Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1990-02-28
1991-12-17
Hruskoci, Peter
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210732, 210733, 210734, 210735, 210908, C02F 156
Patent
active
050732722
ABSTRACT:
A dry flocculant powder comprises an inorganic substrate consisting essentially of metal oxide/hydroxide particles having an average particle size of less than about 30 microns, said substrate having a cationic or anionic polyelectrolyte coated onto its outer surface, preferably under other than high shear conditions. A method for coating or adhering polyelectrolytes to the outermost surface of inorganic particles comprises dispersing a polyelectrolyte in a substantially non-aqueous solvent, preferably having a low boiling point and a low to intermediate polarity relative to the polyelectrolyte; adding the inorganic particles to the solvent to form a slurry; mixing the slurry under low to moderate shear conditions; and removing excess solvent from the slurry. There is also disclosed a method for removing clay, clay-like materials, humic acids, yeast, biological cells and/or other cell debris from an aqueous stream through contact with the aforementioned dry flocculant powder.
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Novak, Jr. John W.
O'Neill Gary A.
Aluminum Company of America
Hruskoci Peter
Topolosky Gary P.
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