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The general utilization of scrapped PC board.

Robert Liu¹, R S Shieh, Ruth Y L Yeh

¹Department of Chemical and Materials Engineering, Minghsin University of Science and Technology, Hsinchu, Taiwan.

Waste Management (New York, N.Y.)

|August 18, 2009

Summary

This study presents an eco-friendly method for recycling copper from electronic waste, transforming waste into valuable materials like copper oxide and plastic fillers. The process avoids pollution and enhances material utilization.

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Area of Science:

Materials Science
Environmental Engineering
Chemical Engineering

Background:

Traditional methods for recovering copper from printed circuit boards (PCBs) involve burning, which leads to significant environmental pollution.
There is a need for sustainable and efficient processes to recycle electronic waste and recover valuable materials.

Purpose of the Study:

To develop a novel, environmentally friendly process for recovering copper from scrapped PCBs.
To maximize the utilization of all materials present in waste PCBs.
To characterize the properties of recovered materials and their applications.

Main Methods:

Scrapped PCBs were crushed and dissolved in an ammonia/ammonium carbonate solution with aeration to recover copper.
Copper carbonate was distilled and heated to obtain pure copper oxide (CuO) nanoparticles.
The remaining solid residue was leached with hydrochloric acid to remove tin and lead.
The final residue was utilized as a filler in polyvinyl chloride (PVC) plastics.

Main Results:

Pure copper oxide with an elliptical shape and approximately 0.2 micrometer particle size was successfully obtained.
The remaining solid residue, after copper, tin, and lead removal, was effectively used as a filler in PVC plastics.
PVC plastics filled with this residue exhibited comparable tensile strength to unfilled plastics, along with enhanced elastic modulus and abrasion resistance, at a lower cost.

Conclusions:

The developed process offers an environmentally sound alternative to traditional PCB recycling methods.
This method enables the recovery of valuable copper oxide and the valorization of residual waste as a functional filler for plastics.
The findings demonstrate the potential for a circular economy approach in electronic waste management.