超微粉体上升层流水力分级实验研究

Experimental Study on Rising Laminar Flow Hydraulic Classification of Ultrafine Powders

以中位粒径d50为1.14μm的β-SiC超微粉体为分级原料,采用自行研发的上升层流水力分级方法进行分级实验研究,以示踪液进行分级管内流态的观察和判别。结果表明,通过调节多孔陶瓷模块结构和水流速度,能获得稳定、均匀的层流力场;在层流状态下,流体速度为2.5、2.0 m/h时,在不同高度的取料口处获得平均粒径分别为0.86、0.75、0.50、0.40μm的分级产物,实现β-SiC超微粉体的精细分级。

Taking β-SIC ultrafine powders with median particle size d50 of 1.14 μm as the classification raw materials, the self-developed rising laminar flow hydraulic classification method was used to carry on experimental study of classification. The tracer liquid was used to observe and judge the flow state. The results show that the stable and uniform flow field can be gotten by adjusting the structure of porous ceramic module and flow velocity. Under the state of laminar, different products with average particle sizes of 0.86, 0.75, 0.50, 0.40 μm are gotten at different heights and the flow rates of 2.5 and 2.0 m/h. The β-SIC ultrafine powders are accurately graded.