Image Credits: EXAKT Technologies, Inc. and Munson Machinery Company

Grinding mills and pulverizers transform course materials into finer shards or granules.

How Grinding Mills and Pulverizers Work

Mills and pulverizers move materials through various devices that use pressure and/or blades to grind it. This video illustrates a grinding system.

 

Video Credit: Shanghai Shibang Machinery Co.

Types of Grinding Mills and Pulverizers

There are several types of grinding mills and pulverizers available to industrial buyers. These types include,

  • The tumbling reservoir of a ball, tube, roller, media, or vertical mill uses the impact and friction of the feed material, often supplemented by the action of stone or metal shapes.

Image Credit: Wikipedia

  • Hammer and impactor pulverizers use large hydraulic steel plungers or drop-down arms, either repeatedly or with stead force. Some use cages or chains instead.
  • Ring or disc mills use both inside and outside surfaces of a rotating circle for grinding.

Image Credit: Retsch

  • HPGR (high pressure grinding rollers), roll, or roller mills pulverize material as it moves between two large rollers or a roller and a flat surface. The rolls can be serrated, toothed, or smooth.
  • A granulator, cutting, knife, or shredder pulverizer uses numerous evenly spaced blades to finely mince material. Some devices contain both vertically and horizontally blades, producing a confetti-like output. Wood hogs use blades to produce wood chips.
  • Rotor, pin, or universal mills use high speed and centrifugal force.

Image Credit: Retsch

  • Jet or fluid energy mills project a stream of feed particles against another jet or a chamber wall.
  • Buhrstone or attrition mills rotate a grooved stone or metal plate against a stationary one of similar substance.

Image Credit: McGraw-Hill Science & Technology Encyclopedia

Specifications

Important specifications when selecting grinding mills and pulverizers include,

  • The size of the mill can range from pilot/lab to production, e.g., 3.5 to 1600 cu. ft.
  • Feed size, material, and hardness of feed must be considered.
  • Output size ranges.

Image Source: Bauermeister

  • Mills can handle dry or wet input, or both.
  • Mills operate in batches or continuously.

Features and Applications

Pulverizers crush glass, aluminum, concrete, plastic, coal, rock, resin, tires, waste, and other materials. They are used in the ceramics, chemical/fertilizer, construction, food processing, pharmaceutical, metallurgy, paint/adhesives, pulp/paper, coal, and recycling industries.

References

SBM Grinding Mill

Overview of Munson Size Reduction Equipment

Bauermeister Size Reduction

Videos of Various Mill Systems

What is a Pulverizer?