Chemistry of inorganic compounds – Radioactive – Uranium compound
Reexamination Certificate
2009-07-20
2010-11-02
Bos, Steven (Department: 1793)
Chemistry of inorganic compounds
Radioactive
Uranium compound
C423S253000, C423S258000, C423S483000, C423S019000
Reexamination Certificate
active
07824640
ABSTRACT:
The present invention provides a two-step process for producing nuclear grade, active uranium dioxide (UO2) powder in which the first step comprises reacting uranium hexafluoride (UF6) with steam in a flame reactor to yield uranyl fluoride (UO2F2); and the second step comprises removing fluoride and reducing UO2F2to uranium dioxide (UO2) in a kiln under a steam/hydrogen atmosphere. The two-step process, each step separated by a positive sealed valve means to prevent gas, particularly H2flow back, tightly controls the exothermicity of the reaction, which allows for a very tight temperature control which controls the growth of the particles and results in UO2powder that is active and of consistent morphology.
REFERENCES:
patent: 3168369 (1965-02-01), Stanton et al.
patent: 3179491 (1965-04-01), Ukaji et al.
patent: 3235327 (1966-02-01), Clarke et al.
patent: 3765844 (1973-10-01), Rode
patent: 3786120 (1974-01-01), De Hollander et al.
patent: 3790493 (1974-02-01), Jeter et al.
patent: 3796672 (1974-03-01), Dada et al.
patent: 3819804 (1974-06-01), De Hollander
patent: 3906081 (1975-09-01), Welty
patent: 3970581 (1976-07-01), Jeter et al.
patent: 4005042 (1977-01-01), Dada
patent: 4020146 (1977-04-01), Knudsen
patent: 4031029 (1977-06-01), Colter et al.
patent: 4053559 (1977-10-01), Hart et al.
patent: 4090976 (1978-05-01), DeHollander et al.
patent: 4112055 (1978-09-01), Artaud
patent: 4397824 (1983-08-01), Butler et al.
patent: 4808390 (1989-02-01), Tanaka et al.
patent: 4830841 (1989-05-01), Urza
patent: 4889663 (1989-12-01), Michel
patent: 5091120 (1992-02-01), Feugier et al.
patent: 5723100 (1998-03-01), Carter et al.
patent: 5752158 (1998-05-01), Stephenson et al.
patent: 5757087 (1998-05-01), Carter et al.
patent: 5875385 (1999-02-01), Stephenson et al.
patent: 6136285 (2000-10-01), Feugier
patent: 6656391 (2003-12-01), Bonnerot et al.
patent: 7374940 (2008-05-01), Feugier
patent: 7422626 (2008-09-01), Feugier
patent: 1323769 (1963-03-01), None
patent: 2060242 (1971-06-01), None
patent: 2512801 (1982-09-01), None
patent: 1341379 (1973-12-01), None
patent: 95/32921 (1995-12-01), None
patent: 95/33689 (1995-12-01), None
patent: WO 95/32921 (1995-12-01), None
patent: 01/58810 (2001-08-01), None
patent: 02/47794 (2002-06-01), None
I & Wilton, Bush Wilton valves, http://www.bushandwilton.com/usa/index.htm, 1 page, Apr. 27, 2009.
Bush & Wilton, Rotary Airlocks, Universal Range If “U” Series, http://www.bushandwilton.com/usa/BW—RotaryAirlocks—USA.pdf , 2 pages.
Mott Corporation Brochure, Sintered Metal Filters for Hot and Corrosive Liquid and Gas Applications, 14 pages, Rev. Oct. 2008.
Union Carbide Nuclear Company, T. Shapiro et al., Porous Metal Filters, Application to Feed Materials Production, 24 pages, Jun. 15, 1961.
Bos Steven
Westinghouse Electric Co. LLC
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