Process for the production of aluminium hydroxide of...

C - Chemistry – Metallurgy – 01 – F

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C01F 7/46 (2006.01) C09C 1/40 (2006.01)

Patent

CA 2385320

Aluminium hydroxide of high whiteness is produced by (i) heating aluminium hydroxide obtained from the Bayer process to a temperature of 300 to 700 ~C, (ii) dissolving the soluble fraction of the thus obtained activated product at 85 to 275 ~C in aqueous sodium hydroxide to form a sodium aluminate liquor containing an undissolved residue of very fine boehmite, (iii) filtering said sodium aluminate liquor to obtain a clear solution of sodium aluminate supersaturated with respect to dissolved alumina, (iv) cooling said clear solution to 50 to 80 ~C and seeding with crystallized aluminium hydroxide to induce further crystallization, and (v) separating, washing and drying the produced aluminium hydroxide crystals.

L'invention concerne un procédé de production d'hydroxyde d'aluminium de grande blancheur, qui comporte les étapes consistant à : (1) chauffer de l'hydroxyde d'aluminium obtenu par le procédé de Bayer à une température de 300 à 700 ·C ; (2) dissoudre la fraction soluble du produit activé ainsi obtenu à une température comprise entre 85 et 275 ·C dans de la soude caustique aqueuse pour former une liqueur d'aluminate de sodium contenant un résidu non dissous de boehmite très fine ; (3) filtrer ladite liqueur d'aluminate de sodium pour obtenir une solution transparente d'aluminate de sodium sursaturée par rapport à l'alumine dissoute ; (4) refroidir ladite solution transparente à une température comprise entre 50 et 80 ·C et l'ensemencer à l'aide d'hydroxyde d'aluminium cristallisé pour induire une cristallisation supplémentaire, et (5) séparer, laver et sécher les cristaux d'hydroxyde d'aluminium produits.

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