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1. (WO2017200449) SEPARATION OF RARE EARTH ELEMENTS FROM OTHER ELEMENTS

Pub. No.:    WO/2017/200449    International Application No.:    PCT/SE2017/000025
Publication Date: Fri Nov 24 00:59:59 CET 2017 International Filing Date: Thu May 11 01:59:59 CEST 2017
IPC: C22B 59/00
B09B 3/00
C01F 17/00
C09K 11/01
H01J 9/52
H01M 6/52
H01M 10/54
Applicants: SEISENBAEVA, Gulaim A.
POLIDO LEGARIA, Elizabeth
KESSLER, Vadim
Inventors: SEISENBAEVA, Gulaim A.
POLIDO LEGARIA, Elizabeth
KESSLER, Vadim
Title: SEPARATION OF RARE EARTH ELEMENTS FROM OTHER ELEMENTS
Abstract:
A process for separating rare earth elements (REE) from Ca, Mg and other non-REE elements comprises raising the pH of an acidic aqueous solution of REE to pH 8 to pH 11; adding nano- or micro (NoM) particles having a silica or titanium oxide surface; agitating the suspension for 6 h to 48 h to provide for adherent crystallization of REE hydroxide on the particles; separating the particles from the solution; releasing REE by treatment with aqueous acid to form an aqueous solution of REE salt; separating them from the aqueous solution of REE salt formed. The acidic aqueous solution comprising REE is preferably provided by leaching of an REE mineral with aqueous acid; adding a base to bring the pH to from pH 4.0 to pH 6.5; separating precipitated non-REE hydroxide from the solution.