METHOD OF EXTRACTING RARE EARTH METALS FROM NITROPHOSPHATE SOLUTION IN NITRIC ACID PROCESSING OF APATITE CONCENTRATE Russian patent published in 2015 - IPC C01F17/00 C22B59/00 

FIELD: chemistry.

SUBSTANCE: invention relates to field of recycling phosphate raw material, in particular to methods of extracting rare earth metals from apatite concentrate in nitric acid recycling of concentrate into complex fertilisers and can be used in chemical and accompanying fields of industry. Method of extracting rare earth metals includes sorption of rate earth metals from nitrophosphate solution by contact of sorbent material with nitrophosphate solution, with application of polyfunctional cationite with complex-forming ion-exchanges used as sorbent material, separation of saturated cationite from solution, washing and desorption of rare earth elements with desorbing solution, which contains ammonium nitrate and nitric acids, processing with desorbing solution, containing ammonium nitrate and nitric acid, processing obtained desorbant without thorium with ammonia-containing precipitator in one stage with sedimentation of rare earth when pH=2-4 is reached and separation of sediment of collective rare earth concentrate by filtration.

EFFECT: invention provides effective extraction of not less than 70% of rare earth metals, obtaining deactivated collective rare earth concentrate with high qualitative characteristics, as well as absence of difficult to utilise wastes, including radioactive ones.

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