STABILITY OF SUPERSATURATED SILICA IN SODIUM ALUMINATE SOLUTION
The relationship of the stability period of supersaturated silica with temperature,alumina concentration,alkali concentration and supersaturation was obtained under the hydrolysis condition. Furthermore,according to the kinetics theory of crystallized nucleation,the equation to calculate the supersolubility of silica in sodium aluminate solution was deduced as well,which correlated the supersolubility of silica with the stability period of supersaturated solute in solution.The mechanism of nucleation was also investigated through classical nucleation theory. Under the hydrolysis condition in alumina production,the nucleation mechanism was mainly heterogeneous.