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Title: RECOVERY OF THORIUM AND URANIUM VALUES FROM AQUEOUS SOLUTIONS

Abstract

This patent deals with the separation and recovery of uranium from monazite sand. After initial treatment of the sand with sodium hydroxide, a precipitate is obtuined which contains the uranium, thorium, rare earths and some phosphorus. This precipitate is then dissolved in nitric acid. The bulk of the rare earths are removed from thls soiution by adding aa excess of alkali carbonate, causing precipitation of the rare earths together with part of the thorium present. The solution still contains a considerable amount of thorium, some rare earths, and practically all of the uranium originally present. Thorium and rare earth values are readily precipitated from such solution, and the uranium values thus isolated, by the addition of an excess hydrogen peroxide. The pH value of the solution is preferably adjusted to at least 9 prior to the addition of the peroxide.

Inventors:
Issue Date:
OSTI Identifier:
4307612
Patent Number(s):
2823976
Assignee:
U.S. Atomic Energy Commission
Patent Classifications (CPCs):
C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01F - COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
NSA Number:
NSA-12-010242
Resource Type:
Patent
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-58
Country of Publication:
United States
Language:
English
Subject:
PATENTS; ALKALI METALS; CARBONATES; HYDROGEN PEROXIDES; MONAZITES; NITRIC ACID; PATENT; PHOSPHORUS; PRECIPITATION; RARE EARTHS; RECOVERY; SEPARATION PROCESSES; SODIUM HYDROXIDES; SOLUTIONS; THORIUM; URANIUM; WATER

Citation Formats

Calkins, G D. RECOVERY OF THORIUM AND URANIUM VALUES FROM AQUEOUS SOLUTIONS. United States: N. p., 1958. Web.
Calkins, G D. RECOVERY OF THORIUM AND URANIUM VALUES FROM AQUEOUS SOLUTIONS. United States.
Calkins, G D. Tue . "RECOVERY OF THORIUM AND URANIUM VALUES FROM AQUEOUS SOLUTIONS". United States.
@article{osti_4307612,
title = {RECOVERY OF THORIUM AND URANIUM VALUES FROM AQUEOUS SOLUTIONS},
author = {Calkins, G D},
abstractNote = {This patent deals with the separation and recovery of uranium from monazite sand. After initial treatment of the sand with sodium hydroxide, a precipitate is obtuined which contains the uranium, thorium, rare earths and some phosphorus. This precipitate is then dissolved in nitric acid. The bulk of the rare earths are removed from thls soiution by adding aa excess of alkali carbonate, causing precipitation of the rare earths together with part of the thorium present. The solution still contains a considerable amount of thorium, some rare earths, and practically all of the uranium originally present. Thorium and rare earth values are readily precipitated from such solution, and the uranium values thus isolated, by the addition of an excess hydrogen peroxide. The pH value of the solution is preferably adjusted to at least 9 prior to the addition of the peroxide.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1958},
month = {2}
}