Production of alumina trihydrate with separate control of...

C - Chemistry – Metallurgy – 01 – F

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C01F 7/14 (2006.01) C01F 7/02 (2006.01)

Patent

CA 2310128

The invention concerns a method for producing alumina trihydrate by decomposing in the presence of an supersaturated sodium aluminate liquor (1) derived from a BAYER process chain characterised in that it consists in applying at the beginning of the decomposition (A) an intense mechanical action in the supersaturated aluminate suspension (3). The mechanical action is carried out at the start of decomposition, for example in the priming tank (A) or in one or several circuit(s) recirculating the supersaturated aluminate suspension (3) above the priming vessel. The mechanical action is carried out by grinding, by transmitting high power ultrasounds, by a shearing turbine or by an additional centrifugal pump (P) recirculating with high flow rate the aliquot above an auxiliary tank. When an auxiliary tank is used, a supersaturated aluminate liquor is advantageously mixed with the suspension to be treated. The method is also applicable to American type decomposition chains.

Procédé de fabrication de trihydrate d'alumine par décomposition en présence d'amorces d'une liqueur sursaturée (1) d'aluminate de sodium issu d'une chaîne du procédé BAYER caractérisé en ce qu'on applique en début de décomposition (A) une action mécanique intense dans la suspension d'aluminate sursaturée (3). L'action mécanique est effectuée en tête de décomposition, par exemple dans le bac d'amorce (A) ou dans un ou plusieurs circuit(s) mettant en recirculation la suspension d'aluminate sursaturée (3) sur le bac d'amorce. L'action mécanique est effectuée par broyage, par transmission d'ultrasons de haute puissance, par une turbine cisaillante ou encore avec une pompe centrifuge (P) supplémentaire faisant recirculer à fort débit l'aliquote sur un bac auxiliaire. Lorsqu'un bac auxiliaire est employé, on y mélange avantageusement une liqueur d'aluminate sursaturé en alumine avec la suspension à traiter. Le procédé est également applicable aux chaînes de décomposition de type américain.

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