Abstract
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.
Similar content being viewed by others
References
Hedrick, J.B., Sinha, S.P., and Kosynkin, V.D., J. Alloys Compd., 1997, vol. 250, nos. 1–2, pp. 467–470.
RF Patent 2 182 887 (publ. 2002).
US Patent 7 182 925 (publ. 2007).
Dyachenko, A.N. and Kraidenko, R.I., Bull. Tomsk. Polytech. Univ., 2007, vol. 311, no. 3, pp. 35–38.
Zhang, W., Hu, Z., Liu, Y., Chen, H., Gao, S., and Gaschnig, R.M., Anal. Chem., 2012, vol. 84, no. 24, pp. 10686–10693.
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).
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.
Malcolm W. Wilding and Donald W. Rhodes, J. Chem. Eng. Data, 1970, vol. 15, no. 2, pp. 297–298.
Rakov, E.G. and Teslenko, V.V., Pirogidroliz neorganicheskikh ftoridov (Pyrohydrolysis of Inorganic Fluorides), Moscow: Energoatomizdat, 1987.
Sobolev, B.P., The Rare Earth Trifluorides, Barcelona: Institut d´Estudis Catalans, 2000.
RF Patent 2 171 303 (publ. 2001).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © G.F. Krysenko, D.G. Epov, M.A. Medkov, P.V. Sitnik, V.A. Avramenko, 2018, published in Zhurnal Prikladnoi Khimii, 2018, Vol. 91, No. 10, pp. 1473−1479.
Rights and permissions
About this article
Cite this article
Krysenko, G.F., Epov, D.G., Medkov, M.A. et al. Extraction of Rare-Earth Elements in Hydrofluoride Decomposition of Loparite Concentrate. Russ J Appl Chem 91, 1665–1670 (2018). https://doi.org/10.1134/S1070427218100142
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1070427218100142