Conclusions
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1.
The composition of complex compounds of the REE, formed during their elution from an ion-exchange resin by solutions of salts of nitrilotriacetic acid, was studied.
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2.
The separation of mixtures of REE is accomplished on account of mono- and dinitrilotriacetates. In the adsorption zone, mononitrilotriacetates LnX predominate, while in the zone of separation, saturated with NH +4 ions or “retaining ions” (Cu2+), the mononitrilotriacetates are converted to dinitrilotriacetates [LnX2]3−.
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3.
When the resin of the zone of separation is saturated with Cu2+ ions, there is practically no contact between the REE nitrilotriacetates and the resin in the Cu2+-form. The retaining action of Cu2+ is associated with the formation of a layer of resin with an increased content of hydrogen ions between the zone of CuR2 and the zone of LnR3.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 1945–1952, September, 1968.
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Martynenko, L.I., Mitrofanova, N.D. & Spitsyn, V.I. Mechanism of the ion-exchange separation of mixtures of rare earth elements during elution with solutions of nitrilotriacetic acid. Russ Chem Bull 17, 1854–1861 (1968). https://doi.org/10.1007/BF00904970
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DOI: https://doi.org/10.1007/BF00904970