What is the difference between hard rock crushing and soft rock crushing? What crusher should I choose?
According to different hardness, mechanical sand and stone raw materials can be divided into two categories: hard rock and soft rock.

Hard rock is mainly represented by granite, basalt, river pebbles, pebbles, etc., its hardness is basically above 150Mpa, and the wear of the crusher is large and the crushing difficulty is relatively high.

When processing such raw materials, it is usually considered to use a jaw crusher and a cone crusher, and then use an impact crusher (shaping machine) to shape according to the requirements of the finished product to eliminate the needle sheet and internal cracks generated by the stone in the crushing project. Finally, the vibrating screen is used for sorting, and the crushed stone is sorted into the finished sand and stone aggregate of various specifications.

Soft rock mainly includes limestone, wind fossil, sandstone, etc., and its hardness is below 150Mpa.

The choice of crusher can be considered jaw crusher, impact crusher, hammer crusher. Also according to the requirements of the finished product can be combined with the impact crusher (shaping machine) to shape, in the process of eliminating the stone in the crushing process of the needle sheet and internal cracks, at the same time to improve the production of machine-made sand. Generally, the sand rate can reach about 60%.

The hardness of limestone varies greatly according to its silicon content. When we judge the hardness of stone, we must pay attention to the fact that if it is a limestone with a high silicon content, it is necessary to choose a cone crusher when crushing and processing.

In addition, the choice of crusher also needs to consider the site, finished product requirements, mud content and other factors, specific analysis.