Classification is to separate the materials into different grade based on the material sedimentation velocity in the medium (water or air).
Following table is the difference between sieving and classification:
|Type||Working Principle||Products Characteristic||Working Efficiency||Applied Material|
|Sieving||Strictly according to the particle size||With even particle size and same average diameter in sibling products||With low working efficiency for fine particle size||>2-3 mm|
|Classification||According to the sedimentation velocity, density would affect the classification work||It is mainly equal setting particle in sibling products. The average diameter of large density particle is smaller than that of small density particle||The working efficiency is higher than that of sieving method.||>2-3mm|