What is Primary, Secondary and Tertiary Crushing ?

What are the three stages of crushing?

There are several methods for breaking hard materials like rock and making them fit to be used, and according to your area of activity, project characteristics, and the machinery you are using, a path shall be drawn and planning made accordingly, especially when it comes to product size.

The targeted diameter product can be obtained by passing the first, second, and third crushing stages of the materials to be crushed, which is dependent on the material type such as aggregate, concrete, and asphalt, and could be dependent on the variety of dimensions of the product targeted to be produced.

Primary Impact Crusher:

A primary horizontal impact crusher and a primary horizontal shaft impact crusher are machines that house very rugged crushing equipment, built with large feed size and high capacity crushing in mind. This naturally makes it apply as the first consideration in any demolition or recycling project of most forms of construction material, quarry, and mining industries generally. Primary impact crushers are characterized by a high reduction ratio, as well as very good particle shape. Material fed into the rotor of heavy-duty hammers or blow bars fixed on a rotor is impacted. They are also known to be very reliable and perform excellently in abrasive materials. Therefore, they can be used with efficiency.

Secondary Impact Crusher:

Secondary impact crushers or secondary horizontal shaft impact crushers used after the primary crushing stage are useful for further reduction of the material. Due to the aforementioned features, they find their most common application in the case of mediumsized and harder materials for aggregate production and mining. The secondary impact crushers basically are similar in design to the primary ones but are usually fitted with different rotor speeds and additional crushing chambers on the rotor to help improve the particle shape of the final product. These crushers develop high throughput capacities and are crucial in producing high-quality end products.

Tertiary Impact Crusher:

The tertiary horizontal shaft impact crushers or the tertiary impact crushers are used during the final stage of crushing so that the crushed materials are finely crushed for such specific applications. Because of this, most tertiary impact crushers are applied precisely in areas where the product shape and size are crucial, such as in manufactured sand production or finely graded aggregate. The design features for rotor designs are peculiarly done, coupled with impact aprons that could be adjusted to regulate the size and shape of the crushed material. Tertiary impact crushers are developed for Find shaping of the end product with high performance and low manufacturing of fine aggregates, suitable for various crushing tasks.

Primary crushing is the first stage of processing the material and may be all that is required to produce the product within the desired size. The primary crusher receives oversized material from the mine to be blasted, excavated, or recovered to feed the crusher and transfers it through a crusher, jaw, or rotary crusher to make products of various sizes.

This will be a closed-loop mobile primary crushing and screening plant that has the capability to screen the product desired by many aggregate producers. If a wider range of product is desired, concrete and asphalt processing may require a secondary and possible third crusher.

The secondary crushing, after the first crushing, is the next stage of processing. Subsequently, the product to be crushed, after passing through the respective crusher or cone crusher, shall undergo the effective crushing of such material.

Third and fourth crushing stages are also employed in getting smaller material sizes. Besides the second crushing, an open circuit portable crushing plant can be used, where processed material is transferred from one crusher to another after screening.
Using more crushers after the primary crusher makes a crushing-screening process much more effective. Not only does it offer various sizes of product but, in an open circuit crushing plant, the flow and processing of the material is easier and it increases efficiency as compared to a closed circuit crushing plant.

The crushing and screening plants produced by Polygon Mach, on the other hand, range from mobile crushing and screening plants, both closed circuit and open circuit, producing powerful crushers such as primary, secondary, and tertiary crushers, horizontal shaft crushers, jaw crushers, and cone crushers. For more information, contact a project representative at Polygon Mach, and we can assist you in determining which type of crusher machinery to be utilized based on your proposed project.

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