What Is in a PCB?

A typical printed circuit board contains electronic components (58%), substrate material (37%), and solder (5%). The substrate itself is about 40% metal and 60% non-metal, containing elements across the periodic table. One ton of computer circuit boards yields approximately 0.5 kg gold, 130 kg copper, 10 kg iron, 60 kg lead, 40 kg tin, 36 kg nickel, 40 kg antimony, plus platinum, palladium, and other rare metals. This concentration makes PCB recycling one of the highest-value segments in e-waste processing.

Why Recycle PCBs?

PCB recycling serves two purposes. Environmentally, it prevents heavy metals — lead, cadmium, mercury — from leaching into soil and groundwater. It also reduces the solid waste burden on landfills. Economically, it recovers valuable metals including copper, gold, silver, aluminum, and palladium at concentrations far higher than natural ore deposits. Reusing these metals cuts demand for virgin mining and lowers production costs for manufacturers.

System Features and Performance

Wanrooe PCB recycling lines use PLC-controlled automation for stable, continuous operation with minimal labor. The integrated compact design saves floor space and simplifies installation. On-site commissioning and operator training ensure smooth startup.

The process flow is straightforward: shred or crush the PCB, screen to uniform size, then separate metals from non-metals using air classification and electrostatic separation. Combined recovery rates reach 99.9% for copper and other conductive metals.

The PCB Recycling Process

Step 1 — Preprocessing — Remove electronic components from the PCB substrate. Components may contain reusable chips or require separate hazardous handling. The bare board then feeds into the recycling line.

Step 2 — Crushing and separation — The substrate is shredded and ground to liberate metal from resin fiber. A rotary vibrating screen sizes the material. Air separation removes light fiber dust. Electrostatic separation splits conductive metals from non-conductive resin. The result is clean metal concentrate and resin fiber for disposal or further use.

Key components of the line: Primary shredder, secondary crusher, grinding mill, rotary screen, air classifier, electrostatic separator, dust collection system, and PLC control cabinet.

FAQ: PCB Recycling

Can I recycle PCBs with components still attached?

Components should be removed first. Some contain reusable semiconductors; others hold hazardous materials like mercury switches or leaded capacitors that need special handling. Bare boards process more efficiently and produce cleaner metal output.

What is the resin fiber used for after separation?

Resin fiber from PCB substrates has limited reuse value due to brominated flame retardant content. It is typically sent to hazardous waste incineration or secure landfill. Some specialized facilities extract the bromine for chemical reuse.

How do I handle the dust from PCB shredding?

PCB dust contains heavy metals and fine glass fiber that are hazardous to inhale. A properly designed dust collection system with HEPA filtration and negative pressure containment is mandatory. Workers also require respiratory protection during maintenance access.