In the process of seed crystal decomposition of sodium aluminate solution, the strength of aluminum hydroxide can be enhanced by applying an appropriate amount of additives. 1,2-octanediol is one of the commonly used additives, which is widely used due to its unique advantages, such as no need to make large adjustments to the production equipment and processes, simple operation, and obvious strengthening effect.
In the actual study, 1,2-octanediol has a certain influence on the sodium aluminate seeding process. It can clearly consistently decompose the sodium aluminate solution during the 8 hours of seeding. Especially at different caustic concentrations, the additive can significantly inhibit the decomposition of the sodium aluminate solution in the initial stage of the seed.
In the case where the concentration of the additive 1,2-octanediol is low, the decomposition rate generally increases rapidly after 50 hours as the reaction progresses. This may be due to the fact that as the reaction progresses, new active sites are generated due to factors such as agitation, and the sodium aluminate solution decomposes rapidly when the additive is insufficient to cover the entire active site.