The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 05, 2010
Filed:
Sep. 19, 2005
Jean-marc Rousseaux, Aix-en-Provence, FR;
Gerard Pignol, Gardanne, FR;
Yves Magnan, Simiana Collongue, FR;
Jean-Marc Rousseaux, Aix-en-Provence, FR;
Gerard Pignol, Gardanne, FR;
Yves Magnan, Simiana Collongue, FR;
Aluminium Pechiney, Voreppe, FR;
Abstract
A process for the production of alumina trihydrate by alkaline digestion of bauxite using the Bayer process in which aluminate liquor and insoluble residues are separated using a solid/liquid separation device (E; W; DC) characterised in that the said slurry (') is at least partially passed through a hydrocyclone (H; H; H; H) to improve and accelerate the separation of the sodium aluminate liquor from the insoluble residues in the slurry (′) containing the said liquor and the said residues and that supplies or is derived from the said liquid-solid separation device. In a first embodiment, at least one hydrocyclone is used at the upstream side of the settler-thickener, as clarifier of the pregnant liquor. In a second embodiment, at least one hydrocyclone is used as a thickener of insoluble residue mud. In a third embodiment, a hydrocyclone is used in combination with the causticisation settler.