The Crusher Department...
...manufactures and sells stone crushing machinery. The concrete and asphalt products with which we are familiar contain a high proportion of crushed rock and sand. The Crusher Department is concerned with equipment for production of suitable crushed rock (aggregate) by size reduction of quarried rock.
Rock quarries are the normal home of rock crushers. Material up to about 800mm blasted from the ground is reduced in size to the correct specification for final use. Aggregates for concrete are usually crushed to 20-0mm.
A conventional quarry process may consist of at least three crushing stages, a minimum installation beginning with a primary (jaw) crusher to reduce all the material to less than 150-200mm. A secondary (cone) crusher is used to crush this down to around 40mm, and finally a tertiary (VSI) crusher can shape and grade the final product ready for use in concrete or asphalt.