IMPROVEMENTS IN OR RELATING TO SINTERED URANIUM DIOXIDE

Patent · Sun Apr 01 04:00:00 EST 1962

OSTI ID:4793455

A process is outlined for preparing sintered UO/ of high density and stoichiometric composition from ammonium uranate. In the process, ammonium uranate is calcined at 350 to 450 deg C for 5 to 20 hr, reduced in dry cracked NH3 in two stages, first at 350 to 450 deg C and second at 600 to 700 deg C, and reoxidized in the cold in an O/sub 2/-containing N/sub 2/ current. After incorporation of a molding additive, the oxide is compressed in vacuo, followed by crushing and screening, compressed again under a pressure of 2.5 to 5 metric tons/sub 2/cm/sub 2/, and, after removal of the molding additive, sintered in dry cracked NH3 for 5 hr at 1250 to 1400 deg C: One advantage of this method over one using uranium peroxide is shorter calcination time. (D.L.C.)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-16-015232
• OSTI ID: 4793455
• Report Number(s): GB 893061
• Country of Publication: United Kingdom
• Language: English

Related Subjects

AMMONIA
AMMONIUM COMPOUNDS
BARRIERS
CALCINATION
CASTING
COOLING
DECOMPOSITION
DENSITY
EFFICIENCY
GAS FLOW
HIGH TEMPERATURE
METALS, CERAMICS, AND OTHER MATERIALS
NITROGEN
ORE PROCESSING
OXIDATION
OXIDES
OXYGEN
PEROXIDES
PREPARATION
PRESSURE
PYROLYSIS
REDUCTION
SINTERED MATERIALS
TEMPERATURE
URANATES
URANIUM DIOXIDE
URANIUM OXIDES
VACUUM