An aggregate washing and screening plant is an industrial facility designed to remove impurities (clay, soil, organic debris) from construction materials like sand, gravel, and crushed stone, and classify them by size. These plants enhance aggregate quality and homogeneity, ensuring compliance with standards for concrete, asphalt, and other building materials.

Components:

  1. Feeding Unit: Vibratory feeder or belt conveyor for consistent material input.

  2. Screening Unit:

    • Vibrating Screens: Separate materials into size fractions (e.g., 0-5 mm, 5-15 mm) using layered mesh decks.

    • Trommel Screen: Rotating drum for screening moist or sticky materials.

  3. Washing Unit:

    • Log Washer: Uses rotating shafts with paddles to scrub and dislodge clay.

    • Screw Washer: Mixes aggregates with water for thorough cleaning.

    • Hydrocyclone: Centrifugal force separates fine particles (silt) from water.

  4. Water Recycling System: Clarifies and recycles water via settling ponds or filters.

  5. Belt Conveyors: Transport materials between processing stages.

  6. Control Panel: Manages automation and energy efficiency.

Operating Principle:

  1. Feeding: Raw aggregate is fed into the plant via conveyors.

  2. Pre-Screening: Vibrating screens remove oversized debris.

  3. Washing: Log/screw washers and hydrocyclones eliminate contaminants.

  4. Final Screening: Aggregates are classified into specific sizes (sand, gravel).

  5. Water Treatment: Wastewater is purified and reused, minimizing environmental impact.

Applications:

  • Concrete and asphalt production,

  • Road construction and infrastructure projects,

  • Quarries (stone, sand processing),

  • Recycling plants (processing construction debris).

Advantages:

  • High Quality: Produces durable, contaminant-free aggregates.

  • Sustainability: Reduces water consumption through recycling.

  • Efficiency: Processes 50-500 tons per hour.

  • Versatility: Handles diverse aggregate types and sizes.