Extracting metals directly from metal oxides
Abstract
A method of extracting metals directly from metal oxides by exposing the oxide to a supercritical fluid solvent containing a chelating agent is described. Preferably, the metal is an actinide or a lanthanide. More preferably, the metal is uranium, thorium or plutonium. The chelating agent forms chelates that are soluble in the supercritical fluid, thereby allowing direct removal of the metal from the metal oxide. In preferred embodiments, the extraction solvent is supercritical carbon dioxide and the chelating agent is selected from the group consisting of .beta.-diketones, halogenated .beta.-diketones, phosphinic acids, halogenated phosphinic acids, carboxylic acids, halogenated carboxylic acids, and mixtures thereof. In especially preferred embodiments, at least one of the chelating agents is fluorinated. The method provides an environmentally benign process for removing metals from metal oxides without using acids or biologically harmful solvents. The chelate and supercritical fluid can be regenerated, and the metal recovered, to provide an economic, efficient process.
- Inventors:
-
- Moscow, ID
- Issue Date:
- Research Org.:
- Univ. of Iowa, Iowa City, IA (United States)
- OSTI Identifier:
- 870847
- Patent Number(s):
- 5606724
- Assignee:
- Idaho Research Foundation, Inc. (Moscow, ID)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02P - CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- DOE Contract Number:
- FG02-91ER75679
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- extracting; metals; directly; metal; oxides; method; exposing; oxide; supercritical; fluid; solvent; containing; chelating; agent; described; preferably; actinide; lanthanide; uranium; thorium; plutonium; forms; chelates; soluble; allowing; direct; removal; preferred; embodiments; extraction; carbon; dioxide; selected; consisting; beta; -diketones; halogenated; phosphinic; acids; carboxylic; mixtures; especially; agents; fluorinated; provides; environmentally; benign; process; removing; biologically; harmful; solvents; chelate; regenerated; recovered; provide; economic; efficient; removing metals; removing metal; benign process; agent forms; extracting metal; biologically harmful; forms chelates; especially preferred; supercritical carbon; solvent containing; environmentally benign; extraction solvent; preferred embodiments; supercritical fluid; carbon dioxide; metal oxide; preferred embodiment; chelating agents; chelating agent; metal oxides; carboxylic acids; carboxylic acid; method provides; efficient process; fluid solvent; method provide; moving metal; harmful solvents; metals directly; extracting metals; phosphinic acid; /423/
Citation Formats
Wai, Chien M, Smart, Neil G, and Phelps, Cindy. Extracting metals directly from metal oxides. United States: N. p., 1997.
Web.
Wai, Chien M, Smart, Neil G, & Phelps, Cindy. Extracting metals directly from metal oxides. United States.
Wai, Chien M, Smart, Neil G, and Phelps, Cindy. Wed .
"Extracting metals directly from metal oxides". United States. https://www.osti.gov/servlets/purl/870847.
@article{osti_870847,
title = {Extracting metals directly from metal oxides},
author = {Wai, Chien M and Smart, Neil G and Phelps, Cindy},
abstractNote = {A method of extracting metals directly from metal oxides by exposing the oxide to a supercritical fluid solvent containing a chelating agent is described. Preferably, the metal is an actinide or a lanthanide. More preferably, the metal is uranium, thorium or plutonium. The chelating agent forms chelates that are soluble in the supercritical fluid, thereby allowing direct removal of the metal from the metal oxide. In preferred embodiments, the extraction solvent is supercritical carbon dioxide and the chelating agent is selected from the group consisting of .beta.-diketones, halogenated .beta.-diketones, phosphinic acids, halogenated phosphinic acids, carboxylic acids, halogenated carboxylic acids, and mixtures thereof. In especially preferred embodiments, at least one of the chelating agents is fluorinated. The method provides an environmentally benign process for removing metals from metal oxides without using acids or biologically harmful solvents. The chelate and supercritical fluid can be regenerated, and the metal recovered, to provide an economic, efficient process.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1997},
month = {Wed Jan 01 00:00:00 EST 1997}
}
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Works referenced in this record:
Solvent extraction of dithiocarbamate complexes and back-extraction with mercury(II) for determination of trace metals in seawater by atomic absorption spectrometry
journal, December 1982
- Lo, J. M.; Yu, J. C.; Hutchison, F. I.
- Analytical Chemistry, Vol. 54, Issue 14
Supercritical fluid extraction of lanthanides and actinides from solid materials with a fluorinated .beta.-diketone
journal, September 1993
- Lin, Yuehe.; Brauer, R. D.; Laintz, K. E.
- Analytical Chemistry, Vol. 65, Issue 18
Supercritical fluids offer improved separations: Gases at high pressure and above critical temperature separate compounds under mild conditions, require less energy but more capital
journal, August 1981
- Worthy, Ward
- Chemical & Engineering News, Vol. 59, Issue 31
Enhanced extraction of lanthanides with crown ether carboxylic acids of increasing lipophilicity
journal, January 1989
- Tang, Jian; Wai, Chien M.
- The Analyst, Vol. 114, Issue 4
Zum Stand der Extraktion mit komprimierten Gasen
journal, January 1981
- Brunner, Gerd; Peter, Siegfried
- Chemie Ingenieur Technik, Vol. 53, Issue 7
Extraktion mit überkritischen Gasen — ein Vorwort
journal, October 1978
- Wilke, Günther
- Angewandte Chemie, Vol. 90, Issue 10