Compositions: ceramic – Ceramic compositions – Clay containing
Patent
1991-08-01
1993-06-29
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Clay containing
501145, 501147, 106416, C04B 3300, C04B 3302, C04B 3304
Patent
active
052234630
ABSTRACT:
A process for producing a high brightness, high solids kaolin clay aqueous slurry. An aqueous low solids suspension of crude kaolin clay is degritted, and subjected to a particle size classification. The aqueous suspension of the fine particle fraction is acidified to a pH of 5.0 or lower to produce an acid flocculated suspension which is treated with a bleaching agent to reduce ferric ion impurities to ferrous ion impurities. A ferrous ion chelating agent is added to the bleached acid flocculated suspension after which an alkaline agent is added to raise the pH to a level greater than 5.0 to form a dispersed aqueous suspension of the beneficiated kaolin. The dispersed suspension is then subjected to membrane filtration to partially dewater same, and additional water is thermally evaporated from the partially dewatered dispersed kaolin suspension to produce the high solids product suspension.
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International search report in corresponding International Application PCT/US92/06294.
Bilimoria Bomi M.
Thompson William E.
Bell Mark L.
ECC International Inc.
Marcheschi Michael
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