What Equipment Does a Sand and Gravel Plant Need, How to Design the Process Flow

05/08/2026

The demand for high-quality sand and aggregates is rising steadily, driven by infrastructure projects, road construction, and the concrete industry. Setting up an efficient sand and gravel plant (also known as a crushing and screening plant) requires careful selection of equipment and a well-designed process flow. Below is a comprehensive guide to the essential machinery and the typical layout of a sand and gravel processing line.

1. What Equipment Is Needed for a Sand and Gravel Plant?

The equipment list varies depending on raw material type (hard rock, river pebble, limestone, granite, or recycled concrete), capacity requirements, and final product specifications. However, a complete sand and gravel plant generally includes the following core equipment:

A. Feeding Equipment

• Vibrating Feeder: Transfers raw materials from the hopper to the primary crusher evenly and continuously. It removes some fine material (fines) to prevent blockage.

• Grizzly Feeder: Used for coarse screening before primary crushing, especially when raw material contains oversize boulders.

B. Crushing Equipment (Size Reduction)

• Jaw Crusher – Primary crushing. Handles large feed sizes (up to 1.2m) and reduces rock to 150–300mm.

• Cone Crusher – Secondary or tertiary crushing for hard, abrasive rocks (granite, basalt). Produces well-shaped aggregates.

• Impact Crusher (HSI or VSI) – HSI for medium-hard rock; VSI (Vertical Shaft Impactor) is ideal for sand making and shaping aggregates to cubic form.

• Hammer Crusher – Suitable for brittle materials like limestone (less abrasive).

C. Screening Equipment

• Vibrating Screen (circular or linear): Separates crushed material into different size fractions (e.g., 0–5mm sand, 5–10mm, 10–20mm, 20–31.5mm gravel). Multiple decks (layers) are common.

• High-Frequency Screen: Used in fine sand recovery or dewatering processes.

D. Sand Washing & Fine Recovery (for manufactured sand)

• Wheel or Screw Sand Washer: Removes dust, clay, and impurities from artificial sand.

• Fine Sand Recovery Unit: Reduces loss of fine sand particles (0.16–1mm) in waste water.

• Hydrocyclone: Classifies and deslims fine particles, often paired with a dewatering screen.

E. Conveying System

• Belt Conveyors: Connect all processing stages. They are energy-efficient and can be customized in length and width.

F. Auxiliary Equipment

• Dust Suppression System (baghouse filters, water sprays, or dry fog systems) – mandatory for environmental compliance.

• Control Cabinet / PLC Automation: For centralized operation and monitoring.

• Magnetic Separator: Removes tramp iron/nails (important if recycling waste concrete or using jackhammers).

2. How to Design the Process Flow?

The process flow is designed based on feed material characteristics, desired output sizes, and capacity. Below is a typical three-stage crushing and screening process for a hard rock (e.g., granite) gravel plant producing both aggregate and manufactured sand.

Stage 1: Feeding and Primary Crushing

• Flow: Raw material (e.g., blasted rock <750mm) → Vibrating hopper/Grizzly feeder → Jaw Crusher (PE750×1060).

• Output: Material size ~150–200mm.

• Note: A grizzly bar in the feeder removes fine soil/debris (<30mm) which bypasses the crusher to avoid clogging.

Stage 2: Secondary Crushing and First Screening

• Material from jaw crusher is conveyed to a vibrating screen (2-deck).

• Screen oversize (>40mm) → goes to Cone Crusher or Impact Crusher (secondary crushing).

• Screen middlings (10–40mm) → part as final aggregate, part to tertiary crushing.

• Screen undersize (<10mm) → may go to sand making or washing.

Stage 3: Tertiary Crushing and Shaping / Sand Making

• Material from secondary crusher and middlings return is fed into a VSI Crusher (Sand Making Machine).

• VSI output → final vibrating screen (3 or 4 decks).

• Screen yields:

• 0–5mm – manufactured sand.

• 5–10mm – small gravel.

• 10–20mm – standard concrete aggregate.

• 20–31.5mm – coarse gravel (may be recirculated if needed).

Stage 4: Sand Washing and Fine Recovery (if wet process)

• 0–5mm product is fed to a Screw Sand Washer plus Hydrocyclone + Dewatering Screen.

• Clean sand (moisture 12–15%) is stockpiled.

• Waste water + fines → settling pond or filter press (closed-loop water system).

Stage 5: Stockpiling and Loading

• Separate belt conveyors discharge each sized product into stockpiles (conical, bunker, or dome).

• Underground reclaim tunnel or wheel loader recovers products for truck dispatch.

3. Two Common Process Layout Types

4. Key Design Considerations

• Feed material analysis – abrasion index, work index, moisture content, clay presence. High clay → add a scrubbing stage (log washer).

• Capacity – From 50 t/h small-scale to 1500 t/h large quarry.

• Final product requirements – Superpave specifications, concrete sand grading curve (Zone II/III).

• Environmental compliance – Enclose crushers/screens, use wet dust suppression, noise barriers, and water recycling.

• Maintenance access – Provide walkways, cranes for major parts (jaw dies, rotor tips), and easy screen media replacement.

Conclusion

Setting up a sand and gravel plant is a significant investment that hinges on choosing the right equipment and designing a logical, balanced process flow. Start with a jaw crusher for primary reduction, follow with cone or impact crushers, and use vibrating screens to separate sizes. For manufactured sand, a VSI crusher plus a washing system is essential. Always plan dust control and water recycling early. With a well-designed flow, you can achieve high output, consistent quality, and operational safety.