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Metal Recycling

How metal recycling works end-to-end and why it pays the prices it does.

Metal recycling: how scrap becomes new metal

This category covers the core recycling streams — steel, aluminum, copper, brass — from the moment a piece leaves its original use to the moment it ships out of a mill as new product. Steel alone is the most-recycled material on earth by tonnage, and aluminum recycling saves around 95% of the energy of primary production. The pages here trace why those numbers work, who handles each step, and where the economics break.

What this category covers

The recycling chain has five steps. Each one has its own operators, equipment, and economics. Sub-topics:

  • Collection — yards, drop-off, curbside, contractor pickups
  • Sorting — visual + magnet + density + XRF, depending on the operator
  • Processing — shred, shear, baler, granulator (sized to the mill's furnace charge)
  • Melting and refining — EAF for steel, secondary smelter for non-ferrous
  • Casting and rolling — ingot, billet, coil, ready for fabricators

The recycling chain by metal

Different metals route through different downstream paths. A simplified map:

MetalPrimary furnaceTypical recovered yieldEnergy savings vs. primary
Steel (carbon)Electric arc furnace95%+60–75%
AluminumReverberatory / induction90–95%around 95%
CopperAnode furnace + electrolytic refine95%+85–90%
BrassDirect remelt95%+80–90%
StainlessEAF (alloy mill)90%+50–70%

For a leaf-level walk through every stage, see Metal Recycling, End to End.

Why mass-recovery rate matters

A material is genuinely recyclable when most of its mass survives the recycling process and ends up in the next product. Metal recycling clears that bar; most plastics don't.

  • Mass loss in steel recycling is mostly oxidation in the furnace and slag-bound contaminants — kept under 5% in modern EAFs
  • Aluminum recycling loses some metal to dross (oxidized aluminum on the melt surface) but stays above 90%
  • Copper recovers nearly perfectly because it's electrochemically refined back to above 99.9% pure
  • Painted, oily, or coated material costs the mill in pre-treatment — that cost flows back to the seller as a grade downgrade

What gets rejected and why

  • Sealed refrigerant systems — must be evacuated; mill receiving it intact is a regulatory issue
  • Lithium batteries — fire risk in shredders, fully separate stream
  • Mercury-bearing switches and thermostats — toxic, regulated handoff
  • Heavily-painted scrap — older lead paint flagged in many states
  • PCB-contaminated transformers — pre-1979 oil-filled units have to be tested

For a clean-load checklist by grade, start with Metal to Be Recycled: A Sorting Guide.

Frequently asked questions

Why does metal recycling work when plastic doesn't?

Mass-recovery rate. Metal recycling routinely returns 90%+ of input mass as usable output; mechanical plastic recycling often returns far less, and the polymer chains degrade with each cycle. Metal doesn't degrade — every atom of recycled steel is identical to virgin steel.

How much energy does aluminum recycling actually save?

Roughly 95% vs. primary aluminum production from bauxite. Secondary aluminum is one of the few industrial streams where the energy and carbon math is uncontroversially good. Live aluminum pricing reflects this — energy spikes hit primary harder than secondary, see Aluminum Price.

Where does my scrap physically go?

Yard, then regional processor, then mill. Existing leaves like Recycle Scrap Steel and Scrap Metal Recycling trace the chain in detail.

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