Agitating – Mortar mixer type – Methods
Patent
1989-09-01
1990-04-03
Simone, Timothy F.
Agitating
Mortar mixer type
Methods
366 15, 366 25, 366 40, 432 14, 432105, B28C 546, B28C 122
Patent
active
049135520
ABSTRACT:
A drum mixer having an countercurrent flow drying zone and a parallel flow mixing zone is provided for producing an asphaltic composition. The drum mixer utilizes a heat source located at an intermediate position therein for generating three streams of hot gases. The first stream of hot gases is directed towards the receiving end of the drum mixer in a countercurrent direction to the flow virgin aggregate entering the drying zone of the drum mixer. Recycle material is introduced into the drum mixer between the heat source and the discharge end thereof. The recycle material and the heated virgin aggregate are combined within the mixing zone. As both materials travel towards the discharge end of the drum mixer the second stream of hot gases is directed towards the discharge end of the drum mixer in a parallel direction to the flow of the mixing materials for heating said materials. Liquid asphalt is mixed with the virgin aggregate and the recycle material in the mixing zone and the resulting asphaltic product is removed from the drum mixer at the discharge end. As the second stream of hot gases exits the discharge end of the drum, the flow of the second stream of hot gases is reversed creating a third stream of hot gases. The third stream of hot gases is returned to the heat source within the drum for burning hydrocarbon by-products produce during the operation of the drum mixer.
REFERENCES:
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patent: 4229109 (1980-10-01), Benson
patent: 4309113 (1982-01-01), Mendenhall
patent: 4398826 (1983-08-01), Mendenhall
patent: 4427376 (1984-01-01), Etnyre et al.
patent: 4462690 (1984-07-01), Wirtgen
patent: 4522498 (1985-06-01), Mendenhall
patent: 4787938 (1988-11-01), Hawkins
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