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E-waste crushing involves the use of specialized crushers and mills to break down electronic waste (e-waste) into smaller, manageable pieces for recycling. Below is an overview of the key types of crushers used in e-waste processing:

1. Jaw Crushers
– Function: Primary crushing of large e-waste components (e.g., circuit boards, plastic casings, metal frames).
– Advantages:
– High reduction ratio.
– Robust construction for hard materials.
– Limitations:
– Not ideal for fine grinding.
– May generate dust and require additional separation steps.

2. Cone Crushers
– Function: Secondary crushing after jaw crushers, reducing e-waste into finer particles.
– Advantages:
– Efficient for medium-hard materials.
– Produces more uniform particle sizes than jaw crushers.
– Limitations:
– Higher maintenance than impact crushers.
– Less effective for very hard or brittle materials.

3. Hammer Mills / Impact Crushers
– Function: Shredding and pulverizing e-waste (especially plastics and non-metallic parts).
– Advantages:
– High-speed impact breaks down brittle materials efficiently.
– Can handle mixed waste streams.
– Limitations:
– Wear-prone due to abrasive componente.g., silica in PCBs).
– May require frequent replacement of hammers/blades.

4. Shredders & Granulators
(Often used alongside crushers)
– Function: Pre-crushing before finer milling (e.g., for separating metals from plastics).
– Types:
– Single-shaft shredders (for bulky items).
– Dual-shaft shredders (for tougher materials).

Key Considerations for E-Waste Crushing
– Material Separation: Crushers often work with eddy current separators, magnetic separators, and air classifiers to recover metals (Cu, Au, Ag) and plastics.
– Dust Control: E-waste contains hazardous substances (lead, mercury), so enclosed systems with filtration are essential.
– Automation: Advanced systems use AI-based sorting post-crushing to improve recovery rates.

Applications
– Printed Circuit Boards (PCBs): Jaw + Cone Crusher → Hammer Mill → Metal Recovery.
– Plastic Casings: Shredder → Granulator → Pel