Leaching of rare-earth and radioactive elements from lovozerite lujavrite (Lovozero alkaline massif, Kola Peninsula)тезисы доклада Тезисы

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[1] Ermolaeva V. N., Mikhailova A. V., Kogarko L. N. Leaching of rare-earth and radioactive elements from lovozerite lujavrite (lovozero alkaline massif, kola peninsula) // Alkaline Magmatism of the Earth and Related Strategic Metal Deposits. Proceedings of XXXII International Conference. Apatity 7-14. — Moscow.: GEOKHI RAS, 2015. — P. 40–42. We studied leaching of rare-earth and radioactive elements from lovozerite lujavrite, which is rare-metal ore, with different reagents in order to determine the most effective ones. As a reagents for leaching, we used 4% solution of HCl, 2% solutions of ammonium oxalate, trilon B and ammonium difluoride, as well as mixtures (1:1) of HCl solution with 2% solutions of ammonium oxalate, trilon B and ammonium difluoride. The determination of the elements was carried out by using of ICP MS method. The results of leaching show, that REE and Th from lovozerite lujavrite are leached most effective by mixtures of HCl solution with ammonium oxalate, trilon B and ammonium difluoride solutions, as well as by HCl solution. Somewhat smaller quantities of REE and Th are leached by solutions of ammonium oxalate, trilon B and ammonium difluoride. U are leached most effective by mixtures of HCl solution with ammonium oxalate, trilon B and ammonium difluoride solutions, as well as by HCl and ammonium difluoride solutions. Thus a mixtures of HCl solution with trilon B and ammonium difluoride more effective extracts LREE, and mixture of HCl solution with ammonium oxalate – HREE. This work is important from the practical point of view: the high contents of rare (including rare-earth) elements in alkaline rocks of Lovozero massif make it possible to consider it as potential object for their industrial extraction. In comparison with porphyric lujavrite (Ermolaeva et al., 1014) single solutions of ammonium oxalate, trilon B and ammonium difluoride leaching some smaller quantities of REE, Th and U. In case of leaching with other solutions we observe similar result for lovozerite and porphyric lujavrite. Unlike lovozerite lujavrite for porphyric lujavrite we can see Ce maximum for ammonium difluoride leaching and Th minimum for HCl+ammonium difluoride solution.

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