TREATMENT METHOD OF REE PHOSPHATE CONCENTRATE

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FIELD : chemistry. SUBSTANCE : invention relates to the treatment of phosphate concentrate of rare-earth elements (REE) obtained during the apatite complex processing, and can be used in industry to produce non-radioactive carbonate or hydroxide REE concentrate. Phosphate REE concentrate treatment is carried out comprising the impuritites of calcium, thorium, aluminum and iron, when heating in the presence of sulfoxide cation 1.2 wt % with nitric acid, wherein fluorine-ion is injected in an amount determined according to the correlation. Sulfoxide cation absorbs REE and calcium, while phosphorus, fluorine and thorium transfer into the formed pulp during the concentrate processing. Then REE and calcium are desorbed from cation with ammonium nitrate solution to produce a desorbate. Thereafter, the desorbate is neutralized with ammonium compound to pH of 7.35-7.5 to produce a purified REE concentrate. EFFECT : exclusion of radioactive sulfoxide cation formation during its multiple using and consumption reduction of acid reagent and cation. 5 cl, 5 ex