What happens to a circuit board after you recycle it

Grading comes first

Boards are sorted by how much precious metal they carry. The categories vary between processors, but the shape is consistent.

• High grade. Telecom boards, server boards, some industrial control boards. Gold-plated edge connectors, gold pins, dense population.
• Mid grade. PC motherboards, expansion cards, laptop boards.
• Low grade. Power supply boards, television boards, appliance boards. Mostly copper and steel, very little gold.

The spread between high and low grade is large. Mixing them into one gaylord means the whole box gets priced as the lowest thing in it, which is the same trap as mixing copper grades.

Component removal

Some parts are worth more off the board than in the shredder. Processors, memory, and certain capacitors get removed first, either by hand or on a heated depopulation line that softens the solder.

CPUs in particular carry enough gold to be graded and sold on their own. Anyone who has watched a depopulation bench has seen someone pulling processors into a separate tray.

Batteries come off here too, if they were not caught at intake. A coin cell soldered to a motherboard is easy to miss and unwelcome in a shredder.

Shredding and separation

What is left gets shredded, then granulated into a coarse powder. That mixture goes through mechanical separation: magnets pull ferrous metal, eddy current separators throw non-ferrous metal, and density tables split the remaining metal from the fibreglass and resin.

What comes out is a concentrate that is far richer in metal than the board was, and a plastic and glass fraction that has little value and has to go somewhere.

Refining

The concentrate goes to a smelter. Very few recyclers refine in house, because the plant needed is enormous and the permitting is difficult. Most collect, sort, process to concentrate, and ship to a refiner they have a relationship with.

At the smelter the copper is recovered as the primary metal, and gold, silver, palladium and platinum come out of the process alongside it. Settlement is on assay, meaning the refiner samples the lot and pays on measured content rather than on estimate.

This is the step that makes downstream vetting more than paperwork. A recycler is accountable for the facility it ships to, which is one of the things R2 and e-Stewards are built to check.

Why this matters to a seller

Three practical consequences.

Keep grades apart. A separate box for server and telecom boards costs nothing and protects their value.

Leave the boards alone. Pulling gold pins with pliers usually damages more value than it recovers, and there is no home process that beats a smelter.

Ask where the concentrate goes. A recycler who can name the refiner is telling you the chain is real.