种分法制备超细氢氧化铝过程控制影响因素研究

Study on the control factors in the process of preparing ultrafine aluminum hydroxide by seed separation

本文介绍了种分法制备超细氢氧化铝的结晶过程,重点研究温度对超细氢氧化铝的分解率和晶格发育的影响,以及不同晶种添加量对分解率和成品粒度的影响,对超细氢氧化铝生产工艺技术、提高产品质量等具有重要的指导意义。通过本试验可以得出:分解温度对分解率和晶格生长的作用是双向的,温度越高,诱导期缩短,但分解率降低;温度越高氢氧化铝的晶格生长越完整。因此,为了兼顾氢氧化铝的分解率、晶格完整性及产品粒度分布,需要精确控制分解温度与晶种添加量。

The crystallization process of ultrafine aluminum hydroxide prepared by seed separation was introduced.The effects of temperature on the decomposition rate and lattice development of ultrafine aluminum hydroxide,and the effect of different seed addition amount on the decomposition rate and the particle size of finished products were emphatically studied,which has important guiding significance for improving the lattice quality and determining the production technology.The experimental results show that decomposition temperature has a bidirectional effect on decomposition rate and lattice growth.An increase in temperature leads to a shorter induction period and reduced the decomposition rate.On the other hand,higher temperature makes the lattice growth of aluminum hydroxide more complete.Therefore,in order to take into account the decomposition rate,lattice growth of aluminum hydroxide,and the final product size distribution,the decomposition temperature and seed addition amount needs to be accurately controlled.