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Title: Extracting metals directly from metal oxides

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:
OSTI Identifier:
870847
Assignee:
Idaho Research Foundation, Inc. (Moscow, ID) CHO
Patent Number(s):
US 5606724
Contract Number:
FG02-91ER75679
Research Org:
University of Idaho
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/