Methods of Size Reduction

Methods of Size Reduction

• Key methods include Cutting, Compression, Impact, Attrition, and Combined impact and attrition.
• Crushing, Grinding, Pulverizing, Filtration, Distillation, Extraction, Chromatography, Heating, Cooling, Evaporating, and Condensing are not recognized as size reduction methods.

Cutting Method

• Cutting method specifically involves the mechanical division of materials into smaller pieces.

Cutter Mill Principles

• Operates on the principle of cutting, utilizing sharp knives for size reduction.
• Focuses on providing efficient slicing action on the material.

Types of Knives in Cutter Mills

• Comprises stationary knives and rotating knives, aiding in the cutting process.
• Straight knives and serrated knives as well as metal and plastic knives are not typically used.

Roller Mill Construction

• Features two cylindrical rollers, traditionally made of stone, ensuring effective grinding or size reduction.

Roller Mill Principles

• Functions on the principle of compression, applying pressure to reduce material size.
• It does not operate based on impact, attrition, or cutting principles.

Hammer Mill Principles

• Works primarily on the principle of impact, utilizing rapid blows to break materials into smaller sizes.
• Does not utilize cutting or compression methods for size reduction.

Disintegrator Principles

• Reduces size using the principle of impact, ensuring efficient breaking of materials.
• Compression, attrition, or cutting are not involved.

Fluid Energy Mill Construction

• Composed of a loop of pipe with an air or inert gas inlet and nozzles for material feed.
• Does not include configurations like rotating blades, drums, or vibrating screens.

Fluid Energy Mill Principles

• Functions on the combined principles of impact and attrition to break down materials effectively.
• Compression and cutting principles are not applicable in this method.