Extraction of Cobalt and Lithium from Sulfate Solution Using Di(2-ethylhexyl)phosphoric Acid/Kerosene Mixed Extractant


The solvent extraction behavior of cobalt and lithium from mixed sulfate solution using di(2-ethylhexyl)phosphoric acid (D2EHPA)/kerosene as extractant system has been investigated. The effect of different process parameters such as pH of feed solution, extractant concentration, cobalt and lithium ion concentrations in the feed solution have been studied. Extraction equilibrium constants have been calculated and found to be log Kex Co = –2.01 and log Kex Li = –2.42. The highest separation factor of 292 was achieved using 1.59 M D2EHPA at pH 1.85 from mixed sulfate solution. 93.9% of cobalt and 11.4% lithium was co-extracted from 0.01 M cobalt and lithium sulfate solution. Extraction of cobalt-lithium by D2EHPA is affected by cation exchange mechanism, cobalt is extracted as [Co(HA2)2] and [CoA2] depending on the metal concentration in the feed solution while the lithium is extracted as [Li(A2H)]. Quantitative extraction of cobalt was achieved in two-stage counter-current batch extraction (with McCabe–Thiele plot) using 0.477 M D2EHPA at an O : A phase ratio of 1. The data obtained from loaded organic and raffinate indicate a composition which reveals nearly complete extraction of cobalt and rejection of lithium resulting significant separation of these elements from mixed sulfate solution.

This is a preview of subscription content, log in to check access.

Fig. 1.
Fig. 2.
Fig. 3.
Fig. 4.
Fig. 5.
Fig. 6.


  1. 1

    C. K. Lee and K. I. Rhee, Hydrometallurgy 68, 537 (2003).

    Google Scholar 

  2. 2

    S. M. Shin, N. H. Kim, J. S. Sohn, D. H. Yang, and Y. H. Kim, Hydrometallurgy 79, 172 (2005).

    CAS  Article  Google Scholar 

  3. 3

    M. Contestabile, S. Panero, and B. Scrosati, J. Power Sources 92, 65 (2001).

    CAS  Article  Google Scholar 

  4. 4

    P. Zhang, T. Yokoyama, O. Itabashi, T. M. Suzuki, and K. Inoue, Hydrometallurgy 47, 259 (1998).

    CAS  Article  Google Scholar 

  5. 5

    C. K. Lee and K. I. Rhee, J. Power Sources 109, 17 (2002).

    CAS  Article  Google Scholar 

  6. 6

    D. S. Kim, J. S. Sohn, C. K. Lee, K. I, K. S. Han, and Y. I. Lee, J. Power Sources 132, 145 (2004).

    CAS  Article  Google Scholar 

  7. 7

    J. M. Nan, D. M. Han, M. J. Yang, M. Cu, and X. L. Hou, Hydrometallurgy 47, 75 (2006).

    Article  Google Scholar 

  8. 8

    B. Swain, J. Foeng, J. C. Lee, and G. H. Lee, Hydrometallurgy 84, 130 (2006).

    CAS  Article  Google Scholar 

  9. 9

    B. Swain, J. Jeong, J. C. Lee, G. H. Lee, and J.-S. Sohna, J. Power Sources 167, 536 (2007)

    CAS  Article  Google Scholar 

  10. 10

    Y. Pranolo and C. Y. Cheng, CSIRO Minerals Report No. DMR 2598 (2005), p. 1.

    Google Scholar 

  11. 11

    B. Swain, J. Jeong, J.-C. Lee, and G. H. Lee, Sep. Purif. Technol. 63, 360 (2008).

    CAS  Article  Google Scholar 

  12. 12

    B. Swain, J. Jeong, K. Yoo, and J. C. Lee, Hydrometallurgy 101, 20 (2010)

    CAS  Article  Google Scholar 

  13. 13

    Y. Pranolo, W. Zhang, and C. Y. Cheng, Hydrometallurgy 102, 37 (2010)

    CAS  Article  Google Scholar 

  14. 14

    J. Xu, H. R. Thomas, R. W. Francis, K. R. Lum, and J. W. B. Liang, J. Power Sources 177, 512 (2008).

    CAS  Article  Google Scholar 

  15. 15

    H. Svedsen, G. Schei, and M. Osman, Hydrometallurgy 25, 197 (1990).

    Article  Google Scholar 

  16. 16

    G. L. Tulasi and S. Kumar, AIChE J. 45, 2534 (1999).

    CAS  Article  Google Scholar 

  17. 17

    T. Hano, M. Matsumoto, T. Ohtake, N. Egashira, and F. Hori, Solvent Extract. Ion Exchange 10, 195 (1992).

    CAS  Article  Google Scholar 

  18. 18

    P. Zhang, T. Y. Osamu, I. Tshishige, M. Suzuki, and K. Inoue, Hydrometallurgy 47, 259 (1998).

    CAS  Article  Google Scholar 

  19. 19

    G. M. Ritcey and A. W. Ashbrook, Solvent Extraction, Principles and Applications to Process Metallurgy, Part 1 (Elsevier, Amsterdam, 1984).

    Google Scholar 

  20. 20

    M. L. Brisk and W. J. McManamey, J. Appl. Chem. 19, 103 (1969).

    CAS  Article  Google Scholar 

  21. 21

    R. S. Juang and J. Y. Su, Ind. Eng. Chem. Res. 31, 239 (1992).

    Google Scholar 

  22. 22

    W. P. C. Duyvesteyn, D. A. Neudorf, and E. M. Weenink, US Patent No. 6350420B1 (2002).

  23. 23

    P. Zhang, T. Yokoyama, T. M. Suzuki, and K. Inoue, Hydrometallurgy 61, 223 (2001).

    CAS  Article  Google Scholar 

Download references

Author information



Corresponding author

Correspondence to Yamina Boukraa.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Yamina Boukraa Extraction of Cobalt and Lithium from Sulfate Solution Using Di(2-ethylhexyl)phosphoric Acid/Kerosene Mixed Extractant. Russ. J. Phys. Chem. 94, 1136–1142 (2020). https://doi.org/10.1134/S0036024420060321

Download citation


  • cobalt
  • lithium
  • solvent extraction
  • separation factor
  • di(2-ethylhexyl)phosphoric acid (D2EHPA)