A qualified aggregate crushing & screening system is the core of quarry and construction sand projects. Many investors blindly select single crushers without matching screening and conveying equipment, resulting in unqualified particle shape, unstable output, high wear cost and inconsistent finished gradation. This article introduces the full workflow, classic equipment combinations and selection principles for aggregate production lines, covering both stationary and mobile solutions.
Full Aggregate Production Flow
Raw stone → Feeding → Primary crushing → Secondary crushing → Tertiary shaping (optional) → Vibrating screening → Finished aggregate stockpiling → Dust collection & wastewater treatment
- Feeding: Vibrating Feeder Uniformly feed raw rocks into primary crusher; pre-screen soil and fine impurities to improve crushing efficiency and reduce wear.
- Primary Crushing: Jaw Crusher Handle large raw stone (300–800mm). Jaw crusher is standard for coarse crushing, good for hard granite, basalt, limestone, low maintenance cost.
- Secondary Crushing: Cone Crusher / Impact Crusher Cone crusher for high-hardness rock; impact crusher for medium soft stone (limestone), better flakiness reduction.
- Tertiary Shaping: Vertical Shaft Impact Crusher (VSI) Optional stage to reshape aggregates, reduce needle & flaky particles for high-grade concrete aggregate.
- Vibrating Screen Classify crushed materials into multiple sizes: 0–5mm, 5–10mm,10–20mm,20–31.5mm. Multi-deck screen for multi-grade finished products.
- Belt Conveyor Connect each unit, transport material between crushers and screens; sealed type to reduce dust emission.
- Auxiliary System: Dust Collector & Control Cabinet Bag dust collector for environmental compliance; centralized PLC control for automatic operation.
3 Classic Equipment Combinations
| Combination | Equipment List | Suitable Raw Material | Typical Capacity |
|---|---|---|---|
| Simple 2-stage Stationary Line | Vibrating feeder + Jaw crusher + Impact crusher + 2-deck vibrating screen + Belt conveyors | Medium soft rock: limestone, dolomite | 50–150TPH |
| Hard Rock 3-stage Line | Feeder + Jaw + Cone + VSI shaper + Multi-deck screen | Granite, basalt, quartzite | 100–400TPH |
| Mobile Crushing & Screening Plant | Mobile jaw unit + mobile cone/impact unit + mobile screening unit | Flexible quarry, temporary site, frequent relocation | 30–250TPH |
Key Index to Evaluate Aggregate Quality
- Particle shape: Needle & flaky content should be controlled below 10~15% for high-standard concrete aggregate.
- Gradation: Well graded, continuous size distribution, avoid oversize or excessive fine powder.
- Content of soil & impurities: Mud content ≤3% for construction aggregate.
- Compressive strength: Match project requirement for road, bridge or concrete batching plant.
FAQ
Cone crusher is for hard rock, low wear cost; impact crusher produces better particle shape but higher wear when crushing abrasive hard stone.
Stationary line suits long-term fixed quarry, larger capacity and lower unit operating cost. Mobile plant fits short-term projects, mountain road construction, frequent site moving.
Adopt bag dust collector, sealed conveyor transfer points, water spraying system. This meets local environmental protection requirements.
Yes, add VSI sand maker and sand washing machine to get 0-5mm manufactured sand together with crushed stone aggregate.
Investment Advice for Aggregate Plant Owners
Before purchasing equipment, test raw rock hardness, abrasion index and required finished aggregate specifications. Many investors save budget on screening system, which causes repeated re-crushing and low qualified product rate. Reasonable equipment combination and automatic control can cut operational cost and improve finished aggregate quality.
Get Custom Aggregate Crushing & Screening Layout
Tell us your raw stone type, target capacity and finished sizes. WSHT engineers provide flow chart, equipment list and site layout drawing.
