摘 要: 水力溢流分级精度较高，是目前常用的超细颗粒分级方法， 通过溢流分级，可以将研磨后的粉体分级成为某一特定粒度分布的粉 体，以适应研磨抛光等行业对粒度分布的要求。通过水力溢流分级， 研究了分散剂、超声波等因素对超细α-Al2O3 水力分级的影响，结果 表明，分散剂虽然可以消除分级过程中的小颗粒现象，但是也对分级 结果产生负面影响，使分级后的产品粒度分布变宽；加入分散剂，同 时超声处理后样品可以得到较好的分级结果，分级后的粒度分布较窄。
关键词: 水力分级；小颗粒现象；溢流分级；氧化铝
Abstract: Hydraulic overflowing separation is a high degree of accu racy solution of powder gradation .Single-size distribution of powder can be obtained by hydraulic overflowing separation,which can be used on abrading and polishing technology. Hydraulic overflowing separa tion process onα-Al2O3 powder was studied . Some factors of separa tion process influenced the results, such as disperser, supersonic et al. The small particle phenomenon was weaken by disperser, but the size distribution was widen .Co-action of disperser and supersonic not only made mall particle phenomenon weaken, but also led a narrow size distribution.
Keywords: hydraulic separation;small particle phenomenon; hydraulic overflowing separation; alumina
