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Scandium Extraction from Nickel Processing Waste Using Cyanex 923 in Sulfuric Medium

  • Rare Metal Recovery from Secondary Resources
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Abstract

Extraction of scandium (Sc) from nickel processing residue using Cyanex 923 was studied. Cyanex 923 showed better selectivity for Sc compared with the other metallic components in the residue. Scandium was extracted by solvent extraction via a solvation mechanism. The aqueous-to-organic (A/O) phase ratio was set at 1:2. An increase in the scandium extraction rate was observed when increasing the concentration of H+. Cyanex 923 was shown to be more selective for Sc than Fe. Coextracted Fe was removed from the organic phase by 3 mol L−1 H2SO4 scrubbing with Sc loss of 1.3%. Stripping of scandium from the organic phase of 84.3% was achieved using 4% oxalic acid solution. The precipitated scandium oxalate was recovered by filtration and calcination. The obtained scandium oxide presented minimum purity of 99.0%.

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Acknowledgements

Financial support for this study was provided by the São Paulo Research Foundation (FAPESP—Grant 2012/51871-9). This study was partly financed by the Coordination for the Improvement of Higher Education Personnel—Brazil (CAPES) Finance Code 001. The authors thank Ana Carolina Fadel Dalsin for her help on the project.

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Authors and Affiliations

  1. Chemical Engineering, University of São Paulo, Rua do Lago, 250, São Paulo, SP, CEP: 05508-080, Brazil

    Ariane Gaspari Oliveira Souza, Paula Aliprandini, Denise Crocce Romano Espinosa & Jorge Alberto Soares Tenório

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  1. Ariane Gaspari Oliveira Souza
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  2. Paula Aliprandini
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  3. Denise Crocce Romano Espinosa
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  4. Jorge Alberto Soares Tenório
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Correspondence to Paula Aliprandini.

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Souza, A.G.O., Aliprandini, P., Espinosa, D.C.R. et al. Scandium Extraction from Nickel Processing Waste Using Cyanex 923 in Sulfuric Medium. JOM 71, 2003–2009 (2019). https://doi.org/10.1007/s11837-019-03427-6

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  • DOI: https://doi.org/10.1007/s11837-019-03427-6

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