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Title: RECOVERY OF URANIUM AND THORIUM FROM AQUEOUS SOLUTIONS

Abstract

>A process is described for the recovery of uranium and thorium from monazite sand, which is frequently processed by treating it with a hot sodium hydroxide solution whereby a precipitate forms consisting mainly of oxides or hydroxides of the rare earths, thorium and uranium. The precipitate is dissolved in mineral acid, and the acid solution is then neutralized to a pH value of between 5.2 and 6.2 whereby both the uranium and thorium precipitate as the hydroxides, while substantially all the rare earth metal values present remain in the solution. The uranium and thoriunn can then be separated by dissolving the precipitate in a solution containing a mixture of alkali carbonate and alkali bicarbonate: and contacting the carbonate solution with a strong-base anion exchange resin whereby the uranium values are adsorbed on the resin while the thorium remains in solution.

Inventors:
Issue Date:
OSTI Identifier:
4330440
Patent Number(s):
2838370
Assignee:
U.S. Atomic Energy Commission
Patent Classifications (CPCs):
C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
NSA Number:
NSA-12-014414
Resource Type:
Patent
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-58
Country of Publication:
United States
Language:
English
Subject:
PATENTS; ABSORPTION; ALKALI METALS; ANIONS; CARBONATES; HYDROXIDES; ION EXCHANGE MATERIALS; MONAZITES; OXIDES; PATENT; PRECIPITATION; RARE EARTHS; RECOVERY; RESINS; SAND; SODIUM HYDROXIDES; SOLUTIONS; THORIUM; THORIUM HYDROXIDES; THORIUM OXIDES; URANIUM; URANIUM HYDROXIDES; URANIUM OXIDES; WATER

Citation Formats

Calkins, G D. RECOVERY OF URANIUM AND THORIUM FROM AQUEOUS SOLUTIONS. United States: N. p., 1958. Web.
Calkins, G D. RECOVERY OF URANIUM AND THORIUM FROM AQUEOUS SOLUTIONS. United States.
Calkins, G D. Tue . "RECOVERY OF URANIUM AND THORIUM FROM AQUEOUS SOLUTIONS". United States.
@article{osti_4330440,
title = {RECOVERY OF URANIUM AND THORIUM FROM AQUEOUS SOLUTIONS},
author = {Calkins, G D},
abstractNote = {>A process is described for the recovery of uranium and thorium from monazite sand, which is frequently processed by treating it with a hot sodium hydroxide solution whereby a precipitate forms consisting mainly of oxides or hydroxides of the rare earths, thorium and uranium. The precipitate is dissolved in mineral acid, and the acid solution is then neutralized to a pH value of between 5.2 and 6.2 whereby both the uranium and thorium precipitate as the hydroxides, while substantially all the rare earth metal values present remain in the solution. The uranium and thoriunn can then be separated by dissolving the precipitate in a solution containing a mixture of alkali carbonate and alkali bicarbonate: and contacting the carbonate solution with a strong-base anion exchange resin whereby the uranium values are adsorbed on the resin while the thorium remains in solution.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1958},
month = {6}
}