Size Reduction

Flashcards covering key terms and definitions related to particle size reduction and its principles.

Comminution

The process of breaking down solid materials into smaller particles.

Energy Inefficiency

The degree to which energy consumption in size reduction is inefficient, often below 1% in industrial processes.

Particle Fracture Mechanisms

Various mechanisms that describe how particles break during size reduction.

Rittinger’s Law

The law stating that the energy required for size reduction is directly proportional to the area of new surface created.

Kick’s Law

The law that states the energy required in a comminution process is directly proportional to the volume ratio of the feed particle to the product particle.

Bond’s Law

The law indicating that the work required to reduce particle size is proportional to the inverse square root of the size.

Strain Energy

The stored energy when an object is deformed under stress.

Yield Stress

The maximum stress that a material can withstand without permanent deformation.

Toughness

The ability of a material to absorb energy and plastically deform without fracturing.

Cohesivity

The property of particles to stick together, which can be affected by moisture content.

Attrition

A size reduction method that uses rubbing or scraping to break down materials.

Impact

Breaking down material into smaller particles through forceful strikes against a surface.

Compression

A size reduction technique that uses force to crush materials between surfaces.

Open Circuit Milling

A milling system where material passes only once through the mill without recycling.

Closed Circuit Milling

A milling system involving classification where oversize particles are returned to the mill.

Mechanical Grinding

A method for size reduction involving the abrasion between surfaces.

Jaw Crusher

A machine used for coarse size reduction that compresses materials between two plates.

Ball Mill

A cylindrical device used for fine grinding, where balls move and grind the material.