The crushing ratio of crusher has a reasonable usable rang; we can choose the suitable crushing ratio according to the materials type and the stone's characteristic in each crushing step. When crush the hard and strong corrosive stones, the crushing ratio on each grade should be chosen smaller.

1. Coarse crushing (first and secondary coarse crushing)

Feeding materials granularity: ≤l500mm

Discharging granularity: 100-300mm

Crusher type: gyratory crusher, jaw crusher

2. Medium crushing

Feeding materials granularity: l00-450mm

Discharging granularity: 32-125mm

Crusher type: standard cone crusher, gyratory crusher, jaw crusher, impact crusher, roller crusher

3. Fine crushing

Feeding materials granularity: 110-150mm

Discharging granularity: 5- 25mm

Crusher type: jaw crusher, impact crusher, short-head cone crusher, roller crusher