Bare Printed Circuit Board Recycling



A bare printed circuit board (bare PCB) is a basic component in an electronic product that provides a platform for connecting and supporting electronic components. Simply put, a bare PCB is a printed circuit board that does not yet have any electronic components mounted on it, and contains only the base structure of the substrate, conductive traces, and pads.

The substrate of a bare PCB is usually made of an insulating material, such as FR-4 glass fiber reinforced epoxy resin, which has good electrical properties and mechanical strength. Conductive lines are formed on the substrate through etching or printing processes, and they form the main part of the circuit for transmitting electrical energy and signals. Solder pads, on the other hand, are metal areas used to connect the electronic components, which are fixed to the PCB by soldering and other means.

Recycling Process

The bare PCB without electronic components is fed into the shredding and crushing integrated machine to crush the circuit board to 3-5 centimeters in size. The crushed particles then enter the crusher to be further crushed to 1-2 centimeters in size.
Subsequently, these particles are fed into the three-stage mill through the feeding screw for grinding to obtain finer circuit board powder.
The mill comes with a grading and screening machine, during the grinding process, the circuit board powder that reaches the required mesh size goes to the next stage, while those that do not meet the requirements are recycled again for grinding.
The circuit board powder that reaches the required mesh number is sent to the wind specific gravity separator, according to the specific gravity of copper powder and resin fiber powder for primary separation, usually about 70% of the metal powder can be separated.
The powder separated from the specific gravity separator and the powder extracted from the upper air pumping into the pulse dust collector, the powder unloaded from the pulse dust collector contains a small amount of copper powder. These powders are then fed by the wind loader into the high voltage electrostatic separation equipment for further separation to obtain purer metallic and non-metallic components.

Recycling Advantages

Bare PCBs contain large amounts of metals and other recyclable materials such as copper, gold, silver, and aluminum, as well as plastic composites such as fiberglass. Recycling these materials can significantly reduce the need for new resource extraction and save natural resources.
Recycling bare PCBs can reduce environmental pollution from e-waste. Heavy metals and toxic chemicals contained in e-waste can cause serious harm to soil, water and the ecological environment if they are discarded without treatment. Through recycling, it can ensure that these harmful substances are properly disposed of and reduce environmental pollution.

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PCB recycling