B - Operations – Transporting – 01 – F
Patent
B - Operations, Transporting
01
F
B01F 15/06 (2006.01) B28C 5/46 (2006.01) E01C 19/10 (2006.01) E01C 19/45 (2006.01) F26B 11/04 (2006.01)
Patent
CA 2243132
A drying and mixing plant is provided comprising a tapered inner drum and an oppositely tapered outer drum attached together concentrically and rotated as a unit. A burner directs a hot air stream into the small end of the inner drum. Material is fed into the small end of the inner drum, where impellers lift it and drop it into the hot air stream and move the material through the inner drum aided by the downward taper of the inner drum. The material exits the inner drum and enters the outer drum where an additive material is introduced and mixed with the material as both move through the chamber between the inner and outer drums to a material outlet. The receiving end of the outer drum is enclosed in a shroud, therefore the air stream is directed through the chamber between the drums, the chamber having an expanding cross section which slows the air down allowing fines to precipitate out. The device may include nozzles for spraying water across the path of the air stream and material flow, and further may include, for fluid additive materials, additive nozzles spraying the additive material across the path of the air and material. A third drum may be provided inside the inner drum, allowing separate addition of a third material, and further reducing fines in the air. The device is particularly suitable for mixing asphalt paving mix.
Furman & Kallio
Niemi Walter
Niew Industries Inc.
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