Granite crushed stone
Crushed stone production includes two main stages:
Extraction of raw materials for the manufacture of material;
Processing of raw materials.
Crushed granite is mined by blasting rocks, which are pre-cleaned of soil and plants. At this stage, the rock is crushed primarily. Then the material goes to the enterprise, where crushing takes place in several stages. At the primary stage, jaw crushers are usually used, the principle of which is based on crushing the rock between two cheeks - mobile and stationary. At the subsequent stages, rotary, roller-toothed, hammer crushers are used. In the process of sorting, the crushed material is passed through overhead or stationary screens, on which it successively passes through several screens with a certain mesh size. As a result, crushed stone is divided into fractions in accordance with the existing requirements of GOST. The final stage is the delivery of finished products to customers.
Fine fraction - the size of the fraction does not exceed 20 mm. The material is used for crumbling paths, making small concrete products, as a decorative material.
Medium fractional - the size of fractions ranges from 20-40 mm. The material is used in the construction of buildings, the manufacture of concrete products, road works, etc.
Large-fraction - the size of the fraction is more than 40 mm. They are used in the same way as the medium fraction, but only for more massive structures.