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Extraction of Yttrium-Subgroup Rare Earth Elements with Aliquat 336

  • Inorganic Synthesis and Industrial Inorganic Chemistry
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Abstract

The extraction of rare earth metals with Aliquat 336 technical extractant (an ionic liquid based on a quaternary ammonium salt, trioctylmethylammonium chloride) was studied. The extractant was taken in the chloride and thiocyanate forms. The extractant in the thiocyanate form extracts rare earth metals more efficiently. The lutetium distribution in extraction with 1 M trioctylmethylammonium thiocyanate from chloride–thiocyanate solutions was studied. The extraction of lanthanides (with lutetium as example) is described by the equation Lu3+ + 3NCS– + 3[RRʹ3N]+NCS– = {(R3RʹN)3+∙[Lu(NCS)6]3–}org. Aqueous solutions of Lu3+ thiocyanates with different lutetium concentrations were studied by IR spectroscopy. A conclusion was made that the NCS– ion coordinates to the lutetium ion via nitrogen atom irrespective of the lutetium concentration. The distribution ratios were determined, and the separation factors in the extraction of rare earth metals with trioctylmethylammonium thiocyanate were calculated. The extraction and separation of rare earth metals are more efficient for the heavy lanthanides. Yttrium behaves under these conditions similarly to middle lanthanides. The 2 M trioctylmethylammonium thiocyanate–LnCl3–NH4NCS–Н2О extraction system was concluded to be suitable for the recovery and separation of yttrium-subgroup rare earth elements.

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ACKNOWLEDGMENTS

The authors are grateful to Dr. Sci. (Chem.) A.I. Mikhailichenko for the assistance in performing this study and to staff members of the Center for Shared Use Testing, Analytical, and Certification Center at Giredmet for the assistance in analytical studies of the experimental samples.

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Authors and Affiliations

  1. State Research and Designing Institute of Rare Metal Industry Giredmet, 111524, Moscow, Russia

    O. V. Yurasova, D. A. Samieva, I. M. Ermochenkov & S. A. Vasilenko

  2. Mendeleev University of Chemical Technology of Russia, 125047, Moscow, Russia

    S. N. Ivanova

Authors
  1. O. V. Yurasova
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  2. D. A. Samieva
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  3. S. N. Ivanova
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  4. I. M. Ermochenkov
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  5. S. A. Vasilenko
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Contributions

O.V. Yurasova: study of REM extraction kinetics, choice of conditions for efficient extraction of lutetium, and writing of Results and Discussion and Conclusion sections; D.A.Samieva: study of the extraction mechanism, data processing, and writing of Experimental and Results and Discussion sections; S.N. Ivanova: recording and interpretation of the IR spectra; I.M. Ermochenkov: analyses by iodometric, Volhard, potentiometric, and complexometric titration; S.A. Vasilenko: collection of literature data and preparation of the literature review.

Corresponding author

Correspondence to D. A. Samieva.

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The authors declare that they have no conflict of interest.

Additional information

Translated from Zhurnal Prikladnoi Khimii, No. 7, pp. 849–856, January, 2021 https://doi.org/10.31857/S0044461821070057

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Yurasova, O.V., Samieva, D.A., Ivanova, S.N. et al. Extraction of Yttrium-Subgroup Rare Earth Elements with Aliquat 336. Russ J Appl Chem 94, 903–910 (2021). https://doi.org/10.1134/S1070427221070065

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