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IPC

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Application

97104369/02, 1997-03-20

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Actual filing date

1997-03-20

(45)

Published

1998-10-20

(72)

Inventor

Agapitov V.A.Baluev V.A.Balueva N.S.Kunaev N.A.Krasnoshchekov V.I.Chekanov Ju.A.Balanovskij N.V.Lositskij A.F.

(73)

Holder

Otkrytoe Aktsionernoe Obshchestvo Mekhanicheskij Zavod"

METHOD OF REGENERATING NITRATE-FLUORIDE ZIRCONIUM-CONTAINING ETCHING SOLUTIONS Russian patent published in 1998 - IPC

Abstract RU 2120497 C1

FIELD: etching processes. SUBSTANCE: invention concerns etching solutions containing nitric and hydrofluoric acid salts and can be used in technology of metal-containing precipitates' isolation. Zirconium fluoride compounds are isolated by concentrating nitric acid to 750-900 g/l at fluorine to zirconium molar ratio (6- 7):1 followed by ageing for 10-15 hr, separation of crystals, adjusting remaining solution to its initial composition, and returning it into etching stage. Concentration process is accomplished by adding concentrated nitric acid or by evaporation. EFFECT: increased isolation of zirconium and simplified regeneration of etching solutions. 2 cl, 1 tbl, 8 ex

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RU 2 120 497 C1

Authors

Agapitov V.A.

Baluev V.A.

Balueva N.S.

Kunaev N.A.

Krasnoshchekov V.I.

Chekanov Ju.A.

Balanovskij N.V.

Lositskij A.F.

Dates

1998-10-20—Published

1997-03-20—Filed