For the crushing of hard rocks such as granite, basalt, and tuff, special attention should be paid to their high hardness (Mohs hardness 6-7), high wear resistance, and high silicon content to solve the problems of fast equipment wear, high energy consumption, and high maintenance costs.

1. Coarse crushing stage

General equipment: Jaw crusher, with deep cavity design and high manganese steel jaw plate, has strong crushing capacity and can crush large pieces of raw ore to 100-300mm.

Gyratory crusher: Single machine processing capacity of more than 2000 tons/hour, suitable for ultra-large-scale mining crushing and sand and gravel processing projects, with relatively high investment.

2. Medium and fine crushing stage

Laminated crushing equipment is preferred, which can greatly reduce equipment wear and low maintenance costs in the later stage.

Large-scale sand and gravel production lines usually adopt: single-cylinder hydraulic cone crusher + multi-cylinder hydraulic cone crusher combined crushing mode, sharing the single-stage crushing pressure, higher crushing efficiency, better finished product particle shape, less needle-like.

3. Sand making stage

It is recommended to use a vertical shaft impact crusher that can switch between "stone hitting stone" and "stone hitting iron" crushing modes, which can utilize the interaction between stones to reduce the impact and wear on the machine.

At the same time, the impact crusher also has the function of stone shaping, which can be used for two purposes in one machine, and is suitable for hard rock crushing projects with high requirements for stone particle shape.