In secondary crushing, several types of equipment are employed to reduce the size of the materials further after primary crushing. Here are some commonly used equipment:
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Cone Crushers:
- Cone crushers are ideal for secondary and tertiary crushing. They crush materials by squeezing them between a gyrating spindle and a concave hopper.
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Impact Crushers:
- Specifically designed for secondary crushing, these machines use high-speed impacts from rotating bars (blow bars) inside a chamber to break the materials.
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Roll Crushers:
- Roll crushers are used for intermediate crushing and consist of two rotating cylinders that crush materials between them, offering relatively good control on output size.
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Hammer Mills:
- Hammer mills involve a rotor fitted with hammers that crush the material upon impact, commonly used for more abrasive materials.
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Secondary Jaw Crushers:
- Although less common than cone or impact crushers, some applications make use of secondary jaw crushers for further reducing size and preparing for tertiary crushing.
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Vertical Shaft Impactors (VSIs):
- VSIs use high-speed rotors with wear-resistant tips that catch and throw materials against anvil surfaces to crush them, suitable for making cubical-shaped particles.
Each type of crusher offers unique advantages and is suited to specific material types and desired product sizes. Selecting the appropriate equipment depends on factors such as the nature of the material, desired product size, capacity, and overall processing needs.
