Imerys Pigments, Inc.

William Limousin

Robert J Pruett

Jun Yuan

Ismail Yildirim

Jim Richardson

A method of treating a kaolin particulate material to improve one or more of its properties by removal of impurity particles therein which includes: producing a dispersed aqueous suspension of a kaolin particulate material containing at least 0.1% by weight, based on the dry weight of the kaolin particulate material of separable particulate impurity; diluting said dispersed aqueous suspension by adding a diluent thereto; adding a selective flocculation polymer to the diluted suspension; allowing the suspension containing the polymer to separate in a selective flocculation separator into layers comprising a flocculated product layer and a deflocculated impurity layer containing the separable impurity; and extracting the separated layers from the separator, wherein at least a portion of said deflocculated impurity layer is recirculated for use as at least a portion of the aforementioned diluent.

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Larmor Plage France, France

William Limousin