EP2148004B1 - Method for producing asphalt - Google Patents

Description

The invention relates to a process for the production of asphalt in which white material and used asphalt granulate are further processed.

Processes for the production of asphalt are based on the heating of rock material, so-called white material, as well as the admixture of additives. From the DE 40 35 050 C2 For example, a method for producing asphalt mixtures is known wherein a heated batch is transported from an asphalt factory to a satellite factory where it is mixed with melted asphalt to form an asphalt mixture. From the EP 0 641 886 A2 For example, a conditioning drum for heating rock material and granulated expansion asphalt is known, and with the conditioning drum, a large amount of granulated expansion asphalt can be easily and inexpensively heated and added to the new rock material. Other methods and apparatus for the production of asphalt are known from WO 2007/103345 A2 , of the US 6,196,710 B1 , of the US 4,867,572 and the US 4,600,379 A known.

The document WO 2007/103345 A2 discloses a method having the features of the preamble of claim 1

The invention is based on the object to provide a process for the production of asphalt, wherein the adhesion of fine-grained Altasphaltgranulat is prevented.

The object is solved by the features of claim 1. The essence of the invention is to apply in a process for the production of asphalt by further processing of white material and Altasphaltgranulat the Altasphaltgranulat before reaching a further processing station with a filler. Further processing stations may be a drying drum, a granulate drying drum, serve a mixer or a hot-elevator. As a filler dust is preferably used, which is sticky due to adhesion asphalt granules converts into a relatively dry and free-flowing material surface. This effect is also referred to as a so-called breading effect. The filler used for this is present as a product of dedusting, which is part of an asphalt mixing plant, the filler being divided into coarse fillers and fine fillers due to its particle size. Furthermore, the filler can also be used as an externally produced product for the application of Altasphaltgranulates.

Further advantageous embodiments of the invention will become apparent from the dependent claims.

Fig. 1 bis Fig. 5

schematische Darstellungen erfindungsgemäßer Anlagen zur Herstellung von Asphalt gemäß fünf Ausführungsbeispielen.

Additional features and details of the invention will become apparent from the following description of five embodiments with reference to the drawing. Show it:

Fig. 1 to Fig. 5

schematic representations of inventive plants for the production of asphalt according to five embodiments.

An in Fig. 1 shown plant 1 has a drying drum 4, to which an insertion belt 9 is arranged. Furthermore, a spinning belt 6 is provided in a discharge area 7 of the drying drum 4. A Heißelevator 10 is connected directly to the outlet region 7 of the drying drum 4. A dust silo 11 is connected via a tube screw 5 with the spinner belt 6. In the plant 1, a continuous heating of Altasphaltgranulat 2 takes place, wherein a filler 3 is also continuously fed to the Altasphaltgranulat 2 before a heating process in the drying drum 4. The filler 3 is available as a product of dedusting, which is designed as a filter, in the dust silo 11 available. The Feeding of the filler 3 to the Altasphaltgranulat 2 via the tube screw 5 and can also be done on all known and appropriate conveyor devices such as conveyors, vibrators or pneumatic conveyors. The applied with the filler 3 Altasphaltgranulat 2 is fed via the spinner belt 6 in the outlet region 7 of the drying drum 4 a white material 8. The white material 8 is transported via the throw-in belt 9 into the drying drum 4. In the drying drum 4, a heating of the white material 8 and the Altasphaltgranulates 2 and a mixing of the white material 8 with the Altasphaltgranulat 2 takes place simultaneously. A heated and from the acted upon with the filler 3 Altasphaltgranulat 2 and the white material 8 mass is mixed over the outlet region 7 of Drying drum 4 transported in the heat elevator 10.

The following is with reference to Fig. 2 a second embodiment of the invention described. Structurally identical parts are given the same reference numerals as in the first embodiment, to the description of which reference is hereby made. The essential difference with respect to the first exemplary embodiment is that an addition belt 12 is arranged in a middle region of the drying drum 4. Furthermore, the dust silo 11 via the tube screw 5, a Füllerelevator 13 and an additional ring 14 with the drying drum 4 is connected. In contrast to the first embodiment of the filler 3 is fed via the tube screw 5 and the filler 13 to the Altasphaltgranulat 2. The applied with the filler 3 Altasphaltgranulat 2 is transported via, and via the addition ring 14 in the drying drum 4. There is continuous heating and mixing of the white material 8 and the Altasphaltgranulat 2 in the drying drum 4. Subsequently This heated, mixed mass is transported in the heat elevator 10 on.

The following is with reference to Fig. 3 A third embodiment of the invention described. Structurally identical parts are given the same reference numerals as in the first two embodiments, to the description of which reference is hereby made. The main difference with respect to the first two embodiments is that the addition belt 12 is connected directly to an old asphalt granulate elevator 16, at the output of which a granulate drying drum 15 connects. The granulate drying drum 15 is arranged in addition to the drying drum 4 in the system 1 and is also referred to as a parallel drum .. The Altasphaltgranulat 2 is applied to the filler 3 via the tube screw 5 and the addition belt 12 and the Altasphaltgranulat-Elevator 16th the granule drying drum 15 fed. The continuous heating of the white material 8 takes place in the drying drum 4, the continuous heating of Altasphaltgranulates 2 in the granular drying drum 15. In contrast to the supply of white material 8 in the drying drum 4 is carried out in the granules drying drum 15, the addition of Altasphaltgranulates 2 not at the point which has the greatest distance to a burner of the granule drying drum 15, but at the point at which the burner of the granular drying drum 15 is installed. The reason for this is a relatively higher likelihood of ignition of the scrap asphalt granules 2 relative to that of the white material 8, so that the scrap asphalt granules 2 come into contact with the burner of the granule drying drum 15 in a cold and moist initial state and not in a dried state.

The following is with reference to Fig. 4 A fourth embodiment of the invention is described. Structurally identical parts receive the same reference numerals as in the first three embodiments, the description of which reference is hereby made. The main difference compared to the first three embodiments is that the Altasphaltgranulat 2 supplied without prior heating in the drying drum 4 or the granulate drying drum 15 in a cold and wet starting condition the dried white material 8 directly in the heat-elevating furnace 10 and heated there continuously and dried becomes. The application of the Altasphaltgranulats 2 with the filler 3 via the tube screw 5 directly before the supply of Altasphaltgranulates 2 in the Heißelevator 10th

The following is with reference to Fig. 5 A fifth embodiment of the invention is described. Structurally identical parts receive the same reference numerals as in the first four embodiments, the description of which reference is hereby made. At a feed of a Altasphaltgranulat-Elevators 16, the addition band 12 is arranged. A belt scale 17 and a chute 18 connect the Altasphaltgranulat-Elevator 16 with a mixer 19. The main difference compared to the first four embodiments is that the heating of Altasphaltgranulates 2 is discontinuous. For this purpose, the filler 3 is added in a quantity corresponding to the asphalt formulation via the tube screw 5 to the used asphalt granulate 2. The applied with the filler 3 Altasphaltgranulat 2 is transported via the addition of belt 12 and the Altasphaltgranulat-Elevator 16 on the belt scale 17, where that is weighed with the filler 3 applied Altasphaltgranulat 2. About the chute 18, the cold Altasphaltgranulat 2 is in the mixer 19, in which superheated white material 8 is transported.

Altasphaltgranulat 2 is obtained by milling old road surfaces. Depending on the Abfräsverfahrens used, the size of the particle diameter vary, with fine-grained Altasphaltgranulat 2 by particle diameter less than 10 mm, in particular less than 5 mm and in particular less than 2 mm is characterized.

The filler 3 produced in the dedusting has particles with diameters between 0.9 mm and 2.0 mm, in particular 1.5 mm to 2.0 mm and is therefore referred to as coarse filler. Coarse filler is particularly advantageous for the application of the Altasphaltgranulates 2, since the coarse filler is present as a product of dedusting heated and thus the combination of Altasphaltgranulat 2 is favored with the coarse filler. The application of the Altasphaltgranulates 2 is also with so-called fine filler, which is characterized by particle diameter between 0 mm and 0.9 mm, in particular 0.1 mm to 0.9 mm, in particular 0.5 mm to 0.9 mm, possible. Depending on the country specification, the separation between the fine filler and the coarse filler may be 0.63 mm or 0.63 mm instead of 0.9 mm.

The asphalt production process of the present invention is based on the addition of used asphaltic granulate 2 to white material 8, can be used for many known methods of heating asphalted asphalt granules 2, and is designed so that existing asphalt production processes and equipment that facilitate the addition of asphalt Altasphaltgranulat 2 do not take into account, can be operated by adding appropriate components according to the new method.

Claims (14)

1. Method for the production of asphalt comprising:

   - heating white material (8) and old asphalt granulate (2),

   - mixing the white material (8) with the old asphalt granulate (2) and

   - charging the old asphalt granulate (2) with a filler (3) prior to reaching a station for further processing,

   characterised in that

   - prior to heating the cold old asphalt granulate (2) is charged with a previously weighed amount of filler (3).
2. Method according to claim 1, characterised in that the white material (8) and the old asphalt granulate (2) is heated in two separate containers (4, 15).
3. Method according to claim 1, characterised in that the white material (8) and the old asphalt granulate (2) are heated in a common container (4).
4. Method according to any of claims 1 to 3, characterised in that the old asphalt granulate (2) has a particle diameter of less than 10 mm, in particular less than 5 mm and in particular less than 2 mm.
5. Method according to any of claims 1 to 4, characterised in that the old asphalt granulate (2) is heated continuously.
6. Method according to claim 5, characterised in that the continuously heated old asphalt granulate (2) is charged with the filler (3) continuously.
7. Method according to any of claims 1 to 4, characterised in that the old asphalt granulate (2) is heated discontinuously.
8. Method according to any of claims 1 to 7, characterised in that dust is used as the filler (3), which by adhering to the old asphalt granulate (2) wets its adhesive surface so that the surface of the old asphalt granulate (2) wet with dust is pourable.
9. Method according to any of claims 1 to 8, characterised in that the filler (3) is a fine filler with a particle diameter of between 0 mm and 0.9 mm, in particular 0.1 mm to 0.9 mm, in particular 0.5 mm to 0.9 mm or a coarse filler with a particle diameter of between 0.9 mm and 2.0 mm, in particular 1.5 mm to 2.0 mm.
10. Method according to any of claims 1 to 9, characterised in that the filler (3) is product of dust extraction in a facility (1) for the production of asphalt.
11. Method according to any of claims 1 to 10, characterised in that the old asphalt granulate (2) is granulated recycled asphalt which is produced by milling old road surfaces.
12. Method according to any of claims 1 to 11, characterised in that the white material (8) is a rock material for the production of asphalt.
13. Method according to any of claims 1 to 13, characterised in that the white material (8) and the old asphalt granulate (2) are transported between stations for further processing.
14. Method according to claim 13, characterised in that stations for further processing include a dryer drum (4), a granulate dryer drum (15), a mixer (19) or a hot elevator (10).

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