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Ground Calcium Carbonate (GCC) Production Process with HGM Ultrafine Grinding Mill.
HGM ultrafine mill for GCC Production Process
• Mine or quarry high-calcium limestone, marble or chalk.
• Primary jaw crusher → hammer / impact crusher reduces lumps to ≤ 25 mm .
• Belt conveyor and bucket elevator deliver crushed stone to a sealed storage hopper.
• Vibrating feeder ensures a steady, controlled feed rate into the HGM mill.
• Main grinding unit grinds material between high-pressure rollers and a multilayer ring.
• A variable-speed classifier instantly separates fines at 150-3000 mesh and recycles oversize.
• The sealed, negative-pressure loop yields 5–45 µm powder with 30 % less energy and zero dust.
• Feed size ≤ 20 mm, output 0.5–4 t/h at 1250 mesh (10 µm D97).
• Specific energy ≈ 30 % lower than ball-mill systems; noise < 80 dB(A) .
• Coarse particles rejected by the classifier fall back onto the grinding table for further reduction; fines proceed to collection.
• Sharp top-size cut delivers narrow particle-size distributions required for plastics, paints, paper coatings.
• Pulse-jet bag filter captures 99.9 % of airborne fines; filtered air is vented or recycled to the blower.
• Explosion vents and CO₂ inerting options meet ATEX / NFPA standards when handling ultra-fine powders.
• Continuous on-line coating unit injects stearic acid or other functional modifiers at 90–120 °C to improve dispersibility and hydrophobicity for polymer masterbatches.
• Rotary valve feeds finished GCC into big-bag or 25 kg valve-bag packers under inert gas flush if required.
• Integrated PLC records batch weight, fineness and moisture, ensuring traceability.
• Closed-loop, negative-pressure system eliminates dust leakage.
• Grinding ring and roller forged from special alloy give 12–24 months wear life under medium-hard limestone .
• Total plant footprint is < 150 m² for a 2 t/h, 1250-mesh line, facilitating retrofit into existing buildings.
• Brightness ≥ 95 % ISO, top cut 10 µm (1250 mesh), oil absorption 18–22 g/100 g (coated).
• Consistently meets the requirements of high-grade offset paper, PVC cable and automotive sealants.
HGM ultrafine grinding mill converts crushed limestone into ultrafine GCC powder in a single, energy-efficient step while maintaining strict environmental and quality standards.