Give the most used crusher as primary crusher and its types? If you want to obtain certain product size which one you prefer among them? Why?
The correct answer and explanation is :
The most commonly used primary crushers are Jaw Crushers. Jaw crushers are preferred in many industries for their ability to handle a wide range of materials, including hard and abrasive rocks, which makes them ideal for primary crushing in quarries and mining operations.
Types of Primary Crushers:
- Jaw Crusher: This is the most widely used primary crusher. It operates by using compressive force to break down material. The material is fed into a V-shaped cavity, where it is crushed between a stationary and a moving jaw.
- Gyratory Crusher: Another type of primary crusher, this is similar to a jaw crusher but has a conical shape. It uses a gyrating motion to break down material. Gyratory crushers are typically used for larger volumes of materials.
- Impact Crusher: Though more common for secondary and tertiary crushing, impact crushers are sometimes used for primary crushing as well. They work by using impact rather than compression, breaking materials with high-speed blows.
- Hammer Crusher: In certain cases, hammer crushers are used for primary crushing. These crushers use a series of hammers mounted on a rotor to crush material by impact.
Preferred Crusher for Specific Product Size:
When selecting a primary crusher to obtain a particular product size, the Jaw Crusher is often the preferred option, especially when a consistent and relatively coarse product is required. The reason is that jaw crushers can be adjusted to produce a wide range of material sizes, and their output can be easily controlled.
For finer product sizes, a Gyratory Crusher or Impact Crusher may be considered. Gyratory crushers provide a more uniform product size, while impact crushers are suitable for producing finer aggregates with a more consistent shape.
However, if the desired product is very fine (like sand or powder), jaw crushers may not be as effective, and specialized crushers (e.g., cone crushers or hammer mills) may be more appropriate. Generally, the choice of the crusher depends on the material hardness, desired size reduction, and production volume.