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Title: Method for extracting metals from aqueous waste streams for long term storage

A liquid-liquid extraction method for removing metals and hydrous metal colloids from waste streams is provided wherein said waste streams are contacted with a solvent system containing a water-in-oil microemulsion wherein the inverted micelles contain the extracted metal. A silicon alkoxide, either alone or in combination with other metal alkoxide compounds is added to the water-in-oil microemulsion, thereby allowing encapsulation of the extracted metal within a silicon oxide network. Lastly, the now-encapsulated metal is precipitated from the water-in-oil microemulsion phase to yield aggregates of metal-silicate particles having average individual particle sizes of approximately 40 nanometers. 2 figs.
Inventors:
Issue Date:
OSTI Identifier:
27699
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; SCA: 320305; 540220; PA: EDB-95:057286; SN: 95001354439
Patent Number(s):
US 5,395,532/A/
Application Number:
PAN: 8-098,920
Contract Number:
W-31109-ENG-38
Resource Relation:
Other Information: PBD: 7 Mar 1995
Research Org:
Univ. of Chicago, IL (United States)
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 54 ENVIRONMENTAL SCIENCES; METALS; SOLVENT EXTRACTION; ENCAPSULATION; PRECIPITATION; LIQUID WASTES; WASTE PROCESSING; REMOVAL; MICROEMULSIONS; ALKOXIDES; SILICON COMPOUNDS