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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.
  1. (Woodridge, IL)
Issue Date:
OSTI Identifier:
United States of America as represented by United States (Washington, DC) ANL
Patent Number(s):
US 5395532
Contract Number:
Research Org:
Argonne National Laboratory (ANL), Argonne, IL
Country of Publication:
United States
method; extracting; metals; aqueous; waste; streams; term; storage; liquid-liquid; extraction; removing; hydrous; metal; colloids; provided; contacted; solvent; containing; water-in-oil; microemulsion; inverted; micelles; contain; extracted; silicon; alkoxide; combination; compounds; added; allowing; encapsulation; oxide; network; lastly; now-encapsulated; precipitated; phase; yield; aggregates; metal-silicate; particles; average; individual; particle; sizes; approximately; 40; nanometers; removing metals; removing metal; term storage; extracting metal; individual particle; metal alkoxide; waste stream; particle size; silicon oxide; waste streams; hydrous metal; particle sizes; aqueous waste; moving metal; alkoxide compound; oxide compounds; extraction method; liquid extract; metal colloids; extracting metals; emulsion phase; liquid extraction; alkoxide compounds; /210/