Size reduction equipment colloid

Fig. 1 The four basic types of size reduction equipment used to produce fine solid particles (A) crushers and shredders (B) hammermills (C) colloid mills and (D) fluid energy mills.

Introduction and classification. Size-reduction equipment may be classified according to the way the forces are applied as follows between two surfaces, as in crushing and shearing at one solid surface, as in impact and by action of the surrounding medium, as in a colloid mill. A more practical classification is to divide the equipment into crushers, grinders, fine grinders, and cutters. 

Two classes of grinding equipment are used to prepare dispersions. The first, the colloid mill, does not effect a particle size reduction but does break down aggregates of fine particles. Colloid mills are used for such powders as clays, precipitated whiting, etc. Sometimes these mills are used to process zinc oxide but for dipped mbber products that is not satisfactory. 

---