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ArticleName Development of innovative sorption-extraction technology for obtaining high-purity (99.99%) rare-earth metal compounds when processing ultimate concentrates (on the example of the light group)
DOI 10.17580/tsm.2017.08.07
ArticleAuthor Gedgagov E. I., Tarasov A. V., Giganov V. G., Lunkova M. A.

JSC “Institute “GINTsVETMET”, Moscow, Russia:

E. I. Gedgagov, Head of Laboratory of Metallurgy and Dressing, e-mail:
A. V. Tarasov, Deputy R&D Director
V. G. Giganov, Head of Laboratory of Hydrometallurgical and Sorption-Extraction
M. A. Lunkova, Researcher


A research was made on conditions for obtaining of light-group REM compounds by using new industrial resins and extraction agents. This was the first usage of a frontal method of separation, performed directly in the phase of a saturated sulphocationite Lewatit MonoPlus SP112 with a macroporous structure, through processing of a thick layer of saturated resin with a quadrivalent solution of cerium and a subsequent extraction cleaning of an acid eluate from impurities with high separation coefficients in order to obtain any possible cerium (IV) compounds of the required purity. The used extraction agent was a reagent from a class of quaternary ammoniums. It was also shown that the usage of a strong-basic anionite with a porous structure, instead of the extraction agent Aliquat 336, lowers the cleaning indicators, which is due to regenerative features of hydrocarbon matrix of the anionite. With respect to deep cleaning of a lanthanum solution and other rare-earth metals (REM) from a cerium (IV) micro-impurity, it was the first time that a strongly thickening high-basic anionite (a high level of divinylbenzene) with a porous structure was researched and proposed. A fast method for separation of light-group REM, including a selective sorption of lanthanum from a mixed REM-solution with application of a complexing agent for bonding of REM parts to anionic compounds and a complexing sorbent, which makes it possible to remove lanthanum in a form of any high-pure compound; conditions were developed for regeneration of a complexing agent by returning it to a technological cycle and “soft” regimes of lanthanum sorption, which increases the lifetime of single load of the recommended sorbent in a multi-cycle process. The complexing agent used was an ethylenediaminetetraacetate acid based reagent. Regimes of extraction separation of praseodymium and neodiumium with obtainment of re-extracts, containing their individual compounds, were proposed. A process for fine cleaning of acid (рН < 1) eluates or re-extracts from impurities of non rare-earth metals by application of a new class of chelating and impregnated resins was researched. It was determined that the usage of these ionites in recommended scopes and according to each of the extracted metals-impurities, allows us to propose the most rational method for obtaining high-pure REM compounds. In particular, with respect to fine cleaning of re-extractors of cerium (IV), praseodymium, neodymium and eluate, an impregnated sorbent Lewatit TP272 was researched and is recommended for industrial use.

keywords Rare-earth metals, sorption, extraction, cationites, anionites, lanthanum, cerium, praseodymium, neodymium, complexing agent, desorption, re-extraction

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