Influence of additives on
physico-chemical properties of sodium aluminate
solution using seed precipitation in the bayer process
Various surfactants were added into the sodium aluminate solution in order
to investigate the influences on the precipitation of aluminum hydroxide.
The results indicate that proper additives such as C, H2, F,
etc., can not only improve the precipitation rate, but also enhance the
particle size as well as the intensity of the aluminum hydroxide products.
The improvement effects of the surfactants in the Bayer process are ascribed
to the modification of the physical-chemistry properties of the sodium
aluminate solutions. Surface tension, viscosity and conductivity of sodium
aluminate solution were studied in detail, and it seems that moderate
decrease of surface tension as well as the decrease of the viscosity is in
favor of the production of aluminum hydroxide with high yield, large
particle size and high intensity.