What is Reduction Ratio?

The reduction ratio refers to the ratio of the size of the feed material to the size of the crushed product. It quantifies the extent to which crushers can reduce the size of the incoming material.

Mathematically, the reduction ratio is calculated by dividing the size of the feed material by the size of the product. For example, if the feed material has a size of 100 millimeters (mm) and the product size after crushing is 20 mm, the reduction ratio would be 5:1 (100/20 = 5). This means that the crusher has reduced the size of the material by a factor of 5.

A higher reduction ratio indicates a more efficient crushing process, as it signifies a greater reduction in size. This is often desirable in the aggregate and mining industries, where reducing the size of the material enables easier handling, transport, and further processing. Additionally, a higher reduction ratio can improve the liberation of valuable minerals in mining applications.

Furthermore, the reduction ratio is not a constant value throughout the entire crushing process. It may vary depending on the initial size distribution of the feed material and the specific crusher design. In some cases, multiple stages of crushing are employed to achieve the desired reduction ratio.