Selective rheological separation of clays

Details Selective rheological separation of clays Selective rheological separation of clays

1980-12-15

1982-06-15

Halper, Robert

Classifying, separating, and assorting solids

Precedent preparation of items or materials to facilitate...

Selective differentiation

209166, 501148, B03B 100

Patent

active

043349854

ABSTRACT:
A method is disclosed for beneficiating a kaolin clay pigment to improve the rheological properties of a high solids suspension subsequently formed therefrom. According to the method, a 10 to 20% solids aqueous suspension of a kaolin clay is subjected to a selective rheological separation, by mixing the suspension with from about 0.001% to 0.1% by weight of dry clay, of a high molecular weight anionic polymer, and allowing the thereby treated suspension to separate into a sedimented phase, and a supernatant phase which is substantially free of aggregates; and separating the supernatant phase containing the beneficiated kaolin pigment in suspension. The suspended product of the process can then be conventionally processed, as by reductive bleaching, floccing, filtering, washing, dispersing, and drying.

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