A Granite Crushing and Screening Plant is an industrial facility designed to process granite, an igneous rock, into various sizes for construction, decorative, and infrastructure projects. Granite’s durability, abrasion resistance, and aesthetic appeal make it ideal for high-demand applications. These plants produce aggregates, sand, gravel, and decorative stones through mechanical processing.

2. Operational Process
A. Raw Material Extraction and Preparation:

  • Granite blocks are extracted from quarries via blasting, wedging, or hydraulic splitters.

  • Blocks (1-2 meters) are transported to the feed hopper using excavators or trucks.

  • Grizzly Screen: Filters oversized rocks to ensure uniform feeding into crushers.

B. Crushing Stages:

  • Primary Crushing:

    • Jaw Crusher: Reduces granite to 100-300 mm through compressive forces between fixed and moving jaw plates.

    • Impact Crusher: Fragments granite using high-speed rotors and impact plates, ideal for low-dust operations.

  • Secondary Crushing:

    • Cone Crusher: Achieves 20-50 mm particles via interparticle crushing between a rotating mantle and stationary concave.

    • Horizontal Shaft Impactor (HSI): Further reduces material size with horizontal impact forces.

  • Tertiary Crushing:

    • Vertical Shaft Impactor (VSI): Produces finely crushed aggregates (3-15 mm) for specialized uses like decorative sand.

C. Screening and Washing:

  • Vibrating Screens: Multi-deck screens classify materials into sizes (e.g., 0-5 mm sand, 10-30 mm gravel).

  • Sand Washers: Log washers or wheel bucket systems remove impurities (clay, dust) from fine aggregates.

D. Material Handling:

  • Belt Conveyors: Transport materials between crushers, screens, and stockpiles.

  • Storage Silos: Store categorized products (coarse aggregates, sand) for dispatch.

E. Automation and Safety:

  • PLC Systems: Monitor production efficiency, energy consumption, and equipment health in real time.

  • Safety Mechanisms: Emergency stop buttons, dust suppression systems, and vibration sensors.

3. Applications

  • Construction and Infrastructure:

    • High-Strength Concrete: Granite aggregates enhance structural integrity in bridges and skyscrapers.

    • Asphalt Pavements: Durable road surfaces resistant to heavy traffic.

    • Railway Ballast: Provides stability and drainage for railway tracks.