PROCESSING OF MONAZITE SAND
Abstract
A process for the recovery of thorium, uranium, and rare earths from monazite sands is presented. The sands are first digested and dissolved in concentrated NaOH, and the solution is then diluted causing precipitation of uranium, thorium and rare earth hydroxides. The precipitate is collected and dissolved in HCl, and the pH of this solution is adjusted to about 6, precipitating the hydroxides of thorium and uranium but leaving the rare earths in solution. The rare earths are then separated from the solution by precipitation at a still higher pH. The thorium and uranium containing precipitate is redissolved in HNO/sub 3/ and the two elements are separated by extraction into tributyl phosphate and back extraction with a weakly acidic solution to remove the thorium.
- Inventors:
- Issue Date:
- Research Org.:
- Originating Research Org. not identified
- OSTI Identifier:
- 4329541
- Patent Number(s):
- 2815264
- Assignee:
- U.S. Atomic Energy Commission
- Patent Classifications (CPCs):
-
C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS
- NSA Number:
- NSA-12-006990
- Resource Type:
- Patent
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-58
- Country of Publication:
- United States
- Language:
- English
- Subject:
- PATENTS; ACIDS; BUTYL PHOSPHATES; HYDROCHLORIC ACID; HYDROXIDES; MONAZITES; PATENT; PRECIPITATION; RARE EARTHS; RECOVERY; SAND; SODIUM HYDROXIDES; SOLUTIONS; SOLVENT EXTRACTION; THORIUM; THORIUM HYDROXIDES; URANIUM; URANIUM HYDROXIDES
Citation Formats
Calkins, G D, and Bohlmann, E G. PROCESSING OF MONAZITE SAND. United States: N. p., 1957.
Web.
Calkins, G D, & Bohlmann, E G. PROCESSING OF MONAZITE SAND. United States.
Calkins, G D, and Bohlmann, E G. Sun .
"PROCESSING OF MONAZITE SAND". United States.
@article{osti_4329541,
title = {PROCESSING OF MONAZITE SAND},
author = {Calkins, G D and Bohlmann, E G},
abstractNote = {A process for the recovery of thorium, uranium, and rare earths from monazite sands is presented. The sands are first digested and dissolved in concentrated NaOH, and the solution is then diluted causing precipitation of uranium, thorium and rare earth hydroxides. The precipitate is collected and dissolved in HCl, and the pH of this solution is adjusted to about 6, precipitating the hydroxides of thorium and uranium but leaving the rare earths in solution. The rare earths are then separated from the solution by precipitation at a still higher pH. The thorium and uranium containing precipitate is redissolved in HNO/sub 3/ and the two elements are separated by extraction into tributyl phosphate and back extraction with a weakly acidic solution to remove the thorium.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Dec 01 00:00:00 EST 1957},
month = {Sun Dec 01 00:00:00 EST 1957}
}