Sources for making aggregate can be grouped into three main areas: mining of mineral aggregate deposits, including sand, gravel, and stone; use of waste slag from the manufacture of iron and steel; and recycling of concrete, which is itself chiefly manufactured from mineral aggregates. In addition, there are some (minor) materials that are used as specialty lightweight aggregates: clay, pumice, perlite, and vermiculite.
Aggregates themselves can be recycled as aggregates. Unlike deposits of sand and gravel or stone suitable for crushing into aggregate, which can be anywhere and may require overburden removal and/or blasting, "deposits" of recyclable aggregate tend to be concentrated near urban areas, and production from them cannot be raised or lowered to meet demand for aggregates. Supply of recycled aggregate depends on physical decay of structures and their demolition. The recycling plant can be fixed or mobile; the smaller capacity mobile plant works best for asphalt-aggregate recycling. The material being recycled is usually highly variable in quality and properties.
Aggregate crushing and screening plant
Either by mining of mineral aggregate deposits or by recycling of concrete, in order to get aggregate for highway, railway and road building, the complete aggregate crushing and screening plant is necessary, which includes primary crusher, secondary crusher, sand making machine, vibrating feeder, vibrating screen and belt conveyor.
In aggregate crushing and screening plant, stones firstly enter into jaw crusher for primary crushing, and then through belt conveyor evenly enter into impact crusher or cone crusher for fine crushing. Finally, through VSI crusher stones mainly are cubic in shape. vibrating screen is used as screening machine to screen out the different size of stone. The stone that are unqualified return to the crushing plant for crushing again.
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