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

  • Ariane Gaspari Oliveira Souza
  • Paula AliprandiniEmail author
  • Denise Crocce Romano Espinosa
  • Jorge Alberto Soares Tenório
Rare Metal Recovery from Secondary Resources


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%.



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.


  1. 1.
    Z. Liu, H. Li, Q. Jing, and M. Zhang, JOM 69, 2373 (2017).CrossRefGoogle Scholar
  2. 2.
    U.S. Geological Survey, Mineral Commodity Summaries 2015 (2015). Accessed 31 Jan 2018.
  3. 3.
    U.S. Geological Survey, Mineral Commodity Summaries 2013 (2013). Accessed 31 Jan 2018.
  4. 4.
    J. Gambogi, Minerals Yearbook Rare Earths (2015). Accessed 23 Nov 2017.
  5. 5.
    B. Onghena, C.R. Borra, T.V. Gerven, and K. Binnemans, Sep. Purif. Technol. 176, 208 (2017).CrossRefGoogle Scholar
  6. 6.
    S. Wang, JOM 65, 1317 (2013).CrossRefGoogle Scholar
  7. 7.
    L.T. Peiró and G.V. Méndez, JOM 65, 1327 (2013).CrossRefGoogle Scholar
  8. 8.
    F. Xie, T.A. Zhang, D. Dreisinger, and F. Doyle, Miner. Eng. 56, 10 (2014).CrossRefGoogle Scholar
  9. 9.
    W. Wang, Y. Pranolo, and C. Cheng, Metall. Sci Technol. 25, 11 (2007).Google Scholar
  10. 10.
    G. Gongyi, C. Yuli, and L. Yu, JOM 40, 28 (1988).CrossRefGoogle Scholar
  11. 11.
    B.R. Reddy, D.N. Priya, S.V. Rao, and P. Radhika, Hydrometallurgy 77, 253 (2005).CrossRefGoogle Scholar
  12. 12.
    B.R. Reddy and D.N. Priya, J. Power Sources 161, 1428 (2006).CrossRefGoogle Scholar
  13. 13.
    Cytec, Cyanex 272 extractant (Cytec Industries Inc., 2008). Accessed 20 July 2018.
  14. 14.
    K. Sarangi, P.K. Parhi, E. Padhan, A.K. Palai, K.C. Nathsarma, and K.H. Park, Sep. Purif. Technol. 55, 44 (2007).CrossRefGoogle Scholar
  15. 15.
    M. Haslam and B. Arnall, ALTA 1999—Nickel/Cobalt Pressure Leaching & Hydrometallurgy Forum (Perth, 1999).Google Scholar
  16. 16.
    C. Wang and D. Li, Solvent Extr. Ion Exchange 12, 615 (1994).CrossRefGoogle Scholar
  17. 17.
    L. Bykhovsky and L. Tigunov, International Geological Congress (Oslo, 2008).Google Scholar
  18. 18.
    D. Li and C. Wang, Hydrometallurgy 48, 301 (1998).CrossRefGoogle Scholar
  19. 19.
    Cytec, Cyanex 923 extractant (Cytec Industries Inc., 2008). Accessed 23 April 2018.
  20. 20.
    V. Ribeiro and R. Santos, Breve Revisão Bibliográfica dos Processos de Lixiviação de Minérios e Concentrados de Terras-Raras (Rio de Janeiro: CETEM/MCTI, 2014), pp. 14–15.Google Scholar
  21. 21.
    B. Gupta, A. Deep, P. Malik, and S.N. Tandon, Solvent Extr. Ion Exchange 20, 81 (2002).CrossRefGoogle Scholar
  22. 22.
    G. Ritcey, Solvent Extraction: Principles and Applications to Process Metallurgy (Ottawa: Elsevier, 2006), pp. 51–75.Google Scholar
  23. 23.
    V. Kislik, Solvent Extraction: Classical and Novel Approaches, 1st ed. (Amsterdam: Elsevier, 2012), pp. 323–326.Google Scholar
  24. 24.
    R. Vickery, J. Chem. Soc. 0, 3113 (1956).Google Scholar

Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Chemical EngineeringUniversity of São PauloSão PauloBrazil

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