Method for purifying sodium aluminate liquors containing...

C - Chemistry – Metallurgy – 01 – F

Patent

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C01F 7/06 (2006.01) C01F 7/47 (2006.01)

Patent

CA 2350686

The invention concerns a method for removing sodium oxalate from the aluminate liquor from the Bayer process derived from the caustic attack of bauxite slightly loaded with organic matter (typically generating less than 400 grams of oxalic carbon per ton of alumina produced). Said method consists in treating a rather low proportion of non-concentrated spent aluminate liquor (typically 10 to 30%), by causing it to follow a circuit passing though a series of decomposition vessels-called cold mini-series- at low temperature around 40 ·C, the oxalate precipitating on part of the hydrate produced which is then recuperated after washing, in a slightly greater amount than the sampled amount. The capacity of the suspension from the cold mini-series of being filtered is remarkably enhanced by the input of an additive usually designed to promote agglomeration of fines during decomposition.

Procédé de désoxalatation de la liqueur d'aluminate d'un circuit Bayer provenant de l'attaque caustique de bauxites peu chargées en matières organiques (générant typiquement moins de 400 grammes de carbone oxalique par tonne d'alumine produite) consistant à traiter une proportion assez faible de la liqueur d'aluminate appauvrie non concentrée (typiquement 10 à 30 %), en lui faisant suivre un circuit passant par une série de bacs décomposeurs - appelée mini-série froide - à une température basse, voisine de 40~C, l'oxalate précipitant sur une partie de l'hydrate produit qui est ensuite récupéré après lavage, en une quantité légèrement supérieure à la quantité prélevée. La filtrabilité de la suspension de la mini-série froide est notablement améliorée grâce à l'ajout d'un additif destiné habituellement à favoriser l'agglomération des fines au cours de la décomposition.

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