Precipitation of gibbsite from a bayer liquor

Details Precipitation of gibbsite from a bayer liquor Precipitation of gibbsite from a bayer liquor

C - Chemistry, Metallurgy

01

F

C01F 7/14 (2006.01)

Patent

CA 2570223

A Bayer liquor is produced by dissolving bauxite in hot caustic soda. The liquor is cooled so that it is supersaturated, and seed crystals of gibbsite are added to the liquor (16). At the same time at least part of the liquor is subjected to intense ultrasonic irradiation (34) such as to cause cavitation, preferably by passing liquor and seed crystals (28) through a recirculation duct (30). The ultrasound increases the proportion of fines by breaking up any crystal agglomerates and also by generating crystal nuclei, and also removes fouling from crystal surfaces. The precipitation process is consequently more effective. If ultrasound is applied when measurements indicate that there are insufficient fines in the liquor, this improves the consistency of the precipitation process.

On fabrique une liqueur Bayer par la dissolution de la bauxite dans l'hydroxyde de sodium chaud. La liqueur est refroidie de manière à devenir supersaturée, et des cristaux germes de gibbsite sont ajoutés à la liqueur (16). Simultanément, au moins une partie de la liqueur est soumise à une irradiation ultrasonique intense (34) qui provoque une cavitation; elle s'effectue de préférence lors du passage de la liqueur et des cristaux germes (28) via une conduite de recirculation (30). L'ultrason augmente la proportion des fines grâce à la destruction de n'importe quels agglomérats de cristaux et à la génération de noyaux de cristaux; il évacue également les salissures des surfaces des cristaux. Par conséquent, le processus de précipitation est plus efficace. Si les ultrasons sont appliqués lorsque les mesures indiquent que les fines dans la liqueur sont insuffisantes, cela améliore la consistance du processus de précipitation.

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