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Primary crushing for aggregate production

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Primary crushing for aggregate production

June 30, 2023 nflg 0 Comments

Primary crushing

In stone quarries or in very “boney” gravel pits, large material usually is reduced in size by either a jaw crusher or a gyratory crusher . Both types are compression crushers . Although economical, they have the tendency to create thin, elongated particles. Particle shapes sometimes may be a problem for Producers of hot mix asphalt. In some operations impact crushers are used for primary crushing, but they may have a slightly higher cost per ton. Impact crushers may upgrade poor-quality aggregate and increase separation, such as removal of rebar from concrete in recycling operations.

After primary crushing/reduction the resulting aggregate generally is placed in a large “surge” pile where the aggregate may be fed into the secondary operation whenever convenient.

Care is always taken when building up and loading out surge piles, as this step may be a major source of segregation of material going to the secondary plant. Variation at this point may affect both mineral quality and gradation. Drawing from an inverted cone over a load-out tunnel works well after material has been deposited and left undisturbed to form the walls of the draw-down cone. If the need ever arises to consume the entire pile, care is taken to thoroughly mix the older material a little at a time with fresh product to make the surge as uniform as possible as the aggregate is being pushed into the tunnel. If the operation relies on end loaders to feed the secondary plant from the surge pile, the same care is taken to mix coarse with fine material from the outside to the inside of the pile.

Aggregate production line

Aggregate production line produce construction building aggregates widely used for making concrete production. Crushed stone aggregate is produced from many natural deposits including: limestone , granite, trap rock and other durable mineral resources.

Aggregate production line manufactured by NFLG machinery aims for producing crushed stone aggregate. The aggregate process consists by progressive stages of crushing, screening, and washing.

NFLG Machinery is a premier supplier of crushing and screening equipment , and related auxiliary equipment in China. We provide complete crushers and screen machineries for producing all types of aggregate, we also can supply the complete turn-key aggregate production circuit.

Complete stationary, portable, mobile aggregate crushing equipment are available. Our aggregate crusher equipment with ISO and CE certificates have been sold to over 100 countries around the world. Besides, we have established branch offices in many countries. We have different crushing plants, our professional staff will offer suitable solutions according to your requirements.

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