Method for extracting metals from aqueous waste streams for long

Details Method for extracting metals from aqueous waste streams for long Method for extracting metals from aqueous waste streams for long

1993-07-29

1995-03-07

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210639, B01D 1104

Patent

active

053955323

ABSTRACT:
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.

REFERENCES:
patent: 4548790 (1985-10-01), Horwitz et al.
patent: 4574072 (1986-03-01), Horwitz et al.
patent: 5269975 (1993-12-01), Noakes
D. J. Chaiko, "Partitioning of Polymeric Plutonium (IV) in Winsor II Microemulsion Systems", Separation Science and Technology, 27(11), pp. 1389-1405, 1992.

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