微旋流选择性分离拟薄水铝石胶体粒子的过程及影响

Process and Effects of Centrifugal Classification on Pseudo-boehmite by Mini-hydrocyclone

针对拟薄水铝石合成中反应停留时间不同,晶粒生长、聚集不均匀的问题,设计了直径10 mm的微型水力旋流器,作为粒子分离设备,期望获得性质更稳定、均一的拟薄水铝石。结果表明:采用旋流器分离拟薄水铝石粒子,可以有效地提高粒径集中度,从而提高拟薄水铝石孔径分布的集中度,同时不影响晶相结构和表面性质。多种粒度拟薄水铝石组合可能会形成多峰的孔径分布结构,这一发现有助于优化拟薄水铝石的合成工艺。成胶过程中拟薄水铝石粒子的有效分离和组合,能定向地合成特定孔结构,提高产品性能。

In view of the problem of uneven grain growth and aggregation caused by the different reaction residence time during the synthesis of pseudo-boehmite, a micro-hydrocyclone with a diameter of 10 mm was designed as a particle separation device. Through the separation, a more stable and uniform pseudo-boehmite could be obtained. The results showed that the separation of pseudo-boehmite particles could obtain pseudo-boehmite with monodispersed particle size and concentrated pore distribution. At the same time, the crystal structure and surface properties of pseudo-boehmite were not affected. The combination of various particle sizes pseudo-boehmite could form a multimodal structure of pore size distribution. This conclusion is beneficial for optimizing the synthetic process of pseudo-boehmite. The effective separation and combination of pseudo-boehmite particles in the gel formation process can be used to synthesize pseudo-boehmite materials with specific pore structure in a directional manner. The performance of pseudo-boehmite will be improved.