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Title: 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:
 [1];  [1];  [1]
  1. 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)
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 = {1997},
month = {1}
}

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