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2 243 859

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IPC

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Application

2003108772/02, 2003-03-28

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Start date

2003-03-28

(22)

Actual filing date

2003-03-28

(45)

Published

2005-01-10

(72)

Inventor

Andreev G.G.Krasil'Nikov V.A.Guzeeva T.I.Voroshilov F.A.Makarov F.V.Dubov A.G.Stolbov V.P.

(73)

Holder

Tomskij Politekhnicheskij Universitet

METHOD FOR PRODUCING POWDERS OF REFRACTORY METALS Russian patent published in 2005 - IPC

Abstract RU 2243859 C2

FIELD: processes for making powders of molybdenum, tungsten and rhenium by reduction of ammonium salts for further using them for producing hexafluorides of respective metals and in gas-fluoride technique.

SUBSTANCE: method is realized by reducing ammonium salts of refractory metals by hydrogen. Method comprises steps of reducing ammonium salts at temperature 350 - 550 C while using hydrogen of hydrogen-containing gas generated in cathode space of electrolyzer for producing fluorine and containing, vol. %: hydrogen, 92 - 94; hydrogen fluoride 5 - 6; inert impurities, the balance.

EFFECT: simplified lowered-cost manufacturing process.

1 dwg, 1 tbl, 3 ex

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RU 2 243 859 C2

Authors

Andreev G.G.

Krasil'Nikov V.A.

Guzeeva T.I.

Voroshilov F.A.

Makarov F.V.

Dubov A.G.

Stolbov V.P.

Dates

2005-01-10—Published

2003-03-28—Filed