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Specialized Recycling Systems for Demolition Debris

Tue February 21, 2012 - National Edition
Construction Equipment Guide

Recycling C&D (construction and demolition) debris requires all the equipment normally needed for recycling concrete and asphalt rubble, plus other specialized elements in the system to handle such incoming items as wood, asphalt shingles, drywall, plaster, plastic, steel, paper, dirt and electrical wire.

A concrete recycling system generally consists of a primary impact crusher, side discharge conveyor, screening plant, return conveyor and radial stacking conveyors. A C&D system typically also will include picking stations to remove many of the unwanted materials by hand. Other important options can include a wood shredder, a low-maintenance air sorting tower to segregate paper and wood from stone, an electromagnetic separator to remove ferrous metals, and water-based dust suppression at locations such as the feed hopper, screening plan and fines conveyor to minimize emissions.

The heart of all concrete/asphalt and C&D recycling systems is the crusher, which needs to be a primary impactor.

To handle the variety of materials coming through a C&D recycling operation, the screen plant should be a wet or dry, triple deck, horizontal or inclined type. The electromagnetic separator should be mounted in-line, rather than perpendicular, at the top of the side discharge conveyor to assure smooth material flow. The separator’s head pulley and splitter should be stainless steel, which cannot become magnetized.

Grasan, of Mansfield, Ohio, produces C&D recycling systems. All Grasan plants utilize Hazemag 1315 or 1515 primary impact crushers with hydraulic controls for more uniform products and 15 to 20 percent greater production than same-size impactors with standard controls, according to the manufacturer.

Road-portable Grasan impact crushing plants are equipped with a skid-on, skid-off hopper and six independent hydraulic legs that provide complete operational support and infinite height and leveling adjustments. The crushing plant, screen plant and conveyors can all be set up in one day without crane assist.

For more information, call 419/526-4440 or visit

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