Institute of the Industrial Ecology Problems of the North of the Kola Science Center of the Russian Academy of Sciences (INEP KSC RAS)

V. N. Lebedev, Senior Researcher, e-mail: Lebed_vn@chemy.kolasc.net.ru

V. A. Masloboev, Director

Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials of the Russian Academy of Sciences Kola Science Center (ICTREMRM KSC RAS).

V. I. Zakharov, Head of Laboratory

From solutions after the leaching of eudialyte concentrate by sulphuric acid mostly 20–30% of rare earth elements (REE) of the yttrium group are precipitated along with zirconium (IV) and other impurities in the precipitate of hydrates, from which the zirconium (IV) and niobium (V) is converted in the precipitate of basic sulfates and REE is recovered from a solution by means of oxalic acid. The method of the REE recovery from the calcium-silica sludge by the sodium chloride or calcium nitrate leaching is worked out.The method of the REE separation by solvent extraction from the solution after the hydrochloric acid leaching of eudialyte concentrate by means of the nitrate ions insertion in the chloride solution is proposed. The 5-stage countercurrent solvent extraction and purification process of the REE from the impurities from the solutions of the hydrochloride technology eudialyte is simulated. The possibility of the nitrate ions utilization by means of the solvent extraction of nitric acid from the electrolyte solutions containing hydrochloric acid is showcased.

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