Granite raw materials are great in volume. We need to crush the granite into gravel and sand in building aggregates. Therefore, it needs to go through coarse crushing, medium crushing and fine crushing. Only after the three crushing stages can we get the required particle size distribution of building aggregates that meet the requirements.
 
1. Granite Coarse Crushing
 
Coarse crushing is usually carried out by equipment that uses lamination technology. Normally, the jaw crusher is used in sand and gravel yards. The jaw crusher has simple structure and stable operation. It has large crushing capacity, various feed port specifications, and can engulf larger tubers of crushed materials. The jaw crusher is suitable for coarse crushing of various materials.

 
2. Granite Medium Crushing
 
Since granite is very wear-resistant and has a high hardness, the wear-resistant parts are severely worn during the crushing process. Therefore, it is necessary to first crush the granite to a size close to the required finished product particle size before the final shaping and crushing. Among all crushers, the crushing equipment that adopts the lamination principle has the lowest loss of vulnerable parts, so the middle crushing stage still uses the lamination crushing equipment. In the middle crushing stage, you can choose a fine jaw crusher or a cone crusher with the lamination crushing principle as the middle crushing of granite. If the production capacity demand is large, it is recommended to use a cone crusher. The cone crusher can be fully fed, the discharge port particle size can be adjusted in a wide range, and it can basically produce qualified products with uniform particle shape (if the finished product particle shape requirements are not so strict, the stone crushed by the cone crusher can be used as the finished product).

 
3. Granite Fine Crushing
 
After the first two stages of coarse and medium crushing, the original large tubers of granite have basically been crushed to a particle size close to that of finished building aggregates. However, if there are requirements for the particle shape of the finished product, or if granite sand is required, fine crushing is still required. We can call this stage of fine crushing "shaping crushing" or sand making crushing. It is most appropriate to use an impact crusher or a vertical shaft impact crusher for this crushing stage. The choice of these two types of equipment depends on the requirements of the sand and gravel ratio. If the required ratio of gravel is higher, then we can use an impact crusher for fine crushing. If the required ratio of sand is higher, then we use a vertical shaft impact crusher for the final fine crushing.

 
4. Granite Screening and Grading
 
After being crushed by the crusher, the granite needs to be screened. The stones or sand that meet the particle size requirements are transported to the finished material area through a conveyor belt, and the stones that do not meet the specification requirements are returned to the crusher for re-crushing.