Heber Edward Rast from Cameron, SC, age 82

Method Of Removing Spectator Ions From Aqueous Suspension Of Solid Particles
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US Patent:

20050095193, May 5, 2005
Filed:

Aug 13, 2004
Appl. No.:

10/917829
Inventors:

James Adair - State College PA, US
Christopher Szepesi - State College PA, US
Heber Rast - The Woodlands TX, US
Mike Chu - Lewiston NY, US
Xiangdong Feng - Broadview Heights OH, US
Assignee:

Ferro Corporation - Cleveland OH
The Penn State Research Foundation - University Park PA
International Classification:

C01G023/00
US Classification:

423598000, 2520623BT
Abstract:

The present invention provides a method of removing spectator ions and contaminants from aqueous suspensions of solid particles. In accordance with the method of the invention, the solid particles are transported across a phase boundary into a non-polar organic solvent, leaving the spectator ions and contaminants in the aqueous phase. To facilitate the efficient transportation of the solid particles across the phase boundary, the surface of the solid particles is coated with an amphiphilic polyelectrolyte. If desired, the solid particles can be recovered from the organic phase by evaporating the organic solvent.