Agitating – Mortar mixer type – Methods
Patent
1976-02-18
1978-05-16
Aegerter, Richard E.
Agitating
Mortar mixer type
Methods
366 25, B28C 122
Patent
active
040895084
ABSTRACT:
A method of treating bituminous paving mixtures to reduce the amount of aggregate fines discharged into the atmosphere. Aggregate is fed into a charging end of an inclined drum mixer and is heated by a low-velocity gas stream to form steam from the moisture contained by the aggregate within a steam zone. Liquified asphalt is supplied to the aggregate in an asphalt injection zone as it moves downstream in the drum from the steam zone and coats the aggregate as it is tumbled and moved along the drum in a coating zone toward a discharge end. In the gas stream, the ratio of airflow into the drum mixer is accurately controlled with respect to the rate of fuel flow to a burner located at the charging end of the mixer, to consume during burner combustion all oxygen supplied by the airflow to produce a heated gas stream, thereby eliminating free oxygen from the interior of the drum mixer. The low-velocity heated gas stream travels through the drum and through the tumbling asphalt-coated aggregate in a lazy fashion toward a natural draft stack at the discharge end of the drum. The steam in the heated gas stream combines with tumbling coated aggregate during movement through the drum and assists in collecting aggregate fines in the final mix. The velocity of the gas stream is too low to entrain the aggregate fines in the gas stream as the latter rises through the stack. Thus, the fines settle on, adhere to and form a part of the asphalt coated aggregate.
The drum mixer has a deflector shield which is placed in the path of coated material flow adjacent the discharge end of the drum. The shield becomes sticky by the passage of the coated aggregate and attracts aggregate fines preventing their discharge from the stack.
REFERENCES:
patent: 2188798 (1940-01-01), Smith
patent: 2487887 (1949-11-01), McEachran
patent: 3674242 (1972-07-01), Stewart
patent: 3693945 (1972-09-01), Brock
patent: 3832201 (1974-08-01), Shearer
patent: 3840215 (1974-10-01), McConnaughay
patent: 3866888 (1975-02-01), Dydzyk
Aegerter Richard E.
Alliance Industries, Inc.
Shepperd John W.
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