High solids processing of kaolinitic clays with post-leaching ox

Details High solids processing of kaolinitic clays with post-leaching ox High solids processing of kaolinitic clays with post-leaching ox

1985-03-29

1986-10-21

Morris, Theodore

Compositions: coating or plastic

Materials or ingredients

106309, 501149, C04B 1400, C04B 3300

Patent

active

046183744

ABSTRACT:
A process for beneficiating a poor grade crude kaloinitic clay mineral to produce a clay filler for use in papermaking to improve the brightness of the paper product. The crude kaolin clay is blunged with water containing a dispersing agent to form a high solids fluid aqueous clay suspension. This clay suspension is then screened and fractionated to reduce the particle size thereof to 92-95% finer than 2 microns. The fractionated clay suspension is treated with an alkaline leaching solution containing a reducing agent effective in converting ferric ions to ferrous ions and, preferably, a water-soluble anionic phosphate. The leached clay suspension, which has a solids content of at least 55%, is then treated with an oxidizing agent to oxidize unreacted leaching agent and byproducts formed during the leaching process.

REFERENCES:
patent: 3489586 (1970-06-01), Chapman et al.
patent: 4002487 (1977-01-01), Conley
patent: 4186027 (1980-01-01), Bell et al.

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