Closed-circuit tertiary crushing and screening plants are advanced material processing systems used especially in construction, mining, and aggregate production sectors. These systems are designed for high efficiency, energy saving, and obtaining high-quality final products. The term "closed circuit" refers to the continuous cycle of material moving from the crusher to the screen and back to the crusher via a return conveyor until it reaches the desired size.

System Components

  1. Feeding System:
    Raw material is fed into the crusher in a controlled manner using vibrating feeders, which also help pre-separate fine material.

  2. Tertiary Crusher:
    This is the core of the system. It is usually an impact crusher or a cone crusher. At this stage, the material is crushed into smaller and more uniform particles.

  3. Vibrating Screens:
    Crushed material is classified into different sizes. Desired sizes are sent to the stockpile; oversized materials are returned to the crusher.

  4. Conveyors and Return Belts:
    These ensure the transfer of material throughout the system. Oversized material from the screens is transported back to the crusher to complete the closed loop.

  5. Dust Suppression and Filtration Units:
    To comply with environmental regulations, modern systems include dust suppression units, jet pulse filters, and water spraying systems.

Advantages

  • High Efficiency:
    Material remains in the system until it is the correct size, ensuring maximum efficiency.

  • Energy Savings:
    By recirculating oversized material, unnecessary crushing is minimized.

  • Lower Labor Requirement:
    Full automation minimizes the need for manual operation.

  • Mobility and Flexibility:
    Can be set up as mobile or stationary depending on site needs.

  • Consistent Product Quality:
    Final product meets granulometric specifications precisely.

Applications

  • Ready-mix concrete production

  • Asphalt plants

  • Road base and sub-base layers

  • Ballast and crushed stone production

  • Ore preparation in mining facilities

Conclusion

Closed-circuit tertiary crushing and screening plants are one of the cornerstones of modern construction and mining operations. With evolving automation technologies, these plants offer unmatched efficiency, product consistency, and environmental compliance. They are not only productivity drivers but also key to sustainable material processing.