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2 200 993

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IPC

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Application

2001106883/06, 2001-03-13

(24)

Start date

2001-03-13

(22)

Actual filing date

2001-03-13

(45)

Published

2003-03-20

(72)

Inventor

Zil'Berman B.Ja.Sytnik L.V.Gorskij A.G.Borovikov E.A.

(73)

Holder

Gosudarstvennoe Unitarnoe Predprijatie Nauchno-Proizvodstvennoe Ob"Edinenie Institut Im. V.G. Khlopina"

METHOD FOR RECOVERY OF IRRADIATED THORIUM MATERIALS Russian patent published in 2003 - IPC

Abstract RU 2200993 C2

FIELD: thorium decontamination for reuse. SUBSTANCE: proposed method involves dissolution of irradiated specimens in nitric acid and uranium-233 is extracted using scheme with aid of 3-5% solution of tributyl phosphate. Thorium, zirconium, and technetium are jointly extracted from raffinate in 30% solution of tributyl phosphate at HNO₃ concentration of 4-5 mole/l, Zr is separated by re-extraction in solution of acetohydroxamic acid and acetic acid whereupon Th is extracted in nitric acid of 0.2-0.4 mole/l concentration, and then Tc is separated from extract with aid of nitric solution of acetohydroxamic acid and hydrazine. EFFECT: provision for extracting thorium without zirconium and technetium admixtures and for eliminating salting waste solutions with aluminum nitrates. 4 cl, 1 dwg

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RU 2 200 993 C2

Authors

Zil'Berman B.Ja.

Sytnik L.V.

Gorskij A.G.

Borovikov E.A.

Dates

2003-03-20—Published

2001-03-13—Filed