The Comprehensive Guide to Crushing and Sand-Making Plants in the Dry Mortar Industry
The global construction sector heavily relies on high-quality aggregates and manufactured sand (M-sand) as substitutes for natural sand, which faces depletion and environmental restrictions. Crushing and sand-making plants play a pivotal role in producing graded aggregates and fine powders essential for dry mortar, concrete, and other building materials. With urbanization accelerating, demand for efficient, eco-friendly crushing solutions has surged, driving innovation in equipment design and process optimization.
1. Primary Crushing:
– Jaw crushers or gyratory crushers reduce large rocks (>1m) to ~150mm. Harder materials may require hydraulic breakers or impact crushers.
2. Secondary/Tertiary Crushing:
– Cone crushers refine aggregates to 20–40mm for further processing. Multi-cylinder hydraulic models ensure uniform particle shape.
3. Sand-Making Stage:
– Vertical Shaft Impact (VSI) crushers are dominant, utilizing rock-on-rock or rock-on-iron principles to produce cubical M-sand (0–5mm). Air classifiers may remove excess fines (<75μm).
4. Powder Processing:
– For dry mortar, Raymond mills or ball mills grind limestone/gypsum into fine powder (200–400 mesh). Dust collectors (e.g., bag filters) mitigate emissions.
1. How to optimize fines content in M-sand?
Adjust VSI rotor speed and cascade flow; integrate a wet or dry screening system for precise control (±2% tolerance).
2. Which rocks are unsuitable for dry mortar sand?
Soft limestone or clay-rich aggregates may generate excessive fines; granite/basalt yield higher-strength outputs but wear crusher parts faster.
3. Key differences between natural and manufactured sand?
M-sand has angular particles enhancing mechanical interlock but requires polycarboxylate superplasticizers to maintain concrete flowability.
A 200tph plant combined a jaw crusher (PE600×900), multi-cylinder cone crusher (HPT300), and VSI ( B9100) to produce 0–4.75mm sand with <15% fines (+75μm). Powder milling utilized a MTW175 trapezoidal mill for 325mesh CaCO3 filler. The system achieved 92% utilization with IoT-based predictive maintenance reducing downtime by 30%.
Modern crushing/sand-making plants must balance output quality, energy efficiency, and adaptability to local material variations—key factors driving profitability in the dry mortar value chain. Advances in automation and material science continue to redefine industry standards, offering scalable solutions from small batch operations to mega-projects
Chat Online