Reduction ratio: The average number of pieces the raw feed rock is reduced into.
Reduction ratio of Cone crusher
A crusher that breaks material by squeezing or compressing it between convex and concave shaped surfaces covered by manganese as the wear surface. Normally used as the second or third stage crusher. Uses compression to crush. Reduction ratio is 6-8 to 1.
Reduction ratio of impact breaker
Operates much in the same method as a single impeller, with counter-rotating (two) impellers which not only impel the material against the breaker bars, but also impel material high inside the chamber to be fractured on other incoming feed. Uses impact to crush material. Reduction ratio is 20 to 1.
Reduction ratio of Jaw crusher
A crusher that breaks material by squeezing or compressing it between two jaw plates, one moveable and one stationary. Normally used as a primary crusher. Uses compression and some attrition to crush material. Reduction ratio is 6 to 1.
Reduction ratio of Vertical shaft impactor
A crusher whose main mechanism rotates around a vertical axis. The rock is fed into the crusher and impacted or thrown by a table/ anvil configuration or anvil ring, and is crushed by impact either by manganese wear plates or rock-on-rock strikes. Often used to make fines or manufactured sand. Uses impact to crush materials. Reduction ratio of 4-8 to 1.
Reduction ratio of roll crusher
A crusher that breaks material by squeezing it between two revolving metal cylinders, with axes parallel to each other and separated by a space equal to the desired maximum size of the finished product. Uses compression to crush material. Reduction ratio is 2 to 2.5 to 1. There are also triple roll crushers able to handle larger feed sizes. They also produce fewer fines per pass than do cone crushers. Roll crushers are good for producing road chips. Not recommended for abrasive rock, but very good crushing limestone.
Reduction ratio of Gyratory crusher
Crusher with a central conical member having an eccentric motion in a circular chamber tapering from a wide top opening.
Reduction ratio of Hammer crusher
A rock crusher that employs hammers or flails on a rapidly rotating axis. The hammers are usually made of manganese. Uses impact and attrition to crush material. Reduction ratio is 20 to 1.