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2 142 656

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Application

97107557/12, 1997-05-07

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Start date

1997-05-07

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Actual filing date

1997-05-07

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Published

1999-12-10

(72)

Inventor

Krasil'Nikov V.A.Andreev G.G.Levshanov A.S.Guzeeva T.I.Kobzar' Ju.F.Zhiganov A.N.Ledovskikh A.K.Zajtseva T.S.Portnjagina Eh.O.Sherin N.N.Shedikov V.P.

(73)

Holder

Tomskij Politekhnicheskij Universitet

THORIATED TUNGSTEN WASTE RECOVERY PROCESS Russian patent published in 1999 - IPC

Abstract RU 2142656 C1

FIELD: recovery of wastes containing precious elements or those environmentally harmful. SUBSTANCE: thoriated tungsten wastes are fluorinated with element fluorine having stoichiometric excess of 15-20% at initial temperature of 180- 300 C. Tungsten hexafluoride obtained in the process changes to gas phase and is removed from reactor. Thorium tetrafluoride is concentrated in solid residue. Tungsten hexafluoride is condensed at -18 to -25 C and used to produce tungsten powder, coatings, and compact items using hydrogen reduction process. Thorium tetrafluoride is conveyed to recovery or disposal areas. EFFECT: facilitated procedures in handling radioactive wastes and reduced power requirement. 2 cl, 1 dwg

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RU 2 142 656 C1

Authors

Krasil'Nikov V.A.

Andreev G.G.

Levshanov A.S.

Guzeeva T.I.

Kobzar' Ju.F.

Zhiganov A.N.

Ledovskikh A.K.

Zajtseva T.S.

Portnjagina Eh.O.

Sherin N.N.

Shedikov V.P.

Dates

1999-12-10—Published

1997-05-07—Filed

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