Method for the recovery of alumina
CA 1191665 A · Owner: Alcoa Chemie Gmbh · Inventors: Pohland, Horst; Tielens, Arthur J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved method for recovering coarse-crystalline aluminum oxide from bauxite according to the Bayer method with which in the presence of fine seed crystals in a supersaturated sodium aluminate solution at 80 to 65°C agglomerates are first, of all formed, which are then if necessary while introducing, medium-coarse seed crystals led through a first cascade of, crystallizers and after cooling to 55 to 45°C, through a second crystallizer cascade. The drawn off crystal-suspension is fractionated into fine seed crystals, if necessary also mediumcoarse seed crystals, and coarse product crystals which are ultimately calcined.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted August 13, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 13, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.