| 摘要 |
<p>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.</p> |
