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Title: Method of repressing the precipitation of calcium fluozirconate

Abstract

Boric acid or a borate salt is added to aqueous solutions of fluoride containing radioactive wastes generated during the reprocessing of zirconium alloy nuclear fuels which are to be converted to solid form by calcining in a fluidized bed. The addition of calcium nitrate to the aqueous waste solutions to prevent fluoride volatility during calcination, causes the precipitation of calcium fluozirconate, which tends to form a gel at fluoride concentrations of 3.0 M or greater. The boron containing species introduced into the solution by the addition of the boric acid or borate salt retard the formation of the calcium fluozirconate precipitate and prevent formation of the gel. These boron containing species can be introduced into the solution by the addition of a borate salt but preferably are introduced by the addition of an aqueous solution of boric acid. (Official Gazette)

Inventors:
;
Issue Date:
OSTI Identifier:
4314666
Patent Number(s):
3781217
Assignee:
to United States Atomic Energy Commission
Patent Classifications (CPCs):
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
G - PHYSICS G21 - NUCLEAR PHYSICS G21F - PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT
NSA Number:
NSA-29-029188
Resource Type:
Patent
Resource Relation:
Patent File Date: 1972 Jul 01; Other Information: C01g43/00. Orig. Receipt Date: 30-JUN-74
Country of Publication:
United States
Language:
English
Subject:
N40430* -Chemistry-Radiochemistry & Nuclear Chemistry- Radioactive Waste Treatment; N40450 -Chemistry-Radiochemistry & Nuclear Chemistry-Reactor Fuel Processing; *CALCIUM COMPOUNDS- PRECIPITATION; *RADIOACTIVE WASTE PROCESSING- CALCINATION; *SPENT FUELS- REPROCESSING; *ZIRCONATES- PRECIPITATION; AQUEOUS SOLUTIONS; BORIC ACID; BORON COMPOUNDS; CHEMICAL REACTIONS; GELS; ZIRCONIUM ALLOYS

Citation Formats

Newby, B J, and Rhodes, D W. Method of repressing the precipitation of calcium fluozirconate. United States: N. p., 1973. Web.
Newby, B J, & Rhodes, D W. Method of repressing the precipitation of calcium fluozirconate. United States.
Newby, B J, and Rhodes, D W. Tue . "Method of repressing the precipitation of calcium fluozirconate". United States.
@article{osti_4314666,
title = {Method of repressing the precipitation of calcium fluozirconate},
author = {Newby, B J and Rhodes, D W},
abstractNote = {Boric acid or a borate salt is added to aqueous solutions of fluoride containing radioactive wastes generated during the reprocessing of zirconium alloy nuclear fuels which are to be converted to solid form by calcining in a fluidized bed. The addition of calcium nitrate to the aqueous waste solutions to prevent fluoride volatility during calcination, causes the precipitation of calcium fluozirconate, which tends to form a gel at fluoride concentrations of 3.0 M or greater. The boron containing species introduced into the solution by the addition of the boric acid or borate salt retard the formation of the calcium fluozirconate precipitate and prevent formation of the gel. These boron containing species can be introduced into the solution by the addition of a borate salt but preferably are introduced by the addition of an aqueous solution of boric acid. (Official Gazette)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1973},
month = {12}
}