Method and system for the measurement of chemical species in...

G - Physics – 01 – N

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G01N 21/35 (2006.01) G01N 21/94 (2006.01)

Patent

CA 2655661

A method and system for measuring the concentration of chemical species, including aluminate, hydroxide, carbonate, sulphate and organics, within a Bayer liquor or similar aluminate containing caustic solutions is described. The method utilises transmission or absorbance in the mid-range infra-red spectrum, particularly using Fourier Transform Infra Red (FTIR) or attenuated total reflectance FTIR (ATR-FTIR). The method shows that in a typical Bayer liquor or caustic aluminate solution, intensities in a number of particular infra-red frequency regions can be correlated with the concentration of one or more important chemical species. This technique advantageously permits sampling and analysis that is rapid and requires small volumes, wherein dilution of the sample may not be required prior to analysis. The method is suitable for application as both an automated high throughput laboratory procedure as well as being adaptable for process monitoring through on-line or side-stream measurement.

L'invention concerne un procédé et système de mesure de la concentration d'espèces chimiques, englobant l'aluminate, l'hydroxyde, le carbonate, le sulfate et les matières organiques, dans une liqueur Bayer ou des solutions similaires caustiques contenant de l'aluminate. Le procédé fait appel à la transmission ou l'absorbance dans le spectre infrarouge moyen, en particulier le spectromètre infrarouge à transformée de Fourier (FTIR) ou le FTIR de réflectance totale atténuée (ATR-FTIR). Le procédé montre que dans une liqueur Bayer ou une solution d'aluminate caustique classique, les intensités dans un certain nombre de régions de fréquence infrarouge particulière peuvent être corrélées avec la concentration d'une ou de plusieurs espèces chimiques importantes. Cette technique permet avantageusement un échantillonnage et une analyse à la fois rapides et au moyen de faibles volumes, la dilution de l'échantillon n'étant pas indispensable avant l'analyse. Le procédé peut s'appliquer comme procédure de laboratoire de rendement élevé automatisée et s'adapter à la surveillance des traitements par des mesures en ligne sur un courant ou un courant latéral.

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