Effects of additives on agglomeration and secondary nucleation in seed precipitation in sodium aluminate solution
In order to stabilize the particle size of Al(OH)_3 production in sodium aluminate solution, a systematic study of the effects and mechanism of additives on agglomeration and nucleation in seed precipitation was made. The result indicated that some appropriate additive at certain concentration could significantly decrease the fine particle content, enhance the agglomeration process, and effectively restrain the secondary nucleation process. For instance, additive I_ 33 at 40 ml·L -1 decreased the content of particles less than 30 μm by 26.1% and increases the mean particle size by 21.08 μm. The crystal morphology showed that the additives could accelerate the inter-growth of crystals.