Used stone crushing plant for sale not only has high efficient but also help to save much more money for contractors. Jaw crusher, impact crusher or gyratory crusher is usually used for initial reduction. The crusher product, normally 7.5 to 30 centimeters in diameter, and the grizzly through (undersize material) are discharged onto a belt conveyor and usually are conveyed to a surge pile for temporary storage or are sold as coarse aggregates. The stone from the surge pile is conveyed to a vibrating inclined screen called the vibrating screen. This unit separates oversized rock from the smaller stone. The undersized material from the vibrating screen is considered to be a product stream and is transported to a storage pile and sold as base material. The stone that is too large to pass through the top deck of the vibrating screen is processed in the secondary crusher.
Cone crushers are commonly used for secondary crushing (although impact crushers are sometimes used), which typically reduces material to about 2.5 to 10 centimeters. The material from the second level of the screen bypasses the secondary crusher because it is sufficiently small for the last crushing step. The output from the secondary crusher is transported by conveyor to the tertiary circuit, which includes a sizing screen and a tertiary crusher.
Tertiary crushing is usually performed using cone crushers or other types of impact crushers. The tertiary crusher output, which is typically about 0.50 to 2.5 centimeters, is returned to the sizing screen. Various product streams with different size gradations are separated in the screening operation. The products are conveyed or trucked directly to finished product bins, to open area stock piles, or to other processing systems such as washing, air separators, and screens and classifiers. Some stone crushing plants produce manufactured sand. This is a small-sized rock product with a maximum size of 0.50 centimeters. Crushed stone from the tertiary sizing screen is sized in a vibrating inclined screen with relatively small mesh sizes.
Oversized material is processed in a cone crusher or a hammer mill adjusted to produce small diameter material. The output is returned to the fines screen for resizing. In certain cases, stone washing is required to meet particulate end product specifications or demands.
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