Brightness, reduced impurity clays and methods of making same

Details Brightness, reduced impurity clays and methods of making same Brightness, reduced impurity clays and methods of making same

1997-05-09

1999-12-28

Nguyen, Tuan N.

Classifying, separating, and assorting solids

Precedent preparation of items or materials to facilitate...

Selective differentiation

209 5, 209214, 209232, 106486, 501146, B03C 100, B03B 104

Patent

active

060069201

ABSTRACT:
Provided is a method of making improved brightness kaolin clay from an aqueous kaolin clay slurry in which the primary active dispersant is a weak dispersant, at least including the steps of adding to the kaolin clay an effective magnet enhancer reagent wherein the magnet enhancer reagent comprises an aqueous solution of one or more magnetic oxides and one or more surface active agents; conditioning the kaolin clay; and performing high gradient magnetic separation on the conditioned kaolin clay to produce an improved brightness kaolin clay. The method is also applied to decreasing iron- and/or titania-containing impurities in a clay.

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patent: 4834898 (1989-05-01), Hwang
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patent: 5332493 (1994-07-01), Ginn et al.
patent: 5527426 (1996-06-01), Marwah et al.
NALCO Material Safety Data Sheet for NALCO 9868; Feb. 10, 1997.

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