METHOD OF PROCESSING EUDIALYTE CONCENTRATE Russian patent published in 2014 - IPC C22B59/00 C22B34/14 C22B3/06 

FIELD: chemistry.

SUBSTANCE: method involves decomposing the concentrate with inorganic acid to obtain a gel, heat treatment of the gel, regenerating the acid, water leaching the gel with transfer of rare-earth elements into the solution and a zirconium compound into an insoluble residue. The solution is then separated from the residue and the zirconium compound is separated from the residue. The concentrate is decomposed with acid consumption of 90-110% stoichiometric amount, and heat treatment of the gel, water leaching of the gel and acid regeneration are carried out simultaneously in autoclave conditions at temperature of 175-250°C for 1-4 hours to obtain a solution of rare-earth elements containing a free acid. The zirconium compound is separated from the insoluble residue by wet gravity separation. The inorganic acid used is hydrochloric acid or nitric acid.

EFFECT: easy implementation and improved working conditions.

3 cl, 6 ex