建設・建築廃材リサイクル

Construction & Demolition Recycling Construction Waste Recycling Equipment

The construction industry is moving away from the "build-demolish-dump" cycle and toward Urban Mining. At the heart of this shift is the Mobile Stone Crusher, a powerhouse designed to turn piles of jagged concrete and brick into high-quality recycled aggregate right on the job site.

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## 1. The Engineering Logic: From Waste to Wealth

In a traditional setup, demolition waste is hauled to a landfill—a process that is expensive, carbon-heavy, and wasteful. A mobile crusher flips the script. It brings the factory to the waste. By processing materials on-site, contractors save on transport costs and produce "Road Base" or "Sub-base" materials immediately.

### Key Components of a Mobile C&D Plant:

* Vibrating Feeder: Uses a "Grizzly" bar system to pre-screen fines (dirt/sand) so the crusher only works on the big stuff.
* Crushing Unit: Usually a Jaw Crusher (for primary compression) or an Impact Crusher (for better grain shape and higher reduction ratios).
* Magnetic Separator: This is the "secret sauce" for C&D waste. It pulls out rebar and scrap metal that would otherwise contaminate the recycled aggregate.
* Discharge Conveyor: Transports the finished product to a stockpile.

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## 2. Technical Specifications & Performance

When evaluating these machines, "Throughput" ($TPH$ or Tons Per Hour) is the metric that matters. For C&D recycling, the machine must handle unpredictable feed sizes and varied material hardness.

### Typical Technical Specifications Table

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| Feature | Specification Range | Why it matters |
| --- | --- | --- |
| Throughput | 100 – 500 $t/h$ | Determines project timeline efficiency. |
| Max Feed Size | 500mm – 1,100mm | Dictates if you need a hydraulic breaker first. |
| Power Source | Diesel-Electric or Hydraulic | Dual power (Electric) is better for urban noise/emissions. |
| Crusher Type | Jaw or Impact | Impactors provide a more "cubic" final product. |
| Mobility | Crawler Tracks | Essential for moving over uneven rubble piles. |

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## 3. The "C&D" Specialization

Recycling construction waste isn't just about "breaking rocks." It’s about cleaning material. Modern mobile units are equipped with:

1. Over-belt Magnets: Specifically designed to lift heavy steel reinforcement bars (rebar) out of the crushed concrete flow.
2. Dust Suppression: High-pressure misting systems to keep neighbors happy and workers healthy in tight urban environments.
3. Active Pre-screening: Removing sticky soil or asphalt fines before they enter the crushing chamber to prevent "plugging."

> The Insight: Using a mobile crusher can reduce project carbon footprints by up to 40% simply by eliminating the "truck-in, truck-out" logistics of aggregate management.

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## 4. Maintenance and Longevity

Because C&D waste is highly abrasive (and often contains "surprises" like wood or plastic), maintenance is non-negotiable.

* Jaw Plates: Must be flipped or replaced regularly to maintain the "Closed Side Setting" (CSS), which determines the size of your output.
* Blow Bars: In impact crushers, these are the high-wear items that take the brunt of the force.

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Would you like me to compare the cost-effectiveness of Jaw vs. Impact crushers for a specific type of demolition project, or perhaps look into the environmental regulations regarding on-site crushing?