Kaolin clay processing

Details Kaolin clay processing Kaolin clay processing

1979-01-08

1981-01-20

Meros, Edward J.

Compositions: coating or plastic

Materials or ingredients

106 72, C09C 142

Patent

active

042460395

ABSTRACT:
Manufacture of white calcined kaolin clay pigments from dilute dispersed aqueous suspensions of wet-processed hydrated kaolin clay is normally an energy intensive operation because heat and electrical energy are consumed in dewatering the suspensions and additional heat of substantial magnitude is required to calcine the resulting dry dewatered clay material. Energy efficiency is improved by dewatering the dilute aqueous suspension of hydrated kaolin clay in stages to provide dry pulverized calciner feed. An initial portion of the water in the dispersed aqueous suspension is removed in an electrofilter operated to produce a more concentrated but still fluid dispersed suspension of hydrated kaolin. The remainder of the liquid water is then removed from the suspension by spray drying. Preferably the suspension of hydrated kaolin fed to the electrofilter is preheated (and, optionally, some water evaporated) by direct heat exchange with hot exhaust gases from a clay calciner used to remove water of hydration from the kaolin.

REFERENCES:
patent: 3309214 (1967-03-01), Podschus et al.
patent: 3383438 (1968-05-01), Allegrini et al.
patent: 3586523 (1971-06-01), Fanselow et al.
patent: 3798044 (1974-03-01), Whitley et al.
patent: 4003819 (1977-01-01), Kunkle et al.
patent: 4048038 (1977-09-01), Kunkle et al.

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