. Kelly and Apelian's 2016 study for the Aluminum Association notes that XRF identifies the heavier alloying elements but not aluminum, silicon or magnesium. DOE laboratory authors group XRF with LIBS as composition readers that can split cast from wrought and sort by alloy, at about 3 to 8 t/h. Sources: Kelly and Apelian, 2016; PNNL and Argonne, 2025.

Its main use on a metals line is the heavy fraction. STEINERT's XRF sorters split copper, zinc, brass and stainless steel, down to 5 mm. Its belt model takes 10 to 120 mm on belts 1,000 or 2,000 mm wide and adds a 3D laser; its chute model, 1,000 or 1,400 mm wide, needs a narrow size band. REDWAVE offers XRF on a belt for about 4 to 25 mm and in free fall for about 15 to 180 mm, and lists Zorba, Zurik and incinerator bottom ash among its uses. Sources: STEINERT, Non-ferrous metal recycling; STEINERT, KSS XF L; STEINERT, CHUTEC; REDWAVE, XRF; all undated.

The surface matters. DOE laboratory authors warn that X-rays penetrate metal only shallowly, so paint, dust or oil can cause a wrong reading or none. STEINERT says its belt model tells copper from brass or zinc even on heavily soiled pieces, such as those from incineration. Sources: PNNL and Argonne, 2025; STEINERT, KSS XF L.

In a 2024 peer-reviewed study, an industrial XRF sorter run on the 10 to 32 mm metal fraction of mixed foundry residues produced a copper concentrate of up to 98.3% copper. Source: Kölking et al., 2024.

Laser-induced breakdown spectroscopy (LIBS)

A LIBS sensor fires a pulsed laser at the surface, makes a plasma there and measures the elements in it. It measures one point at a time, so it has to scan. In double-pulse LIBS, the first pulse cleans a spot and the second analyses it. Source: Araujo-Andrade et al., 2021.

Sorting wrought aluminum by alloy family is mainly LIBS work today. STEINERT's PLASMAX reads pieces in flight after the belt, using 3D data and laser analysis at several spots. It sorts alloy classes 6xxx, 5xxx, 4xxx and 3xxx into three discharges at once, at a purity STEINERT puts above 95%. Binder+Co's CLARITY metal sorter pairs LIBS with cameras, AI recognition, induction and 3D scanning, for alloy-pure aluminum such as AL6060. TOMRA's AUTOSORT PULSE also uses LIBS; its throughput is in section 4. Sources: STEINERT, PLASMAX, undated; Binder+Co, CLARITY metal sorting; TOMRA, AUTOSORT PULSE.

In research trials reviewed for the Aluminum Association in 2016, LIBS identified wrought alloys in production scrap correctly more than 95% of the time. In 2025, though, the DOE team concluded that no current sensor method sorts shredded aluminum by individual alloy at commercially viable rates. Makers publish higher throughput figures; section 4 sets them out with their dates. Sources: Kelly and Apelian, 2016; PNNL and Argonne, 2025.

Colour cameras and AI vision

A camera reads colour, shape and texture. DOE laboratory authors describe colour sorters as fast, up to 35 t/h, but limited to pieces that look different. They work for copper, which is reddish, against brass, which is yellow. Most shredded aluminum looks alike whether cast or wrought, so colour alone does not split them; shape-based camera trials reached above 85% purity on batches of a few hundred pieces. Source: PNNL and Argonne, 2025.

Makers combine cameras with other sensors. STEINERT's KSS carries up to four sensors, among them colour, induction and 3D, and its US aluminum page shows a 10 to 40 mm Zorba fraction going from its eddy current separator to a KSS. Sesotec's VARISORT takes up to three: colour and shape, metal, and NIR. Sesotec says it separates zinc and copper optically, and stainless steel and iron electromagnetically. Sources: STEINERT, Non-ferrous metal recycling; STEINERT, Aluminum recycling; Sesotec, VARISORT brochure; Sesotec, Metal recycling, undated.

On MRF can lines, the separator's product still carries other metal, fiber and plastic. Some MRFs clean it at a staffed quality-control station; others sell it as it comes off, depending on the stream and on what a cleaner bale earns. Cameras can do part of that job. AMP says its Vision cameras identify material at belt speeds up to 600 fpm, and its MicroJet uses them to fire side-mounted air nozzles for in-stream quality control on lower-volume lines. Aluminum recovery on MRF container lines covers that station. Sources: GBB for CMI, 2020; AMP, Vision and MicroJet.

Near-infrared (NIR)

NIR, at 900 to 2,500 nm, identifies the chemical groups typical of polymers. It reads a shallow layer, under about 4 mm, and conventional NIR does not work on black plastics. At MRFs, NIR sorters identify mainly plastics and fiber. Sources: Araujo-Andrade et al., 2021; STEINERT, Auto shredder residue (conventional NIR); GBB for CMI, 2020.

Metal can even disturb it. CEFLEX tests on flexible packaging found that opaque or reflective layers, aluminum and metallisation among them, can change NIR sorting results above certain thresholds; its page does not give the thresholds. Source: CEFLEX, 2023. On MRF lines, an optical sorter may read a PET-sleeved can as PET, though no one has measured how often (MRF container lines, section 4).

NIR still has a place in a metals plant, on the plastics. STEINERT's shredder residue chain includes NIR sorting of the residue's plastics, and Sesotec's VARISORT can carry an NIR sensor beside its metal sensor. Sources: STEINERT, Auto shredder residue, undated; Sesotec, VARISORT brochure.

3Where each sorter sits after the eddy current separator

Published aluminum lines put the sensors after the separator. STEINERT states the sequence plainly: magnets take out iron, the eddy current separator recovers the non-ferrous metal and drops plastic, wood and glass, and sensor sorters then refine the product. In auto shredder plants, most of the aluminum leaves the non-ferrous stream at the eddy current separator as Zorba, which Kelly and Apelian put at typically about 65% aluminum alloy by weight. Sources: STEINERT, Aluminum recycling, undated; Kelly and Apelian, 2016.

The published sequences behind this table start with magnets. This guide follows the separator makers' manuals: magnets go ahead of the separator, and the separator is not relied on to remove steel. Removing ferrous metal before the separator covers the magnets.

In the ash row, Šyc et al. describe one Copenhagen plant that screens its ash into seven fractions, runs an eddy current separator on each of six, and adds induction sorters for stainless steel on the two coarsest. Source: Šyc et al., 2020, citing Kallesøe and Dyhr-Jensen, 2018.

Splitting cast from wrought

Cast and wrought aluminum differ in chemistry. DOE laboratory authors give a typical cast alloy, 356, about 7% silicon, against at most 1.1% in the sheet alloy 6111. Can bodies are 3xxx alloys and their ends 5xxx. Source: PNNL and Argonne, 2025. Many impurities build up in recycled aluminum and are hard to remove in the melt; Gaustad and colleagues note that dilution with primary metal, the usual fix, caps recycled content. Source: Gaustad, Olivetti and Kirchain, 2012.

No single sensor does the whole split. XRT removes the dense, high-alloy cast at high tonnage but leaves about 15% cast in the wrought, by the DOE authors' figure. TOMRA's published sequence follows XRT with an RGB-camera unit that removes low-alloy cast by shape, then a LIBS sorter that identifies specific alloys. Sources: PNNL and Argonne, 2025; TOMRA, 2025 and 2026.

Other methods are still at the research stage:

• Fusing LIBS with colour and depth images in deep-learning models separated cast from wrought at about 99% precision and recall. Source: Díaz-Romero et al., 2023.
• Magnetic induction spectroscopy classified wrought from cast in the lab at 89.66% recovery and 94.96% purity. A first industrial trial fell short, because of partial sensor coverage, which face of the piece met the sensor, and the choice of model. Source: Williams et al., 2023.
• The DOE team colour-coded alloy families chemically and sorted them on an optical sorter built for food products and plastics, at about 93 to 97% purity. Source: PNNL and Argonne, 2025.

ReMA, the Recycled Materials Association, now has a grade for each side of the split (section 6).

4Throughput figures and their dates

Sensor sorters are rated per machine, in tons an hour, and the figures vary by sensor and by who states them. Each row gives the figure with its date. Makers' figures are their own claims. The DOE figures come from a 2025 peer-reviewed paper by authors at two US national laboratories, PNNL and Argonne, which surveys sorting methods before reporting its own trials.

Read the figures in that light. The DOE paper concluded that no current sensor method sorts shredded aluminum by individual alloy at commercially viable rates, while the makers' highest LIBS figures, 11 and 15 t/h, sit above the DOE range. Neither is a measurement on your stream. Source: PNNL and Argonne, 2025.

A sorter sees only the size band screened for it. Size an XRF or LIBS sorter on that band's tonnage, not the line total: the RFQ checklist for a non-ferrous recovery line asks for it (item 3.5).

5What each sorter needs from the feed

A sensor can only judge a piece it sees clearly. The makers and researchers read for this page ask for pieces in a screened size band, spread out across the belt. Surface sensors also need a face clean enough to read.

A screened size band

Spaleck, a screen maker, says LIBS, NIR, XRF and XRT sorters all work better on size-graded feed. It suggests fractions such as 10 to 30 or 20 to 60 mm, about a 1:3 ratio between the smallest and largest piece, and removing long pieces. Source: Spaleck, 2026.

STEINERT's US aluminum page screens Zorba to 10 to 40, 25 to 60 and 60 to 120 mm, and profiles to 30 to 80 mm, before its sensors. Its XRF chute sorter needs a narrow size band. Sources: STEINERT, Aluminum recycling (US application page); STEINERT, CHUTEC. Screening ahead of separation covers the screens.

Pieces spread out

Šyc et al. say induction sorting needs the material spread in a thin layer. Sesotec's brochure has material arrive "optimally scattered on a fast-running conveyor belt", with a vibratory feeder offered as an option. STEINERT feeds its LIBS sorter with a multi-stage feeder that covers the belt, and Spaleck asks for an even spread across the sorter's width. Sources: Šyc et al., 2020; Sesotec, VARISORT brochure; STEINERT, PLASMAX; Spaleck, 2026.

Belt speed ahead of the sensor: [feed belt speed ahead of induction sorters: the makers publish widths and size ranges but not belt speeds; each maker's installation requirements would fill it]

A clean face for the surface sensors

XRF and LIBS read the surface, so paint, dust and oil are the risk (section 2). Double-pulse LIBS cleans a spot before it reads it, and STEINERT offers an optional zig-zag classifier that removes dust ahead of its XRF chute sorter. XRT reads through the piece, which STEINERT says makes it insensitive to surface dirt. Sources: Araujo-Andrade et al., 2021; STEINERT, CHUTEC; STEINERT, XSS T EVO 5.0.

On the belt or in free fall

Some sorters read the pieces after they leave the belt. STEINERT's PLASMAX reads them in flight, REDWAVE offers XRF on a free-fall chute, STEINERT's CHUTEC is a chute sorter, and MSS builds its induction sorter in a slide version. For these, the feed conveyor's job is a steady, spread layer at the drop. Sources: STEINERT, PLASMAX; REDWAVE, XRF; STEINERT, CHUTEC; MSS, MetalMiner.

Belt splices over a metal sensor

Remcon Equipment, the publisher's affiliate, notes on its quick-change belt project page that mechanical lacing puts metal in a belt, and that it uses an endless splice where a belt runs past a metal detector. Source: Remcon Equipment, Quick-change belt.

Compressed air

Air-jet sorters run on compressed air. Šyc et al. note that sensor sorting's demand for computing and compressed air is one reason it is mostly used on higher-value streams, such as electronics. Source: Šyc et al., 2020. The RFQ checklist asks for air volume and pressure (item 6.4).

What the publisher's affiliate builds

Remcon Equipment, the publisher's affiliate, does not build sensor sorters. It builds the conveyors, hoods, structure, feed equipment and compressed-air supply around sorters made by others, as its sorter support project page describes. Its feed-presentation guide covers how belt speed, the step between belts and a wind tunnel affect sorter feed. This page links to it rather than repeating it. Sources: Remcon Equipment, Optical sorting support; Remcon Equipment, feed-presentation guide.

[First-hand example: what the affiliate's sorter-feed jobs at metal recyclers carried, whether an eddy current separator ran ahead of the sorter, and the belt speeds. To come from the affiliate's shop, once its publication is approved]

6Grades made by sensor sorting

ReMA's specifications name some grades partly by how the metal was made. One grade is defined by sensor sorting. Source: ReMA, ReMA's ISRI Specifications, July 2026.

Zurik is shredded non-ferrous scrap, mostly stainless steel, produced by computer sensing equipment such as induction sensor sorting or X-ray. It must have passed magnets, and it is sold under a number giving its percentage of non-ferrous metal. Source: ReMA, July 2026, p. 17.

Zorba may come from eddy current, air separation, flotation, screening or a combination, after one or more magnets. Twitch is defined by media separation, wet or dry: floated fragmentizer aluminum with no more than 1% free zinc, 1% free magnesium and 1% analytical iron, and no more than 2% non-metallics. Source: ReMA, July 2026, pp. 11 and 17.

So this guide calls an XRT product made from Zorba "a product comparable to Twitch", unless the buyer's contract names it. Some makers call it Twitch: TOMRA's 2020 release does. Source: TOMRA, 2020 release, as reprinted by WENDT.

Two newer grades describe the two sides of a cast-from-wrought split. Vesper, approved on July 15, 2025, is wrought aluminum (sheet, extrusion or plate) separated from Zorba or Twitch, with no more than 1% free magnesium, 1% free zinc, 0.5% analytical iron and 1% non-metallics. Ginger, approved on April 13, 2026, is mixed shredded cast aluminum mechanically separated from Zorba and Twitch, with no more than 1% each of free magnesium, zinc and iron, and 1% non-metallics. Sources: ReMA, July 2026, pp. 2, 7 and 11; ReMA, Vesper article, 2025 (Vesper approval date).

Aluminum scrap grades and what buyers accept covers every grade and what the mills reject.

7What to tell the sorter maker

Give each sorter maker the same facts, in the same order:

• the target, what must come out, and the property that separates them: conductivity, density, elements, or colour and shape
• the size band after screening, with the largest and smallest piece
• the surface: painted, oily or dusty pieces, which matter most for XRF and LIBS
• the tonnage in each size band, not the line total
• whether the sorter reads on the belt or in free fall, and the belt width and speed it expects from the feed conveyor
• compressed air volume and pressure, and power
• for an X-ray sorter, its shielding and safety documents: [US registration and shielding rules for X-ray sorters, by state: not researched; each state's radiation control program would fill it]
• the purity your metal buyer applies: a ReMA grade or contract terms

Sources: PNNL and Argonne, 2025 (surface, tonnage); STEINERT, PLASMAX and REDWAVE, XRF (belt or free fall); Šyc et al., 2020 (compressed air); ReMA, July 2026 (grades).

The full RFQ checklist for a non-ferrous recovery line adds the questions for the separator and the magnets. Sensor-sorter makers are listed in the directory.

8Questions

9Sources

Every source below was read on 2026-10-06. Manufacturers' figures are their own claims about their own machines; nothing here was tested by the publisher.

1. Goudsmit Magnetics, What determines the separation efficiency of eddy current systems, knowledge base, undated (manufacturer). https://www.goudsmitmagnetics.com/en-us/knowledge-base-efficiency-of-eddy-current-separators. Read 2026-10-06.
2. STEINERT, ISS induction sorting system, product page, undated (manufacturer). https://steinertglobal.com/us/sorting-systems/sensor-sorting/induction-sorting-system/. Read 2026-10-06.
3. Sesotec, VARISORT brochure, version 1.2, code 0817 (manufacturer). https://www.sesotec.com/sites/593fc2aac25e5b0640a20ff8/content_entry59e75c78ffe9ecdb05f0bdf9/5a97c50bffe9ec732a731491/files/varisort-pr-en.pdf. Read 2026-10-06.
4. Kelly S., Apelian D. (Worcester Polytechnic Institute) for the Aluminum Association, Automotive Aluminum Recycling at End of Life: A Grave-to-Gate Analysis, 2016, Appendix A (industry association; commissioned academic study). https://www.aluminum.org/sites/default/files/2021-10/Final-Report-Automotive-Aluminum-Recycling-at-End-of-Life-A-Grave-to-Gate-Analysis.pdf. Read 2026-10-06.
5. STEINERT, Aluminum recycling (US application page), undated (manufacturer). https://steinertglobal.com/us/applications/metal-recycling/aluminum-recycling/. Read 2026-10-06.
6. Efe et al. (Pacific Northwest National Laboratory and Argonne National Laboratory, for the US DOE Vehicle Technologies Office), Alloy selective optical sorting of mixed post-consumer aluminum scrap streams, Resources, Conservation and Recycling 223, July 10, 2025 (government; peer-reviewed; accepted manuscript), doi 10.1016/j.resconrec.2025.108500. https://www.osti.gov/pages/biblio/3021470. Read 2026-10-06.
7. Gershman, Brickner & Bratton (GBB) for the Can Manufacturers Institute, Aluminum Beverage Can: Driver of the U.S. Recycling System, June 23, 2020 (commissioned report). https://www.cancentral.com/wp-content/uploads/2023/03/GBB-Report-Aluminum-Can-Drives-U.S.-Recycling-System-Final-2020-0623.pdf. Read 2026-10-06.
8. Araujo-Andrade C. et al., Review on the photonic techniques suitable for automatic monitoring of the composition of multi-materials wastes..., Waste Management and Research, March 21, 2021 (peer-reviewed review). https://www.ebi.ac.uk/europepmc/webservices/rest/PMC8165644/fullTextXML. Read 2026-10-06.
9. STEINERT, XSS T EVO 5.0 X-ray sorting system, product page, undated (manufacturer). https://steinertglobal.com/us/sorting-systems/sensor-sorting/x-ray-sorting-systems/steinert-xss-t-evo-50/. Read 2026-10-06.
10. MSS, MetalMiner, product page, undated (manufacturer). https://www.mssoptical.com/technology/metalminer/. Read 2026-10-06.
11. STEINERT, PLASMAX LIBS sorting system, product page, undated (manufacturer). https://steinertglobal.com/sorting-systems/sensor-sorting/libs-sorting-systems/steinert-plasmax-libs/. Read 2026-10-06.
12. CEFLEX, NIR test programme reveals factors influencing sorting flexible packaging materials, December 15, 2023 (industry association). https://ceflex.eu/nir-test-programme-reveals-factors-influencing-sorting-flexible-packaging-materials/. Read 2026-10-06.
13. Šyc M., Simon F.G., Hykš J., Braga R., Biganzoli L., Costa G. et al., Metal recovery from incineration bottom ash: state-of-the-art and recent developments, Journal of Hazardous Materials 393:122433, 2020 (peer-reviewed). https://doi.org/10.1016/j.jhazmat.2020.122433; open-access copy https://d-nb.info/1206412569/34. Read 2026-10-06.
14. Binder+Co, CLARITY metal sorting, product page, undated (manufacturer). https://www.binder-co.com/en/products/clarity-sorting-machines/metal-sorting/. Read 2026-10-06.
15. TOMRA Sorting Recycling, news release on producing low-magnesium Twitch from Zorba, April 28, 2020, as reprinted by WENDT Corporation (manufacturer's own claims). https://www.wendtcorp.com/americas/2020/04/28/wendt-exclusive-partner-tomra-sorting-recycling-enables-the-production-of-low-magnesium-twitch-from-zorba/. Read 2026-10-06.
16. Pellenc ST, XPERT, product page, and Products, range page, undated (manufacturer). https://www.pellencst.com/products/xpert/; https://www.pellencst.com/products/. Read 2026-10-06.
17. STEINERT, Non-ferrous metal recycling, application page, undated (manufacturer). https://steinertglobal.com/applications/metal-recycling/non-ferrous-metal-recycling/. Read 2026-10-06.
18. STEINERT, KSS XF L, product page, undated (manufacturer). https://steinertglobal.com/us/sorting-systems/sensor-sorting/x-ray-sorting-systems/steinert-kss-xf-l/. Read 2026-10-06.
19. STEINERT, CHUTEC, product page, undated (manufacturer). https://steinertglobal.com/us/sorting-systems/sensor-sorting/x-ray-sorting-systems/steinert-chutecr/. Read 2026-10-06.
20. REDWAVE, REDWAVE XRF and REDWAVE XRF/C for Zorba, product pages, undated (manufacturer). https://redwave.com/en/products/redwave-xrf; https://redwave.com/en/products/redwave-xrf/zorba. Read 2026-10-06.
21. Kölking et al., More resource efficient recycling of copper and copper alloys by using X-ray fluorescence sorting systems, Waste Management and Research, 2024 (peer-reviewed; abstract read). https://doi.org/10.1177/0734242x241241601; abstract at https://pmc.ncbi.nlm.nih.gov/articles/PMC11370146/. Read 2026-10-06.
22. TOMRA, news release on the launch of AUTOSORT PULSE with dynamic LIBS, June 1, 2023, and AUTOSORT PULSE, product page, undated (manufacturer). https://www.tomra.com/waste-metal-recycling/media-center/news/2023/tomra-launches-autosort-pulse-with-dynamic-libs-technology; https://www.tomra.com/waste-metal-recycling/products/machines/autosort-pulse. Read 2026-10-06.
23. Sesotec, Metal recycling, application page, undated (manufacturer). https://www.sesotec.com/en/applications/recycling/metal. Read 2026-10-06.
24. AMP, Vision and MicroJet, technology pages, 2026 (manufacturer). http://ampsortation.com/technologies/vision; http://ampsortation.com/technologies/microjet. Read 2026-10-06.
25. STEINERT, Auto shredder residue, application page, undated (manufacturer). https://steinertglobal.com/us/applications/metal-recycling/auto-shredder-residue/. Read 2026-10-06.
26. TOMRA, news article on a deep-learning sorter to upgrade wrought aluminum scrap, March 31, 2025, and article on high-purity aluminum through AI sorting, June 3, 2026 (manufacturer). https://www.tomra.com/waste-metal-recycling/media-center/news/2025/tomra-pioneers-a-new-deep-learning-based-solution-to-upgrade-wrought-aluminum-scrap; https://www.tomra.com/waste-metal-recycling/media-center/news/2026/achieving-high-purity-aluminium-circularity-through-precision-ai-sorting. Read 2026-10-06.
27. Gaustad G., Olivetti E., Kirchain R., Improving aluminum recycling: a survey of sorting and impurity removal technologies, Resources, Conservation and Recycling 58:79-87, 2012 (peer-reviewed; abstract read). https://ideas.repec.org/a/eee/recore/v58y2012icp79-87.html. Read 2026-10-06.
28. Díaz-Romero D. et al., Classification of aluminum scrap by LIBS and RGB+D image fusion using deep learning approaches, Resources, Conservation and Recycling 190, 2023 (peer-reviewed; preprint abstract read), doi 10.1016/j.resconrec.2023.106865. https://doi.org/10.2139/ssrn.4272447. Read 2026-10-06.
29. Williams et al., Classification of shredded aluminium scrap metal using magnetic induction spectroscopy, Sensors 23(18):7837, September 12, 2023 (peer-reviewed; abstract read). https://doi.org/10.3390/s23187837. Read 2026-10-06.
30. Spaleck, LIBS, XRT, NIR and more: why modern sorters love good screening machines, June 2, 2026, updated July 17, 2026 (manufacturer). https://www.spaleck.eu/libs-xrt-nir-and-more-why-modern-sorters-love-good-screening-machines/. Read 2026-10-06.
31. Remcon Equipment, Inc. (the publisher's affiliate), Quick-change belt, project page, undated (affiliate's own site). https://www.remconequipment.com/project-quick-change-belt. Read 2026-10-06.
32. Remcon Equipment, Inc. (the publisher's affiliate), Optical sorting system support, project page, undated (affiliate's own site). https://www.remconequipment.com/project-optical-sorting-support. Read 2026-10-06.
33. Remcon Equipment, Inc. (the publisher's affiliate), Why your optical sorter underperforms: feed presentation, guide, undated (affiliate's own site). https://www.remconequipment.com/guide-mrf-feed-presentation. Read 2026-10-06.
34. Recycled Materials Association (ReMA), ReMA's ISRI Specifications, July 2026 (standard; industry association). https://www.isrispecs.org/wp-content/uploads/2026/09/2026-July-ReMA_ISRI_Specifications.pdf. Read 2026-10-06.
35. Recycled Materials Association (ReMA), ReMA's Vesper specification highlights collaborative achievement in recycled materials industry, news article, August 28, 2025 (industry association). https://www.recycledmaterials.org/remas-vesper-specification-highlights-collaborative-achievement-in-recycled-materials-industry/. Read 2026-10-06.