Аннотация:The rocks of Lovozero massif contain high concentration of rare-earth elements. We studied leaching of these elements from porphyric 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 from porphyric 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 are leached by solutions of ammonium oxalate, trilon B and ammonium difluoride. Selective extraction of Ce is characteristic for ammonium difluoride solution; ammonium oxalate solution, on the contrary, extracts Ce worse than other elements. Thus, combination of HCl solution with ammonium oxalate and ammonium difluoride solutions raises enhancement of leaching as compared with pure solutions.
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.
