Effect of crystal growth modifier on the structure of sodium aluminate liquors analyzed by raman spectroscopy

Abstract

It has been proved that crystal growth modifier (CGM) can improve particle size distribution (PSD) and the alumina production. However, few researches were reported on whether CGM has an effect on the structure of sodium aluminate liquors. In order to provide fundamental guidance to the application of CGM to seed precipitation, the effect of CGM on the structure of synthesized sodium aluminate liquors was studied. It is shown that there is no new characteristic peak and obvious shift in the Raman spectrum of the liquors after adding a certain amount of CGM. By constructing a comparison function and using calculation function of the software of Raman spectrometer, it is found that CGM might have micro effect on the structure of sodium aluminate liquors via changing the concentration of principal ion Al(OH)4-in the liquors.