| 摘要 |
The present invention pertains to a system and a method for recovering salvageable ferrous and non-ferrous materials from incinerated waste materials including friable, carbonaceous incineration byproducts such as ash and associated ferrous and non-ferrous metal components. The system includes at least one crushing means for selectively comminuting friable material comprised of a rotating roll having at least one protrusion, preferably a weld extending transversely to the direction of rotation of roll, on its exterior cylindrical surfaces in spaced relation to a backing plate. The backing plate is urged toward the roll by a bias means exerted a preferably adjustable pressure sufficient to comminute the friable carbonaceous material to a desired size, and insufficient so as to permit the backing plate to retract and allow passage of ferrous and non-ferrous components in the waste material through the crushing means substantially uncomminuted. The bias means tends to rapidly urge the retracted backing plate to its set position and exert a selective comminution pressure through the retraction cycle. At last a first separating means coacts with the first crushing means for at least partially separating comminuted carbonaceous incineration byproducts from ferrous and non-ferrous metal components; and first magnetic means separates ferrous metal components from the waste material. The present invention further relates to a novel crusher for selectively comminuting friable materials without substantially comminuting associated malleable materials.
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