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Recycling Waste Crystalline Silicon Photovoltaic Modules by Electrostatic Separation

  • Innovations in WEEE Recycling
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Abstract

Photovoltaic (PV) modules contain both valuable and hazardous materials, which makes their recycling meaningful economically and environmentally. The recycling of the waste of PV modules is being studied and implemented in several countries. Current available recycling procedures include either the use of high-temperature processes, the use of leaching agents or a combination of both. In this study, waste of silicon-based PV modules are separated using an electrostatic separator after mechanical milling. An empirical study is used to verify if the separation works and to select and fix several parameters. Rotation speed of the roller and DC voltage are evaluated as a result of the separation of metals (silver and copper), silicon, glass, and polymers. The efficiency of metals’ separation is determined by acid leaching of the corresponding fractions followed by inductively coupled plasma optical emission spectrometry (ICP-OES); that of polymer separation is determined by mass difference due to combustion of the corresponding fractions; and those of glass and silicon quantities are determined by X-ray diffraction (XRD) followed by characterization using Rietveld quantitative phase analysis (RQPA). It is shown that the optimal separation is obtained under different operating voltages of 24 and 28 kV and a rotation speed of 30 RPM or higher. Furthermore, it is shown that there is no significant difference among the tested parameters. Results provide a new option in the recycling of waste of silicon PV modules that can and should be optimized.

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Acknowledgements

The authors are grateful to Capes, CNPq, FINEP, and FAPERGS (Brazil) for their financial support.

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Authors and Affiliations

  1. Programa de Pós-Graduação em Engenharia de Minas, Metalúrgica e de Materiais (PPGE3M), Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves, 9500, Porto Alegre, RS, 91509-900, Brazil

    Pablo Dias, Lucas Schmidt, Andrea Bettanin, Hugo Veit & Andréa Moura Bernardes

  2. Faculty of Science and Engineering, Macquarie University, Sydney, NSW, 2109, Australia

    Pablo Dias

  3. X-Ray Diffraction Laboratory, Geosciences Institute, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves, 9500 - Prédio 43126 - Sala 211, Caixa Postal 15001, Porto Alegre, RS, 91501-970, Brazil

    Lucas Bonan Gomes

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  1. Pablo Dias
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Correspondence to Pablo Dias.

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The contributing editor for this article was Bernd Friedrich.

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Dias, P., Schmidt, L., Gomes, L.B. et al. Recycling Waste Crystalline Silicon Photovoltaic Modules by Electrostatic Separation. J. Sustain. Metall. 4, 176–186 (2018). https://doi.org/10.1007/s40831-018-0173-5

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