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Physical Processing of Discarded Integrated Circuits for Recovery of Metallic Values

  • Recycling Silicon and Silicon Compounds
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Abstract

Recycling of discarded integrated circuits is an important issue related to waste management, resource conservation, and metal recovery aspects. In this study, physical processing comprising water fluidization, magnetic separation, and density separation of discarded units was followed to recover Cu, Fe, Ni, and Si values. The fluidization technique provided an enriched metal concentrate comprising 53.05% Cu, 16.2% Fe, and 10.5% Ni in the underflow fraction, and the overflow fraction comprised 63.1% Si with 17.8% C. High metallic dissolution was attained for the processed samples compared with the feed leaching because of effective separation of the non-metallic fraction during physical processing. Overall, 1 kg of discarded ICs yielded ~ 120 g ferrous metal with ~ 57.4% Fe and ~ 26% Ni purity and ~ 390 g metallic values with 85% Cu and ~ 490 g non-metallic values with ~ 84% Si.

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Acknowledgements

The authors acknowledge the financial support received from the Indian Institute of Technology, Roorkee, through the Faculty Initiation Grant and are also thankful to the Institute Computer Center and the Institute Instrumentation Center for providing the discarded samples and characterization facilities, respectively.

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Authors and Affiliations

  1. Department of Metallurgical & Materials Engineering, Indian Institute of Technology, IIT-Roorkee, Roorkee, Uttarakhand, 247667, India

    Amit Barnwal & Nikhil Dhawan

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  1. Amit Barnwal
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  2. Nikhil Dhawan
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Correspondence to Nikhil Dhawan.

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Barnwal, A., Dhawan, N. Physical Processing of Discarded Integrated Circuits for Recovery of Metallic Values. JOM 72, 2730–2738 (2020). https://doi.org/10.1007/s11837-020-04137-0

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  • DOI: https://doi.org/10.1007/s11837-020-04137-0

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