Datong Economic and Technological Development Zone Construction Waste Recycling Project

Datong Economic and Technological Development Zone Construction Waste Recycling Project

I. Project Background

As a traditional resource-based city undergoing urban renewal, Datong generates over 2 million tons of construction waste annually. The previous disposal method (open stacking + simple landfilling) resulted in low resource utilization (<25%), land occupation, and serious dust pollution. To fill the city's construction waste disposal gap and build an environmentally friendly society, this project was initiated to establish a large-scale, intelligent recycling base for both C&D waste and decoration waste.

II. Technical Parameters and Configuration

The system adopts a "bag tearing + screening + air separation + crushing + graded screening" process.

ParameterValue

Site Area76,000 m²

Total Investment~220 million RMB

Annual Capacity1.0 million tons (800 kt C&D waste + 200 kt decoration waste)

Annual OutputAggregates: 0-5mm (350 kt), 5-10mm (250 kt), 10-20mm (200 kt), 20-31.5mm (100 kt); Cement-stabilized macadam: 300 kt; Permeable bricks/blocks: 100 kt (~200,000 m²)

Key Equipment:

EquipmentSpecificationQty

Bag tearing machine80 t/h2

Heavy bar feeder≤800mm feed4

Jaw crusherPEV1100×750, 200 t/h2

Impact crusherPFW1315III, output ≤40mm2

Circular vibrating screen3 decks (5/10/20mm)4

Trommel screen60/30mm interchangeable2

Air separator100 t/h, efficiency ≥92%3

Magnetic separatorRCYD-124

Manual sorting platform4 stations2

Pulse bag filter80,000 m³/h, emission ≤10mg/m³3

Process Flow:

C&D waste: Feeding → coarse screening (soil removal) → jaw crushing → magnetic separation → impact crushing → air separation → graded screening → aggregates

Decoration waste: Bag tearing → trommel screening → air separation → manual sorting → crushing → screening → aggregates

Control System: DCS with centralized monitoring, auto load adjustment, fault diagnosis, interlock protection, and remote O&M interface.

Safety & Environmental Devices:

Enclosed building + negative pressure dust collection + spray system

Belt emergency pull cords + anti-deviation switches

Metal detector (prevents crusher damage)

Level monitoring + anti-blocking protection

Crusher sound enclosure + green belt noise reduction

III. Implementation Plan

3.1 Foundation and Mechanical Installation

Steel structure main workshop (approx. 20,000 m²) + office building (3,000 m²)

Concrete foundations with vibration isolators

Installation precision: crusher spindle horizontal error ≤0.15 mm/m; belt deviation ≤5 mm; trommel screen levelness ≤0.5 mm/m

3.2 Electrical and Control System Commissioning

Shielded cables + fiber optic ring network

DCS programming: crusher gap, screen size, air separator speed

Safety interlock test: response time ≤1 second

Interface with environmental monitoring platform for real-time emission data reporting

3.3 Trial Operation and Optimization

No-load test: 4 hours continuous; bearing temp rise ≤45°C; vibration ≤4.5 mm/s

Load test: Gradual loading 25% → 50% → 75% → 100%

Test C&D and decoration waste lines separately

Monitor: capacity, crusher current, screening efficiency (≥88%), air separation efficiency (≥92%)

Target product impurity rate ≤0.5%; final aggregates meet GB/T 25177 and GB/T 25176 standards

IV. Results

4.1 Resource Utilization

Utilization rate increased from <25% to >90%

Annual aggregate output: ~900 kt (four gradations)

Cement-stabilized macadam: 300 kt/year (for road base)

Permeable bricks/blocks: 100 kt/year (for sponge city construction)

Natural sand/gravel saved: ~850 kt/year

4.2 Environmental and Social Benefits

MetricResult

Fugitive dust≤0.5 mg/m³ (meets Shanxi standard)

Light material removal≥92%

Land saved~100 mu/year

CO₂ reduction~35,000 tons/year

Jobs created~60

Social valueFills Datong's disposal gap for next 10 years

Zero environmental penalties or major accidents since commissioning

Safety devices triggered successfully 20+ times (anti-blocking, overload, emergency stop, etc.)

4.3 Economic Benefits

MetricValue

Unit energy consumption≤5.8 kWh/ton

Annual revenue (disposal fees + product sales)~110 million RMB

Annual operating cost~65 million RMB

Annual net profit~38 million RMB

Payback period~5.8 years

Additional revenue includes government disposal subsidies.

Conclusion: This project demonstrates that a "bag tearing + screening + air separation + crushing + graded screening" system with DCS control and comprehensive environmental/safety features can achieve >90% resource utilization of mixed C&D and decoration waste. It provides a scalable model for resource-based cities undergoing transition.