A calcite grinding plant is an industrial facility designed to grind calcite mineral (calcium carbonate, CaCO₃) into fine powder (typically micron-level). Calcite is widely used in industries like paints, plastics, paper, construction, and chemicals due to its brightness, whiteness, and chemical purity. The plant processes raw calcite into powdered form with controlled particle size.

Key Components and Working Principle:

  1. Crushing Unit:

    • Large calcite chunks (10-50 cm) are reduced to 1-5 cm using a jaw crusher or hammer crusher.

  2. Grinding Mill:

    • Raymond Mill: Uses high-pressure rollers to grind material to 80-400 mesh (180-38 microns).

    • Ball Mill: Achieves 400-2500 mesh (38-5 microns) via steel balls’ impact and friction.

    • Vertical Roller Mill (VRM): Energy-efficient, low-noise, ultra-fine grinding (up to 2500 mesh).

  3. Classifier:

    • Air classifier or screening systems separate particles by size. Fine particles are collected, while coarse ones are recycled.

  4. Dust Collection System:

    • Bag filters or cyclones capture dust to protect the environment and workers.

  5. Packaging and Storage:

    • Ground calcite is stored in silos and packed into bags or big bags via automated systems.

Process Steps:

  1. Raw Material Feeding: Calcite blocks are fed into the crusher.

  2. Coarse Crushing: Material is reduced in size.

  3. Fine Grinding: Crushed material is micronized in the mill.

  4. Classification: Desired particle size is separated.

  5. Dust Control: Filters capture airborne particles.

  6. Storage and Dispatch: Product is packaged for sale.

Applications:

  • Paints & Coatings: Enhances brightness and opacity as a filler.

  • Plastics & Rubber: Improves product durability.

  • Paper Industry: Adds whiteness and smooth texture.

  • Construction: Used in gypsum, putty, and cement.

  • Agriculture: Balances soil pH.

Advantages:

  • High Efficiency: Automated continuous production.

  • Energy Savings: VRM reduces energy use by 30-50%.

  • Eco-Friendly: Near-zero dust emissions.

  • Flexibility: Adjustable fineness for diverse needs.