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Recovery of Samarium and Cobalt from Sm–Co Magnet Waste Using a Phosphonium Ionic Liquid Cyphos IL 104

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Abstract

Due to outstanding thermal stability and corrosion resistance, samarium–cobalt alloy is being used in rare earth magnet. So, this permanent magnet waste can be a potential source for rare earth metal samarium and critical metal cobalt. Recovery and reuse of Sm, Co from Sm–Co magnet waste can reduce the burden on primary resources and environmental issues related to primary resources. In this work, a hydrometallurgical method for recovery of samarium and cobalt from Sm–Co magnet waste has been developed using an ionic liquid Cyphos IL 104. The optimum separation condition for cobalt and samarium has been determined by varying the concentration of HCl, NaCl, and mixture of HCl and NaCl in the leach liquor. The McCabe–Thiele plot is constructed using 0.075 mol/L Cyphos IL 104. Three counter-current stages at A:O ratio of 1:1.5 are needed for complete extraction of cobalt into the ionic liquid phase leaving samarium in the raffinate. Precipitation stripping of cobalt from the loaded organic is carried out using oxalic acid and the cobalt oxalate, thus formed, is calcined at 450 °C to form Co3O4. The raffinate obtained from the counter-current extraction contains 2.02 g/L Sm and 0.02 mg/L Co. Sm2O3 from raffinate is produced by precipitation of samarium with oxalic acid followed by calcination of samarium oxalate at 800 °C. Both the oxide products are confirmed by XRD.

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Acknowledgements

We are grateful to the authorities of ‘S ‘O’ A [Deemed to be University]’ for their constant encouragement to accomplish the research work.

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Authors and Affiliations

  1. Department of Chemistry, Institute of Technical Education and Research, Siksha ‘O’Anusandhan [Deemed to be University], Bhubaneswar, Odisha, 751030, India

    Bibhuti Bhusan Mishra & Niharbala Devi

  2. Biofuels and Bioprocessing Research Center, Siksha ‘O’Anusandhan [Deemed to be University], Bhubaneswar, Odisha, 751030, India

    Niharbala Devi

  3. CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, Odisha, 751013, India

    Kadambini Sarangi

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  1. Bibhuti Bhusan Mishra
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  2. Niharbala Devi
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Correspondence to Niharbala Devi.

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The contributing editor for this article was Brajendra Mishra.

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Mishra, B.B., Devi, N. & Sarangi, K. Recovery of Samarium and Cobalt from Sm–Co Magnet Waste Using a Phosphonium Ionic Liquid Cyphos IL 104. J. Sustain. Metall. 6, 410–418 (2020). https://doi.org/10.1007/s40831-020-00283-6

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  • DOI: https://doi.org/10.1007/s40831-020-00283-6

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