The Comprehensive Guide to Crushing and Sand-Making in Aggregate Production
The global construction sector’s insatiable demand for high-quality aggregates has propelled the crushing and sand-making industry into a critical role. Natural sand depletion and environmental regulations have shifted focus to manufactured sand (M-Sand) and recycled materials, making optimized crushing plants indispensable. Wuhan, a hub for industrial innovation, exemplifies this trend with projects like mobile clinker ash reclamation plants, which repurpose waste into usable aggregates.
1. Primary Crushing:
– Jaw crushers or gyratory crushers reduce large rocks (>1m) to ~150mm. Key for hard materials like granite.
– Example: A Wuhan plant uses a PE900×1200 jaw crusher for clinker pre-crushing, achieving 90% efficiency.
2. Secondary/Tertiary Crushing:
– Cone crushers (e.g., HP300) or impact crushers refine material to ≤40mm. Vertical shaft impactors (VSIs) are pivotal for shaping cubical aggregates.
3. Sand-Making:
– VSI crushers or roller mills produce M-Sand with 0–5mm gradation. Modern systems integrate air classifiers to control fines (<75μm).
4. Mobile Solutions:
– Track-mounted plants (like LT1213) enable on-site processing for urban projects or clinker ash recycling, reducing transport costs by 30%.
A 200tph mobile plant processes cement kiln waste into:
Key metrics: 85% recovery rate, ROI in 2 years via reduced raw material procurement.
1. How to minimize dust in sand-making?
– Use wet suppression systems or enclosed VSIs with bag filters (PM2.5 <10mg/m³).
2. Mobile vs stationary plants?
– Mobile suits short-term projects (<3 years); stationary offers higher output (500tph+).
3. Clinker ash challenges?
– High abrasiveness demands Mn-steel wear parts; pre-screening removes unburned residues.
4. Optimal gradation for concrete sand?
– Aim for fineness modulus of 2.6–3.0 with <15% passing 150μm sieve.
By integrating advanced crushing tech with circular economy principles—like Wuhan’s clinker ash projects—the industry can balance profitability and sustainability seamlessly.
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