Precipitated Calcium Carbonate (PCC) Processing Plants in the Crushing and Sand-Making Industry
The global construction and infrastructure sectors heavily rely on high-quality aggregates, manufactured sand (M-sand), and mineral fillers like precipitated calcium carbonate (PCC). PCC, a refined form of calcium carbonate, is widely used in plastics, paper, paints, and pharmaceuticals due to its controlled particle size and purity. In the crushing and sand-making industry, integrating PCC processing plants with traditional aggregate production lines offers added value by diversifying product portfolios.
1. Primary Crushing: Jaw crushers or gyratory crushers reduce limestone (CaCO₃) to 50–100 mm chunks.
2. Secondary Grinding: Hammer mills or cone crushers further crush limestone to <10 mm for calcination.
3. Calcination: Rotary kilns heat limestone (~900°C) to produce quicklime (CaO) and CO₂.
4. Hydration & Precipitation: Quicklime is slaked with water to form lime slurry (Ca(OH)₂), which reacts with CO₂ under controlled conditions to precipitate ultra-fine PCC crystals.
5. Classification & Drying: Hydrocyclones or centrifuges separate PCC particles, followed by spray dryers to achieve moisture content <1%.
1. Can PCC plants be integrated with existing aggregate lines?
Yes—shared crushing stages reduce capital expenditure, but dedicated precipitation tanks are required downstream.
2. What’s the typical yield from 1 ton of limestone?
~0.56 tons of quicklime → ~0.74 tons of hydrated lime → ~1 ton of PCC (theoretical; actual yields vary with process losses).
3. How does PCC compare to ground calcium carbonate (GCC)?
PCC offers superior purity, narrower particle distribution, and higher reactivity but at a higher production cost than mechanically ground GCC.
A project in Vietnam combined a 500 TPH aggregate line with a 200 TPD PCC module:
Integrating precipitated calcium carbonate processing into crushing/sand-making operations unlocks niche markets while optimizing resource utilization. Tailoring equipment selection—from kilns to classifiers—ensures profitability across construction and industrial sectors demanding high-purity mineral additives.
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