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Printed circuit board recycling: Physical processing and copper extraction by selective leaching.

Flávia P C Silvas1, Mónica M Jiménez Correa1, Marcos P K Caldas2

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This study presents a new hydrometallurgical process for recycling printed circuit boards (PCBs) to recover copper. The developed method achieves 100% copper extraction, offering a sustainable solution for electronic waste management.

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CopperLeachingRecyclingWEEE

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemical Engineering

Background:

  • Global waste electrical and electronic equipment (WEEE) generation exceeds 40 million tons annually.
  • Increasing WEEE volumes and stringent regulations drive demand for effective recycling processes.
  • Printed circuit boards (PCBs) are a significant component of WEEE, rich in valuable metals like copper.

Purpose of the Study:

  • To develop and evaluate a novel hydrometallurgical route for copper recovery from printer PCBs.
  • To optimize a two-stage leaching process for efficient metal extraction.
  • To assess the overall efficiency and sustainability of the proposed recycling method.

Main Methods:

  • Characterization of PCBs, including physical and chemical composition analysis.
  • Implementation of a combined physical (magnetic separation) and hydrometallurgical (acid digestion) process.
  • Two-stage leaching: initial sulfuric acid stage followed by an oxidant media stage.
  • Chemical analysis using Inductively Coupled Plasma - Optical Emission Spectrometry (ICP-OES).

Main Results:

  • PCBs comprised 44.0% metallic, 28.5% polymeric, and 27.5% ceramic fractions, with copper as the primary metal (32.5 wt.%).
  • Sulfuric leaching extracted 90% Al, 40% Zn, and 8.6% Sn.
  • Oxidant leaching achieved 100% Cu, 60% Zn, and 10% Al extraction.

Conclusions:

  • The developed hydrometallurgical process successfully achieves 100% copper extraction from PCBs with a 98.46% recovery factor.
  • This method provides an efficient and sustainable route for recovering valuable copper from electronic waste.
  • The findings contribute to the circular economy by promoting resource recovery in the electrical and electronic industry.