分级旋流器分选作用与分选旋流器分级作用试验研究

为考查颗粒粒度与密度对旋流器分级、分选的影响，采用20°锥角的分级旋流器与130°锥角的分选旋流器对＜3 mm粒级的煤泥进行了分离试验，对其产品进行筛分及分粒级浮沉，得到了不同粒度、密度颗粒在旋流器产品中的分配规律。结果表明：20°锥角旋流器以分级为主，但对各粒级均存在一定的分选作用，其中对＜0.125 mm粒级分选作用最强，这是导致溢流低灰精煤跑粗及底流细泥夹带的根源；130°锥角旋流器以分选为主，对较低密度颗粒不存在分级作用，随密度的增大，分级作用开始显现，对高密度颗粒存在明显的分级作用，这是导致溢流高灰细泥污染的根源。

Experimental study on the separation effect based on density in hydrocyclone and the classification effect based on size in water-only cyclone

In order to study the effect of particle size and density on the classification and separation of cyclones，separation experiments of ＜3 mm coal slimes were carried out on a hydrocyclone with 20° cone and a water-only cyclone with 130° cone.Screen and sink-and-float analysis of each size fraction were conducted and the distribution law of particles with different size and density was obtained.The results show that classification predominates in hydrocyclone with 20° cone，while density-based separation effect does exist in each size fraction，and the density-based separation effect is especially significant for ＜0.125 mm fraction，which is the origin of low ash coarse coal loss into the vortex finder and fine coal slime entrainment in the underflow.Density-based separation predominates in water-only cyclone with 130° cone while significant classification does occur for particles of higher density，which is the origin of high ash contaminate in the vortex finder.This size-based classification does not occur for low density particles，but becomes apparent for higher density.