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Title: 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 DTIE; NSA-16-018981
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, J.F. Jr., and Levey, R.P. Jr. METHOD FOR PREPARATION OF SPHERICAL UO$sub 4$. United States: N. p., 1962. Web.
Gregory, J.F. Jr., & Levey, R.P. Jr. METHOD FOR PREPARATION OF SPHERICAL UO$sub 4$. United States.
Gregory, J.F. Jr., and Levey, R.P. Jr. 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, J.F. Jr. and Levey, R.P. Jr.},
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 = {1962},
month = {6}
}