Russian Journal of Applied Chemistry

, Volume 91, Issue 10, pp 1665–1670 | Cite as

Extraction of Rare-Earth Elements in Hydrofluoride Decomposition of Loparite Concentrate

  • G. F. KrysenkoEmail author
  • D. G. Epov
  • M. A. Medkov
  • P. V. Sitnik
  • V. A. Avramenko
Inorganic Synthesis and Industrial Inorganic Chemistry


Distribution and existence forms of rare-earth elements in decomposition of the loparite concentrate with ammonium hydrofluoride were studied. It was found that, in the course of the aqueous leaching of the fluorinated concentrate, rare-earth elements fully remain in the insoluble residue as complex salts of general formula NaLnF4. The process of pyrohydrolysis of the insoluble residue was examined. It was shown that varying the process conditions always results in that a NaLnF4-containing product is obtained. It was found that rare-earth elements can be extracted from the insoluble residue and separated from calcium and thorium, and the conditions for this extraction were determined.


loparite concentrate rare-earth elements ammonium hydrofluoride fluoroammonium salts pyrohydrolysis leaching 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Hedrick, J.B., Sinha, S.P., and Kosynkin, V.D., J. Alloys Compd., 1997, vol. 250, nos. 1–2, pp. 467–470.CrossRefGoogle Scholar
  2. 2.
    RF Patent 2 182 887 (publ. 2002).Google Scholar
  3. 3.
    US Patent 7 182 925 (publ. 2007).Google Scholar
  4. 4.
    Dyachenko, A.N. and Kraidenko, R.I., Bull. Tomsk. Polytech. Univ., 2007, vol. 311, no. 3, pp. 35–38.Google Scholar
  5. 5.
    Zhang, W., Hu, Z., Liu, Y., Chen, H., Gao, S., and Gaschnig, R.M., Anal. Chem., 2012, vol. 84, no. 24, pp. 10686–10693.CrossRefGoogle Scholar
  6. 6.
    Krysenko, G.F., Epov, D.G., Medkov, M.A., Merkulov, E.B., Ivannikov, S.I., and Nikolaev, A.I., Russ. J. Appl. Chem., 2016, vol. 89, no. 4, pp. 522–528).CrossRefGoogle Scholar
  7. 7.
    Rakov, E.G., Ftoridy ammoniya: Itogi nauki i tekhniki. Neorganicheskaya khimiya (Ammonium Fluorides: Advances of Science and Technology, Inorganic Chemistry), vol. 15, Moscow: VINITI, 1988.Google Scholar
  8. 8.
    Malcolm W. Wilding and Donald W. Rhodes, J. Chem. Eng. Data, 1970, vol. 15, no. 2, pp. 297–298.CrossRefGoogle Scholar
  9. 9.
    Rakov, E.G. and Teslenko, V.V., Pirogidroliz neorganicheskikh ftoridov (Pyrohydrolysis of Inorganic Fluorides), Moscow: Energoatomizdat, 1987.Google Scholar
  10. 10.
    Sobolev, B.P., The Rare Earth Trifluorides, Barcelona: Institut d´Estudis Catalans, 2000.Google Scholar
  11. 11.
    RF Patent 2 171 303 (publ. 2001).Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • G. F. Krysenko
    • 1
    Email author
  • D. G. Epov
    • 1
  • M. A. Medkov
    • 1
  • P. V. Sitnik
    • 2
  • V. A. Avramenko
    • 1
    • 2
  1. 1.Institute of Chemistry, Far-Eastern BranchRussian Academy of SciencesVladivostokRussia
  2. 2.Far-Eastern Federal UniversityVladivostokRussia

Personalised recommendations