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Mechanism: Uses a fixed "jaw" and a moving jaw to compress materials between them, breaking them by squeezing.
Product Shape:
Generally angular with rough, irregular edges.
Tends to produce a mix of particle sizes, including some larger, blocky fragments.
Less prone to flakiness compared to other crushers but not highly uniform.
Example Applications: Primary crushing of hard rocks (e.g., granite) for construction aggregates.
Mechanism: Similar to jaw crushers but uses a rotating cone within a fixed concave chamber, applying high compression to materials.
Product Shape:
More cubical and uniform than jaw crushers.
Angularity is reduced but still present, with fewer elongated or flaky particles.
Produces finer, more consistent gradations (good for secondary/tertiary crushing).
Example Applications: Secondary crushing for high-quality concrete aggregates or asphalt.
Mechanism: Uses rapidly rotating impellers to hurl materials against stationary anvils, breaking them via impact and rebound.
Product Shape:
Highly angular with sharp edges due to the sudden, forceful collision.
Tends to produce smaller, more uniform particles (good for fine crushing).
May generate some flaky particles if the material is brittle (e.g., limestone).
Example Applications: Crushing limestone, recycled concrete, or asphalt for road base.
Mechanism: Materials are accelerated by a rotating rotor and crushed by impact against a "crushing chamber" liner or other particles (autogenous crushing).
Product Shape:
Round, cubical, and well-graded—among the most "rounded" products of mechanical crushers.
Angularity is minimized because particles often collide with each other (abrasion smooths edges).
Low flakiness, making it ideal for high-performance aggregates.
Example Applications: Producing sand for concrete or golf course bunkers.
Mechanism: Uses two rotating rolls (smooth or toothed) to crush materials by compression and shear.
Product Shape:
Relatively flat or slab-like if rolls are smooth, with some angularity.
Toothed rolls produce more irregular, fragmented shapes.
Tends to create larger, coarser particles with moderate uniformity.
Example Applications: Crushing coal, salt, or soft minerals.
Mechanism: High-speed rotating hammers strike and shatter materials, often combined with a screen to control particle size.
Product Shape:
Irregular and angular, with a wide range of sizes (from fines to coarse fragments).
May produce flaky particles if the material is fibrous or brittle.
Example Applications: Crushing biomass, fertilizers, or brittle minerals.
