How to automate extracting gold from pcb boards with conveyor systems

Why conveyor-fed automation makes sense

Electronic waste is the fastest-growing waste stream in the world. Around 62 million metric tons were generated in 2022, and that figure is expected to pass 80 million metric tons by 2030. Circuit boards are the richest part of that stream, which is why they are the first place to look when you want to recover gold and other metals at scale.

Manual processing has three problems that automation solves directly:

• It is slow. A worker with hand tools can only strip and sort a few boards an hour.
• It is dangerous. Solder dust, lead, and fiberglass particles put workers at risk without proper protection.
• It is wasteful. Hand sorting misses fine metal particles that end up in landfill.

A conveyor-fed line removes all three. Material moves continuously from one stage to the next, separation is done by machines rather than eyes, and the whole system runs with one or two supervisors instead of a crew.

How the automated process works

A typical automated PCB recycling line follows the same sequence whether it processes 300 kg or 2,000 kg per hour:

1. Dismantling and inspection. Batteries and hazardous components are removed before anything enters the line.
2. Conveyor feeding. A belt conveyor carries boards into the shredder at a steady, controlled rate. This is the stage that makes the rest of the line predictable - the conveyor is the heartbeat of the whole system.
3. Pre-shredding. A shredder breaks the boards down into pieces small enough for the crushers.
4. Crushing and grinding. Two-stage crushing reduces the material to a fine powder, usually below 2 mm, freeing the metal from the fiberglass and resin.
5. Separation. Magnetic separation pulls out iron, air classification lifts away light plastics, and electrostatic separation recovers the non-ferrous metals - the copper- and gold-rich fraction.
6. Concentration. The metal concentrate is collected and can be melted into ingots for sale or sent for further refining.

The key point is that every stage is linked. The conveyor meters the feed, the crushers run at a rate matched to the shredder, and the separators adjust to the particle size coming in. That integration is what makes the process automated rather than merely mechanized.

Equipment you will need

A complete line needs four groups of equipment:

• A shredder or pre-chopper to reduce whole boards.
• A two-stage crushing and grinding system.
• Separation equipment - magnetic, air, and electrostatic, or a wet separator.
• Dust collection and air pollution control.

San Lan Technologies builds complete circuit board recycling plants that combine all of these stages. The WCBD series uses dry separation with air classifiers and electrostatic separators, producing copper powder with 96-98% purity and no dust pollution. The WCB series uses wet separation with water metal separators, which suits boards that still carry components. Capacities run from 300-500 kg/hour up to 2,000 kg/hour, and larger lines can be designed on request.

For the front end of the line, San Lan's shredder and pre-chopper range includes single-shaft, twin-shaft, and four-shaft models sized from 200 kg/hour to 4-6 tons/hour, so you can match the shredder to the throughput of your separation line.

If you plan to sell metal in ingot form rather than as powder, a medium frequency induction furnace melts the recovered copper, gold, and silver into ingots on site, which usually commands a better price than raw concentrate.

Choosing the right system size

The right capacity depends on how much material you can actually source, not how much you would like to process. A plant handling 300-500 kg/hour is a reasonable starting point for a regional operation. A plant processing 2,000 kg/hour suits an industrial-scale facility with a steady supply of boards. Circuit board recycling equipment from San Lan is available in both dry and wet process versions, so the choice comes down to your feed material and your local environmental requirements.

Two practical points worth planning for:

• Dust control. Dry lines generate fine dust, so a pulse bag dust collector and cyclone separator are part of the line, not optional extras.
• Water handling. Wet lines recycle most of their process water, but you still need a settling or treatment step before discharge.

Safety and environmental considerations

Automation does more than raise recovery rates; it keeps people away from the hazards. Sealed crushing and separation stages, dust collection, and air filtration mean operators supervise the line from a control area rather than standing over the machines. Wet systems capture dust in water, which also reduces airborne exposure.

On the environmental side, a well-run line keeps lead, solder, and fiberglass out of landfill and returns copper, gold, and silver to the supply chain. That is the argument that matters when you deal with regulators, insurers, and customers who want to know their e-waste is handled responsibly.

Getting started

Automating gold extraction from PCB boards with conveyor systems is not a single machine purchase; it is a process design. Start with a clear picture of your feed - how many tons of boards per day, whether they carry components, and whether you want dry or wet separation. Then match the shredder, crushers, separators, and dust control to that throughput, and plan the conveyor layout so material flows in one direction without bottlenecks.

San Lan Technologies has supplied circuit board recycling plants to customers in more than 20 countries and can provide the complete line, from shredder to melting furnace, with installation and commissioning support. If you are evaluating a project, the practical next step is to define your daily input tonnage and let that number drive the equipment selection.