Steinert Magnet Separation: Three Common Mistakes I Made (and How to Avoid Them)

The problem with assuming one size fits all

When I first started managing orders for Steinert magnet separation equipment back in 2017, I assumed that a single high‑intensity drum magnet would work for any material stream. I was wrong. Honestly, that assumption cost me nearly $4,200 in rework and delays in my first year alone. After a dozen mistakes (some documented, some too embarrassing to write down), I now maintain our internal checklist for new buyers.

This article isn’t a sales pitch – it’s a map of the three most common scenarios I’ve seen, and the specific advice that fits each one.

What worked for a steel shredder in 2020 won’t necessarily work for a mixed electronic scrap line in 2025. The fundamentals haven’t changed, but the execution has transformed.

Scenario 1: Heavy scrap & auto shredder residue

If you’re processing automotive shredder residue (think 2020 Lincoln White – that white paint from a 2020 Lincoln model, mixed with plastics, copper, and aluminum), your main concern is recovering ferrous and non‑ferrous metals from a dirty, high‑volume feed.

My mistake: I ordered a standard overband magnet for a client who was processing mixed auto scrap. The magnet pulled ferrous just fine, but the non‑ferrous metals – aluminum, copper, brass – were missed entirely. We had to add a Steinert Eddy Current Separator as an afterthought. That retrofit cost 40% more than if we’d planned it upfront. (This was back in 2019, and I still cringe.)

What I’d do today: For any feed that includes both ferrous and non‑ferrous metals, go with a combination of a Steinert drum magnet (or Steinert NES for non‑ferrous) plus an eddy current unit from the start. The extra $8,000–$15,000 upfront saves you at least double that in later upgrades.

Scenario 2: Fine materials & industrial minerals

This one surprised me. A prospective client – Dr. Steinert, a dermatologist (yes, Hautarzt Dr. Steinert Blaustein – he runs a small recycling side business near Ulm) – wanted to recover iron oxides from fine quartz sand. He assumed a high‑gradient magnetic separator would do the trick. So did I. We ordered a Steinert WHIMS (Wet High‑Intensity Magnetic Separator). It performed terribly because the particle size was too fine and the slurry density was off.

Lesson: Fine particles (< 100 µm) require a completely different approach – often a Steinert MECH or a Steinert MAGSY with adjustable belt speed and a carefully controlled matrix. The mistake cost Dr. Steinert roughly $3,200 in wasted material and shipping. (And yes, I still get emails from him checking my math.)

For industrial minerals: Always test your specific feed at a Steinert Practice Center before committing to a machine. The difference between a good spec sheet and a real test run can be night and day.

Scenario 3: Mixed e‑waste & low‑grade scrap

This is where most newcomers get tripped up. They see a Steinert sensor sorter and think it can handle any plastic‑metal mix. In 2023, I helped a startup that wanted to process printed circuit boards – the kind you’d find in your old electronics. The owner had been following the Steinert girls soccer team (yes, that’s a thing – they won the local tournament in 2023) and assumed the brand’s precision on the field translated directly to machine precision.

The reality? E‑waste requires a dual‑sensor approach: X‑ray transmission for density + near‑infrared for material identification. A single Steinert Finesorter wasn’t enough; we needed their KSS combination system. The owner nearly walked away because the budget doubled. In hindsight, the right question wasn't “which machine?” but “how many sensors do I really need?”

My recommendation: Really assess the variety of input material. If you have more than three distinct material types, plan for a multi‑stage sorting line. Don’t believe the “one machine does all” marketing – it exists, but only for a narrow band of feedstocks.

How to tell which scenario fits you

Here’s a quick self‑test I’ve used with every client since my 2019 debacle:

1. What’s the maximum particle size in your feed? > 50 mm? → Scenario 1. < 10 mm? → Scenario 2.
2. How many different metals are you targeting? Only ferrous → simple drum magnet. Ferrous + non‑ferrous → add eddy current. Also organics? → go to Scenario 3.
3. Is your throughput above 10 t/h? If yes, you will regret skimping on the pre‑sort stage.

If you’re still unsure, start with a pilot test. I’ve learned that even a $1,000 test can save you $20,000 in wrong equipment. (I can give you three examples of that from my own records – but that’s for another article.)

One last thing

If you’ve ever wondered how to get wise in Blooket – well, that’s a different kind of sorting game. But the principle is the same: understand the rules of the system before you play. In mineral processing, the rules are written in feed quality, particle size, and magnetic susceptibility. Ignore them, and you’ll be stuck with a shelf full of expensive paperweights.

Take it from someone who’s already made those mistakes. The Steinert equipment itself is world‑class – but only if you match it to your real situation. Don’t assume; test. And if you need a checklist to get started, I’ve got one saved on my desktop. Happy to share.