Classifying – separating – and assorting solids – With heat treatment
Patent
1997-08-20
2000-09-05
Walsh, Donald P.
Classifying, separating, and assorting solids
With heat treatment
209577, 209639, 1984612, B03B 100, B07B 500, B07C 4731
Patent
active
061129038
ABSTRACT:
A stream of mixed particulates of two or more materials having different induction heating characteristics (i.e., distinct thermal, dielectric strength and/or loss tangent characteristics), such as recycled glass cullet including fragments of glass mixed with fragments of glass-like contaminants such as ceramics, pyroceramics, tempered glass or the like, is sorted using the differing characteristics of the glass and contaminants to cause detectable differences in temperature. A thick heating layer many particles deep is formed on a conveyor path for heating the stream in a compact mass for uniform heating. An electromagnetic induction heater applies microwave energy between 0.915 and 2.45 GHz for heating the mass, which is then spread into a thin detecting layer, for example one particle deep, on a further conveyor. The detecting layer is digitally imaged using a thermal camera. The thermal image data is analyzed for temperature differences, particularly for temperature differences from an average temperature computed for discrete lateral lanes. A downstream diverter mechanism is triggered to divert incremental portions of the material stream found to contain temperature differences, thereby removing the contaminants.
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Hawk Neal A.
Kimmel Kevin S.
Eftek Corporation
Martin Brett C.
Walsh Donald P.
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