Title:
PROCESS AND APPARATUS FOR THE PRODUCTON OF ALUMINA
Document Type and Number:
WIPO Patent Application WO2005104718
Kind Code:
A3
Abstract:
A process for the production of alumina from aluminum trihydrate in which the trihydrate is dried (2) and pre-heated (4, 9), after which the remaining free and chemically-bonded water is removed when the trihydrate is converted by calcination (12) to form hot calcined alumina which is cooled to about 50 - 100°C in one or more stages (20, 25). In at least one stage the hot calcined alumina is cooled in a countercurrent cyclone (25).
Inventors:
RAAHAUGE BENNY E (DK)
MALEY WILLIAM S (AU)
MALEY WILLIAM S (AU)
Application Number:
PCT/US2005/014148
Publication Date:
August 03, 2006
Filing Date:
April 26, 2005
Export Citation:
Assignee:
FFE MINERALS CORP (US)
ALCOA WORLD ALUMINA LLC (US)
ALCOA WORLD ALUMINA LLC (US)
International Classes:
B01J6/00; B04C1/00; B65G53/16; C01F7/444
Foreign References:
| US4585645A | 1986-04-29 | |||
| US4203689A | 1980-05-20 | |||
| US3265465A | 1966-08-09 |
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