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Recycling 2018, 3(2), 21; https://doi.org/10.3390/recycling3020021

Improving the Energy Concentration in Waste Printed Circuit Boards Using Gravity Separation

1
NBK Institute of Mining Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
2
Ronin8 Technologies Limited, Richmond, BC V7A 4T9, Canada
*
Author to whom correspondence should be addressed.
Received: 5 April 2018 / Revised: 8 May 2018 / Accepted: 11 May 2018 / Published: 16 May 2018
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Abstract

Electronic waste is one the fastest growing waste streams in the world, and printed circuit boards (PCBs) are the most valuable fraction of this stream due to the presence of gold, silver, copper, and palladium. Printed circuit boards consist of approximately 30% metals and 70% non-metals. The non-metal fraction (NMF) is composed of 60–65% fiberglass and 35–40% organics, in the form of surface-mount plastics and epoxy resins in the printed circuit board laminates. The organics in the NMF provide a potential alternative source of energy, but hazardous flame retardants contained in epoxy resins and the presence of residual metals create challenges for utilizing this material for energy recovery. This research provides an evaluation of the energy content of printed circuit boards. Density-based separation was used to separate various components of the NMF to increase the energy content in specific density fractions while reducing the metal content. The result showed that the energy content before and after the removal of the metallic fraction from PCBs was 9 and 15 GJ/t, respectively. After the density-based separation of the NMF, the energy content in the lightest fraction increased to 21 GJ/t, while reducing the concentration of the hazardous flame retardants. The contents of the hazardous flame retardants and residual metal were analyzed, to evaluate the harmful effect of emissions produced from utilizing the NMF as an alternative feedstock in waste-to-energy applications. View Full-Text
Keywords: e-waste; printed circuit boards; resins; fiberglass; calorific value; energy recovery e-waste; printed circuit boards; resins; fiberglass; calorific value; energy recovery
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kumar, A.; Kuppusamy, V.K.; Holuszko, M.E.; Janke, T. Improving the Energy Concentration in Waste Printed Circuit Boards Using Gravity Separation. Recycling 2018, 3, 21.

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