rock quarrying and aggregate manufacturing plant

As a technique, quarrying is normally only used where raw materials of adequate quality and size cannot be obtained economically by other means. Since natural sand and gravel are not always readily available, for example, a large proportion of the world''s annual output of aggregates is produced by quarrying and processing rock.

Development of most modern rock quarries involves stripping the overlying soil and weathered rock to get to the hard rock underneath. This is then worked in a ''bench'' system, removing the rock in layers that can be returned to year after year as the quarry is developed.

In this process, log washer, heavy media separator, and attrition mill are used to ensure quality of aggregates. A quarry is an excavation or pit, usually open to the air from which quarry resources are obtained, usually rocks found on or below the ground surface. Quarry plays a big role in the construction industry.

They are essential for producing asphalt, concrete, and cement in the construction industry, fueling the growth of aggregate processing plants. The aggregate plants use crushers, screens, and sand washers for coarse and fine aggregates. Successfully setup requires considering the aggregate market, plant design, and necessary equipment.

Consequently, soft sedimentary rocks and material that breaks into flat, flaky pieces are often unacceptable as raw materials for aggregate. On the other hand, igneous rocks such as granite and basalt, as well as highly metamorphosed rocks such as gneiss, are well-suited to aggregate production.

The mined aggregate is much larger than the final product, so crushers are used to break it down into smaller particles. The aggregate crushing plant design should be tailored to different production requirements (raw material, capacity, and output size). Generally, the multi-stage crushing principle is adopted. 1. Primary crushing