Understanding Secondary Crushing Options
After primary jaw crushing, the feed material requires further size reduction to produce salable aggregate or feed for grinding circuits. The two most common secondary crusher types are cone crushers and horizontal shaft impact (HSI) crushers — each with distinct characteristics suited to different applications.
How Cone Crushers Work
Cone crushers use a rotating mantle inside a concave bowl to compress material against the bowl liner. The eccentric motion of the mantle creates a continuous crushing action that produces well-graded, cubical product with low flake content. Cone crushers excel at processing hard, abrasive materials such as granite, basalt and iron ore.
Advantages of Cone Crushers:
- Excellent reduction ratio (4:1 to 8:1 depending on chamber)
- Superior product shape — cubical with low flakiness
- High throughput for hard rock applications
- Lower operating costs per ton for abrasive materials
- Consistent product size distribution
- Better suited for high-pressure crushing of competent rock
Limitations:
- Higher capital investment
- Requires careful operation to avoid steel-on-steel contact
- Not ideal for sticky or clayey materials
- Less effective for producing manufactured sand from soft limestone
How Impact Crushers Work
Impact crushers use a spinning rotor with blow bars or aprons to strike and fracture material. The impact breaks material against breaker plates, producing a more fractured, angular product. HSI crushers are particularly effective for softer to medium-hardness materials and excel at producing manufactured sand.
Advantages of Impact Crushers:
- Lower capital cost than cone crushers
- Excellent for producing cubical products from softer materials
- High reduction ratio in a single pass
- Better suited for recycling applications (concrete, asphalt)
- Can produce excellent manufactured sand (m-sand) for concrete
- Better tolerance for sticky or clay-contaminated feed
Limitations:
- Higher wear rates on blow bars and aprons in abrasive applications
- More susceptible to damage from tramp metal
- Higher operating costs for very hard, abrasive rock
- May produce more fines than cone crushers for hard rock
Selection Criteria: Material Properties
Choose Cone Crusher When:
- Processing hard, abrasive rock (granite, basalt, iron ore, copper ore)
- High throughput requirements (500+ t/h per crusher)
- Product shape and gradation consistency are critical
- Operating in a grinding circuit where low operating cost is essential
Choose Impact Crusher When:
- Processing softer materials (limestone, sandstone, coal, salt)
- Producing manufactured sand for concrete and asphalt
- Recycling demolition waste (concrete, brick, asphalt)
- Lower capital budget with acceptable higher wear rates
- Feed material may contain some tramp metal or rebar
Operating Cost Comparison
For hard rock applications, cone crushers typically offer 20-40% lower operating costs per ton due to longer wear part life. Impact crushers may have 30-50% lower initial capital cost but wear parts (blow bars, aprons) may need replacement 2-4x more frequently in abrasive conditions.
WSHT Cone Crusher — Designed for High-Capacity Hard Rock Crushing
WSHT Equipment Recommendations
WSHT supplies both cone crushers and impact crushers with comprehensive selection support. Our applications engineers will analyze your material test results, capacity requirements and product specifications to recommend the most cost-effective solution for your specific project conditions.
