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2 038 309

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C1

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IPC

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Application

4947625/26, 1991-06-21

(22)

Actual filing date

1991-06-21

(45)

Published

1995-06-27

(72)

Inventor

Karavajko G.I.Avakjan Z.A.Komissarova L.N.Mel'Nikov P.P.Voronchikhin D.A.Pushkina G.Ja.

(73)

Holder

Khimicheskij Fakul'Tet Mgu Im.M.V.LomonosovaInstitut Mikrobiologii Ran

METHOD OF YTTERBIUM EXTRACTION FROM PHOSPHORO-CONTAINING MINERAL RAW Russian patent published in 1995 - IPC

Abstract RU 2038309 C1

FIELD: ytterbium production. SUBSTANCE: apatite is treated with cultural fluid of fungus Rhizopus arrhizus. Ratio solid:liquid 1:(5-10), pH ~ 4,0 - 4,5. Under these conditions ytterbium is transformed to the solution selectively. Leaching of other rare-earth elements does not exceed 6.3% EFFECT: improved method of ytterbium extraction. 1 tbl

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RU 2 038 309 C1

Authors

Karavajko G.I.

Avakjan Z.A.

Komissarova L.N.

Mel'Nikov P.P.

Voronchikhin D.A.

Pushkina G.Ja.

Dates

1995-06-27—Published

1991-06-21—Filed

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