Title: Process and apparatus for production alumina from decomposition sodium aluminate liquid
Application Number: 87103497 Application Date: 1987.05.14
Publication Number: 1014960 Publication Date: 1987.12.02
Approval Pub. Date: 1991.01.02 Granted Pub. Date: 1991.01.02
International Classifi-cation: C01F7/14
Applicant(s) Name: Aluminium Pechiney Address:
Inventor(s) Name: Chantriaux Eric;Grobelny Henri
Attorney & Agent: CHEN JIZHUANG LUO YINGMING
Abstract:
    A process and an apparatus for the continuous decoposition of a supersaturated sodium aluminate liquor forming a suspension in the presence of aluminium trihydroxide seed characterised by: (a) bringing into contact in a non-agitated grading decomposer a feed flow formed by the suspension and a recycling flow which is taken off in the underflow zone of the decomposer, (b) simultaneously drawing off a production flow in the same underflow zone, (c) extraction of an overflow flow at the overflow of the grading decomposer, and (d) suitable regulation in dependence on the flow rate of the feed flow, the flow rate of the recycling flow, the speed of discharge flow of the suspension in the underflow zone and the speed of rise of the suspension in the overflow zone.
Time: 5
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