METHOD FOR EXTRACTING RARE EARTH ELEMENTS FROM PHOSPHOGYPSUM

The present invention relates to methods for recovering rare earth elements, in particular, from phosphogypsum. The claimed method comprises acidic extraction of rare earth elements from phosphogypsum using sulfuric acid-nitric acid mixture solution at 3.2-1.2 ratio with concentration of 1-3 % by we...

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Hauptverfasser:	ABRAMOV, YAKOV KUZMICH, VESELOV, VLADIMIR MIHAILOVICH, TAMURKA, VITALY GRIGOREVICH, GUKASOV, NIKOLAY ALEKSANDROVICH, MOTOVILOVA, LJUBOV' VIKTOROVNA, ARGUNOV, NIKOLAY DMITRIEVICH, BOGDANOVA, LIDIJA PETROVNA, ZALEVSKY, VIKTOR MIHAILOVICH, EVDOKIMOV, VLADIMIR DMITRIEVICH
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS FERROUS OR NON-FERROUS ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The present invention relates to methods for recovering rare earth elements, in particular, from phosphogypsum. The claimed method comprises acidic extraction of rare earth elements from phosphogypsum using sulfuric acid-nitric acid mixture solution at 3.2-1.2 ratio with concentration of 1-3 % by weight and at liquids-solids ratio of 4-5 within 8-12 minutes with simultaneous hydroacoustic action on the extraction suspension agent being mixed succeeded by separation of insoluble gypsum from extraction suspension agent and by recovery of rare earth elements from extraction solution using cation-exchange sorption by passing the latter through cation-exchange filter. The claimed method allows both to increase the recovery rate of rare earth elements and to reduce by half the time of the process accomplished at lower concentrations and with smaller volumes of acidic reagents.