What Is A Reduction Ratio Of Crusher?

The reduction ratio in crushing is the ratio of the feed size to the product size during a crushing operation. It usually varies, but the reduction ratio depends on the chamber and nut adjustments. However, the best particle shape is found in material about the same size as the CSS, which is the smallest discharge opening dimension on the jaw crusher

The Importance Of Reduction Ratio For Crushing

There are several benefits of reduction ratio for crushing, but one of the most important is that it indicates the material’s flexibility. In simple terms, the reduction ratio helps determine how well a material can withstand deformation. Other benefits of reduction ratio for crushing include:

  • Aiding ease of transportation and storage of material.
  • Obtaining the desired size of material for different construction purposes.
  • Separating unwanted contaminants from the material to be crushed. 

How Can Crushing Reduction Ratio Increase The Crushing Efficiency?

Crushing efficiency is the ratio of a crusher’s operation to the fed material size to give the required size. Hence, increasing the crushing efficiency with the jaw crusher reduction ratio depends on the amount of material fed into the crusher’s chamber.

For instance, a jaw crusher with a choke-fed chamber performs best and maximizes production capacity while producing uniformly broken particles. As such, a choke-fed chamber increases your crusher capacity and efficiency.

In contrast, you require a non-choke chamber for fewer fines; to achieve this, you must trickle-feed your material into the crusher. However, this would not give the best particle shape and would affect your crusher’s efficiency by reducing its capacity.

What Are The Different Crusher Types And Their Ratios?

Typically, crushing is carried out in stages to get desired results. Below we will discuss the different crusher types and what you can expect regarding their reduction ratio during use. 

Primary Crusher

There are several primary crushers, including jaw crushers, gyratory crushers, roll crushers, etc. The right one for primary crushing often depends on the material to be crushed, but the reduction ratio of jaw crushers are usually between 8:1 and 6:1.

Secondary Crusher

These crushers break down materials into smaller sizes and often have a reduction ratio less than 3:1 in crushing. A secondary impactor, hammermill, and cone crusher are popular secondary crushers. Still, note that you may use a jaw crusher as a secondary crusher in some cases. 

Tertiary Crusher

In some crushing operations, you may require more rounds of crushing after secondary crushing. In such cases, equipment with a high reduction ratio in crushing, such as a conveyor and screener, is valuable at this point to aid multiple crushing sequences and reduce waste. 

Final Thoughts

The reduction ratio in crushing is important because it’s the factor that enables crushing machines to deliver the amount of reduction required to get desired results and material shapes. 

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