METHOD FOR PREPARATION OF SPHERICAL UO$sub 4$
Abstract
A method is given for continuously precipitating ura nium peroxide in the form of spherical particles. Seed crystals are formed in a first reaction zone by introducing an acidified aqueous uranyl nitrate solution and an aqueous hydrogen peroxide solution at a ratio of 5 to 20 per cent of the stoichiometric amount required for complete precipitation. After a mean residence time of 2 to 5 minutes in the first reaction zone, the resulting mixture is introduced into a second reaction zone, together with a large excess of hydrogen peroxide solution. The resulting UO4 is rapidly separated from the mother liquor after an over-all residence time of 5 to 11 minutes. The first reaction is maintained at a temperature of 85 to 90 deg C and the second zone above 50 deg C. Additional reaction zones may be employed for further crystal growth. The UO/sub 4/ is converted to U/sub 3/O/sub 8/ or UO/sub 2/ by heating in air or hydrogen atmosphere. This method is particularly useful for the preparation of spherical UO/sub 2/ particles 10 to 25 microns in diameter. (AEC)
- Inventors:
- Issue Date:
- Research Org.:
- Originating Research Org. not identified
- OSTI Identifier:
- 4840423
- Patent Number(s):
- 3037840
- Assignee:
- U.S. Atomic Energy commission
- Patent Classifications (CPCs):
-
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01G - COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- NSA Number:
- NSA-16-018981
- Resource Type:
- Patent
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- United States
- Language:
- English
- Subject:
- CHEMISTRY; AIR; CRYSTALLIZATION; CRYSTALS; EXPANSION; HEATING; HYDROGEN; HYDROGEN PEROXIDES; PARTICLES; PRECIPITATION; PREPARATION; SOLUTIONS; SPHERES; U3O8; URANIUM DIOXIDE; URANIUM OXIDES; URANYL NITRATES; WATER
Citation Formats
Gregory, Jr, J F, and Levey, Jr, R P. METHOD FOR PREPARATION OF SPHERICAL UO$sub 4$. United States: N. p., 1962.
Web.
Gregory, Jr, J F, & Levey, Jr, R P. METHOD FOR PREPARATION OF SPHERICAL UO$sub 4$. United States.
Gregory, Jr, J F, and Levey, Jr, R P. Fri .
"METHOD FOR PREPARATION OF SPHERICAL UO$sub 4$". United States.
@article{osti_4840423,
title = {METHOD FOR PREPARATION OF SPHERICAL UO$sub 4$},
author = {Gregory, Jr, J F and Levey, Jr, R P},
abstractNote = {A method is given for continuously precipitating ura nium peroxide in the form of spherical particles. Seed crystals are formed in a first reaction zone by introducing an acidified aqueous uranyl nitrate solution and an aqueous hydrogen peroxide solution at a ratio of 5 to 20 per cent of the stoichiometric amount required for complete precipitation. After a mean residence time of 2 to 5 minutes in the first reaction zone, the resulting mixture is introduced into a second reaction zone, together with a large excess of hydrogen peroxide solution. The resulting UO4 is rapidly separated from the mother liquor after an over-all residence time of 5 to 11 minutes. The first reaction is maintained at a temperature of 85 to 90 deg C and the second zone above 50 deg C. Additional reaction zones may be employed for further crystal growth. The UO/sub 4/ is converted to U/sub 3/O/sub 8/ or UO/sub 2/ by heating in air or hydrogen atmosphere. This method is particularly useful for the preparation of spherical UO/sub 2/ particles 10 to 25 microns in diameter. (AEC)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 1962},
month = {Fri Jun 01 00:00:00 EDT 1962}
}