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Modeling the Electromagnetic Processing of Recycled Silicon Dust

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REWAS 2016

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Abstract

The kerf waste from the sawing of PV silicon wafers is pelletized and then remelted in an induction furnace. The furnace has a square cross-section quartz crucible, surrounded by graphite susceptors and heated by an induction coil that enables directional solidification of the new ingot. Top and bottom ‘pancake’ coils provide additional temperature control. Once melted, silicon becomes electrically conductive and subject to stirring by induction. To recycle the silicon, particulate impurities (due to the sawing, condensed silicon oxides or carbides) need to be removed. Flow control and the electromagnetic Leenov-Kolin force are used to expel particulates, through a novel dual frequency induction scheme. Three-dimensional numerical modeling captures the electromagnetic, fluid-flow and heat-transfer effects in this problem, in a multi-physics finite volume computational framework. Results are presented for typical electromagnetic, velocity and force fields and conclusions are drawn about the expected effectiveness of the electromagnetic separation system which is still under construction.

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Author information

Authors and Affiliations

  1. University of Greenwich, Park Row, London, SE10 9LS, UK

    G. Djambazov, K. Pericleous & V. Bojarevics

  2. Universita degli Studi di Padova, Via 8 Febbraio 1848, 2, Padova, 35122, Italy

    M. Forzan & F. Dughiero

Authors
  1. G. Djambazov
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  2. K. Pericleous
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  3. V. Bojarevics
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  4. M. Forzan
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  5. F. Dughiero
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Editor information

Editors and Affiliations

  1. Department Materials Engineering of KU Leuven, Belgium

    Bart Blanpain (full professor, co-director for the I/UCRC ‘Center for Resource Recovery and Recycling’, co-editor-in-chief for the Journal of Sustainable Metallurgy) (full professor, co-director for the I/UCRC ‘Center for Resource Recovery and Recycling’, co-editor-in-chief for the Journal of Sustainable Metallurgy)

  2. Umicore Precious Metals Refining, Hoboken, Belgium

    Christina Meskers (senior manager and leading the Market Intelligence and Business Research team) (senior manager and leading the Market Intelligence and Business Research team)

  3. Department of Materials Science and Engineering, MIT, USA

    Elsa Olivetti (Thomas Lord Assistant Professor) (Thomas Lord Assistant Professor)

  4. Worcester Polytechnic Institute (WPI), USA

    Diran Apelian (Alcoa-Howmet Professor of Engineering and Founding Director of the Metal Processing Institute (MPI) & Brajendra Mishra (Kenneth G. Merriam Distinguished Professor of Mechanical Engineering and Assoc. Director of the Metal Processing Institute, Director of the National Science Foundation’s Industry/University Collaborative Research Center on Resource Recovery & Recycling) (Alcoa-Howmet Professor of Engineering and Founding Director of the Metal Processing Institute (MPI) &  (Kenneth G. Merriam Distinguished Professor of Mechanical Engineering and Assoc. Director of the Metal Processing Institute, Director of the National Science Foundation’s Industry/University Collaborative Research Center on Resource Recovery & Recycling)

  5. Purdue University, USA

    John Howarter (assistant professor in materials engineering) (assistant professor in materials engineering)

  6. SINTEF, Norway

    Anne Kvithyld (senior research scientist) (senior research scientist)

  7. IND LLC, USA

    Neale R. Neelameggham (‘The Guru’) (‘The Guru’)

  8. Argonne National Laboratory, USA

    Jeff Spangenberger (engineering specialist, Sr) (engineering specialist, Sr)

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© 2016 TMS (The Minerals, Metals & Materials Society)

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Djambazov, G., Pericleous, K., Bojarevics, V., Forzan, M., Dughiero, F. (2016). Modeling the Electromagnetic Processing of Recycled Silicon Dust. In: Kirchain, R.E., et al. REWAS 2016. Springer, Cham. https://doi.org/10.1007/978-3-319-48768-7_3

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