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2 158 317

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IPC

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Application

99103842/02, 1999-02-16

(24)

Start date

1999-02-16

(22)

Actual filing date

1999-02-16

(45)

Published

2000-10-27

(72)

Inventor

Lebedev V.N.Lokshin Eh.P.

(73)

Holder

Institut Khimii I Tekhnologii Redkikh Ehlementov I Mineral'Nogo Syr'Ja Im. I.V. Tananaeva Kol'Skogo Nauchnogo Tsentra Ran

METHOD OF ISOLATION OF RARE-EARTH ELEMENTS FROM PHOSPHOGYPSUM Russian patent published in 2000 - IPC

Abstract RU 2158317 C1

FIELD: mining industry. SUBSTANCE: invention relates to recovery of rare- earth elements in integrated processing of apatite. Solution, obtained after treatment of phosphogypsum with leaching solution containing 0.1-0.5 g- eq/l sulfuric acid, is neutralized with magnesium oxide or carbonate (e. g. magnesite) and precipitate containing rare-earth elements is filtered off. Magnesium sulfate solution obtained after separation of indicated precipitate and acidified with sulfuric acid can be used as leaching solution. EFFECT: improved filtration filterability of precipitate and enabled multiple reuse of leaching solution. 3 cl, 4 ex

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RU 2 158 317 C1

Authors

Lebedev V.N.

Lokshin Eh.P.

Dates

2000-10-27—Published

1999-02-16—Filed