Coal breaking (also known as coal crushing or coal sizing) involves reducing large chunks of coal into smaller, more manageable pieces for transportation, combustion, or processing. Here are the key types of equipment used for coal breaking:
1. Primary Crushers
– Jaw Crusher: Uses compressive force to break large coal lumps into smaller fragments. Suitable for high-capacity primary crushing.
– Gyratory Crusher: Handles large feed sizes and provides continuous crushing action, ideal for high-throughput mining operations.
– Rotary Breaker (Bradford Breaker): A rotating drum with perforations that breaks coal by tumbling it against itself while removing impurities like rock.
2. Secondary Crushers
– Roll Crusher: Uses two counter-rotating rollers to crush coal into a uniform size. Works well for medium-hard to hard coals.
– Impact Crusher (Hammer Mill): Uses high-speed impact forces from hammers or blow bars to shatter coal into smaller pieces. Good for softer coals.
– Cone Crusher: Provides finer crushing than primary crushers and is used when a more uniform product size is needed.
3. Tertiary & Fine Crushing
– Vertical Shaft Impactors (VSI): Used for very fine coal crushing, producing cubical-shaped particles.
– Ball Mill / Rod Mill: Used in pulverizing coal for combustion (e.g., in power plants).
4. Screening & Sizing Equipment
– Vibrating Screens: Separate crushed coal into different size fractions.
– Trommel Screens: Rotating cylindrical screens used in some coal preparation plants.
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5. Specialized Coal Breaking Machines
– Feeder-Breakers: Combine feeding and primary crushing in underground mining operations.
– Sizers (MMD Sizers): Low-profile machines that efficiently crush coal with minimal fines generation.
Selection Factors
– Coal hardness & abrasiveness
– Desired output size
– Capacity requirements
– Moisture content
– Presence of impurities (rock, shale)
Would you like recommendations based on a specific application (e.g., power plants, coking coal, mining)?