In a process for producing asphalt-aggregate composition in which used asphaltic concrete is recycled by being heated and mixed in a rotatable drum into which flame and hot gases of combustion are directed, the improvement comprises introducing virgin aggregate in a hot zone of the drum and directly exposing the aggregate to the flame and/or hot gases of combustion, and introducing particles of asphalt-aggregate composition downstream from the hot drum input end, away from direct exposure to the flame and extremely hot gases, in a cooler temperature zone. An improved apparatus includes means for introducing the aggregate at the input drum end for direct exposure to the flame or hot-test gases, and means for introducing the used and recycled asphalt-aggregate composition in a cooler drum zone.
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7. A process for producing asphalt-aggregate composition continuously recycling used asphaltic concrete comprising
continuously introducing only non-asphalt containing virgin aggregate particles in a hot temperature zone of a rotatable drum, gradually heating said particles and rotating said drum to advance said particles toward an output drum end, continuously introducing only a mixture of coarse and fine solid particles of used asphaltic concrete comprising a mixture of asphalt and aggregate in said drum at a single location in a cooler temperature zone, and gradually mixing and heating said aggregate particles with said asphaltic concrete.
1. A process for producing asphalt-aggregate composition continuously recycling used asphaltic concrete comprising
continuously introducing only non-asphalt containing aggregate particles in a hot zone of a rotatable drum and gradually heating and advancing said aggregate toward an output drum end, continuously introducing only a mixture of coarse and fine solid particles of used asphaltic concrete comprising a mixture of asphalt and aggregate radially into said drum downstream from said hot zone at a single location in a cooler temperature zone, gradually mixing and heating said aggregate with said asphaltic concrete particles, and adding and mixing liquid asphalt with said the mixture of aggregate and asphaltic concrete particles downstream from said hot zone to produce said asphalt-aggregate an asphaltic concrete paving composition.
2. In a process for producing an asphalt-aggregate paving composition by heating and mixing non-asphalt containing aggregate particles in a rotating drum into which hot gases of combustion are directed for said heating while gradually drawing said particles from an input drum end to an output end, and mixing liquid asphalt with said particles to produce said composition, the improvement comprising introducing only said non-asphalt containing aggregate particles at said drum input end, said particles being exposed to said gases in a hot temperature zone, and introducing only a mixture of coarse and fine solid particles of used asphaltic concrete comprising a mixture of asphalt and aggregate in said drum at a single location in one or more a cooler temperature zones prior to mixing said liquid asphalt.
6. The process of
8. The process of
9. The process of
10. The process of
11. The process of
12. The process of
directing a flame and hot gases of combustion into said hot zone of said drum, and rotating said drum whereby said non-asphalt containing aggregate particles cascade in said hot zone to form a shield from said flame for said used asphaltic concrete particles in said cooler zone.
13. The process of
15. The process of
17. The process of
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This application is a continuation-in-part of applicant's co-pending Ser. No. 718,063, filed Aug. 26, 1976radientproduce product, as described in my U.S. Pat. No. 4,000,000. This flexibility of the process and apparatus as well as other modifications and advantages thereof within the purview of the invention will be evident to those skilled in the art.
Patent | Priority | Assignee | Title |
10080987, | Feb 26 2014 | Crowley Chemical Company, Inc. | High recycle/reclaimed asphalt hot mix asphalt system and gas treatment process |
10995990, | Dec 22 2015 | K S PREMIER PRODUCTS CO , LTD | Rotary dryer with multi-drying chambers |
4867572, | Sep 08 1987 | AI ENTERPRISES, INC | Asphalt plant with fixed sleeve mixer |
4910540, | May 12 1989 | CMI Corporation; CMI CORPORATION, A CORP OF OKLAHOMA | Countercurrent asphalt drum dryer/mixer |
4921730, | Aug 21 1987 | Taisei Road Construction Co., Ltd. | Method of producing a recycled asphalt mixture |
5073030, | Jan 25 1990 | TARMAC EQUIPMENT COMPANY, P O BOX 414590, KANSAS CITY, MO A MO CORP | Drum apparatus for mixing asphalt compositions |
5470146, | Jun 30 1986 | Terex USA, LLC | Countercurrent drum mixer asphalt plant |
5513443, | Jan 13 1995 | Asphalt Drum Mixers, Inc.; ASPHALT DRUM MIXERS, INC | Dryer for aggregate and reclaimed asphalt products |
5538340, | Dec 14 1993 | GENCOR INDUSTRIES, INC | Counterflow drum mixer for making asphaltic concrete and methods of operation |
5730591, | Apr 12 1993 | FIVES NORTH AMERICAN COMBUSTION, INC | Method and apparatus for aggregate treatment |
6267493, | Jun 02 1999 | CMI Corporation | Drum mixer having a plurality of isolated aggregate transport channels |
6340240, | Jun 02 1999 | CMI ROADBUILDING LTD | Drum mixer having isolated aggregate transport channels |
RE39289, | Feb 09 1999 | TUKWADT SCHWOOMP, LLC | Apparatus and process for manufacturing asphalt |
Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Dec 05 1991 | CMI CORPORATION A CORP OF OKLAHOMA | CONGRESS FINANCIAL CORPORATION SOUTHWEST A CORP OF TEXAS | SECURITY INTEREST SEE DOCUMENT FOR DETAILS | 005984 | /0346 |
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