Removal of sodium oxalate from a bayer liquor

Details Removal of sodium oxalate from a bayer liquor Removal of sodium oxalate from a bayer liquor

C - Chemistry, Metallurgy

01

F

C01F 7/47 (2006.01) B01J 19/10 (2006.01)

Patent

CA 2556665

The Bayer process uses hot sodium hydroxide solution to obtain pure alumina from bauxite ore. Alumina dissolves, and is then precipitated, and the remaining caustic Bayer liquor can be recycled for use again. However sodium oxalate tends to build up in the recycled liquor, and causes problems. By removing a stream of the liquor, treating it so as to be supersaturated with sodium oxalate, and then subjecting it to ultrasonic irradiation, crystal nuclei are formed. The resultant crystals can then be separated from the liquor. Surprisingly, other organic compounds in solution do not prevent this crystallisation process from being effective.

Le procédé Bayer utilise une solution d'hydroxyde de sodium chaude pour obtenir de l'alumine pure à partir de minerai de bauxite. L'alumine se dissout, puis précipite et le reste de la liqueur Bayer corrosive peut être recyclé pour être réutilisé. Toutefois, l'oxalate de sodium à tendance à s'accumuler dans la liqueur recyclée et à entraîner des problèmes. En retirant un circuit de la liqueur, en traitant ce circuit de façon qu'il soit sursaturé avec de l'oxalate de sodium, puis en soumettant le circuit à des ondes ultrasonores, on obtient des cristaux primaires. Ces cristaux peuvent ensuite être retirés de la liqueur. Etonnamment, d'autres composés organiques dans la solution n'empêchent pas ce processus de cristallisation d'être efficace.

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