DE2656117C2 - Method and device for the regeneration of road asphalt waste - Google Patents

Description

2. The method according to claim 1, characterized in that dividing the aggregate granules or elements into a predetermined number of particle size groups sorted.

3. The method according to claim 1, characterized in that prior to entering the asphalt waste in the water a mixture of about 80 to 95% active clay or active soil and about 20 to about 5% activated carbon in the '.n the container Brings in water.

4. Device for performing the method according to claims 1 to 3, characterized by a container (4) for receiving water up to a predetermined level X; means (1, 2, 3) for introducing steam into the water to be heated present in the container; and a device for mechanical separation (6 and / or 8) of the steam-heated and softened asphalt waste in the water (Fig. 1).

5. Apparatus according to claim 4, characterized in that the means for introducing Steam includes steam pipes (3), some of which are provided with a plurality of openings through which the steam can be introduced into the water (Fig-1) -

6. Apparatus according to claim 5, characterized in that it includes means for promoting the Granules or elements that are heated and softened by separating or dividing the heated Asphalt waste is formed in the water, and means (11) for sorting the granules and Having elements in a predetermined number of particle size groups (Fig. 1).

60

The invention relates to a method and a device for the regeneration of road asphalt waste by treating the asphalt waste with water, heating and crushing the asphalt waste.

In the case of the renewal of road surfaces, the asphalt usually used for road construction, which is generated as waste, is usually discarded. The removal of this asphalt waste not only leads to economic losses, but also pollution. Furthermore, the transport of the waste causes considerable expenditure of time and money. Also for reasons of the global raw material crisis, the disposal of this asphalt waste is considered undesirable to watch.

Therefore, there has been a need for recovery or recycling of asphalt for a long time. the Recyclization or regeneration processes proposed so far consist in using the asphalt waste high frequency waves or heat directly with the flame; treating them with steam; them indirectly with to heat a highly heated oil; and / or crushing them. Neither of these procedures is different Reasons, for example a low profitability or a reduction in quality, economical satisfactory

The FR-PS 8 25 325 describes a method for the reconditioning of bituminous road surfaces on the basis of asphalt and tar binders, according to which the road leaf waste is crushed, heaped up, sprinkled with a small amount of water and set for a suitable period of time Temperature to cause a separation of the material, whereupon this in this way treated material is transferred to a mixing device, where fresh road paving components are added and is mixed.

From US-PS 5 05 416 is a process for extracting and refining natural asphalt from the accompanying mineral carrier materials known, in the case of which is also used in the extraction of natural products volatile oils contained in the heating of the asphalt raw materials takes place in water by the introduction of steam, which has the consequence that the low melting point and partly volatile organic components detach themselves from the mineral constituents and float up.

The subject of US-PS 24 13 9Gtf is a device for processing asphalt waste with which the crushed asphalt waste is ^{heated directly with steam to a relatively high temperature of 149 °} C., after which the material processed in this way with further bituminous material and additional components must be mixed before it can be used again to form a road surface. Because of this fact, this previously known teaching is unsatisfactory as a method for regenerating road asphalt waste.

The object of the present invention is therefore to provide a method and a device for regeneration of road asphalt waste that is suitable for practical use and does not cause any impairment the quality of the asphalt and make it possible to use the regenerated road asphalt waste without Use another to create a road surface / 11.

This object is now achieved by the characterizing features of the method according to the main claim. The subclaims relate to particularly preferred embodiments of this subject matter of the invention and a device for performing this method.

The invention therefore relates to a method for regenerating road asphalt waste by treatment the asphalt waste with water, heating and crushing the asphalt waste, which is characterized is. that he

- VGi-lying water in a container by introducing it heated by steam;

- the asphalt waste in the one present in the container enters hot water;

- The asphalt waste in the water by introducing steam into the What ^c he heated under atmospheric pressure to a temperature of about 80 ° to 100 ⁰ C; and

- those brought into the water, heated and softened Asphalt waste is separated from each other with the help of a mechanical separator Aggregate granules or elements, the surfaces of which are covered with a thin layer of bitumen are, separates

The invention also relates to a device for carrying out this method, which is characterized by a container for holding water up to a predetermined level; a device for introducing steam into the water to be heated present in the container; and a device for mechanical separation of d <-s heated and softened asphalt waste in the water by the steam.

According to the invention, steam is introduced into water, in order to regenerate the previously discarded asphalt waste, which resulted in a remarkable improvement Treatment effects can be achieved. One of the essential features of the present invention is therein to see that steam is injected into water, thereby heating the asphalt waste in the presence of water will.

According to the invention, the asphalt wastes are both during heating and during their separation or breakdown or breakdown contained in the water. This is also an essential feature the invention. The use of steam is also essential to the invention, the intended one However, the effect is only achieved if the steam is used in combination with water. Therefore is based the method according to the invention on a principle that is fundamentally different from the previously known Regeneration system in which the asphalt waste is exposed to a steam atmosphere and thus heated will. Although various heating media are known, according to the invention, steam is used with higher Temperature used to heat the asphalt waste present in the water.

With the method according to the invention, the asphalt waste can be regenerated or processed in the state how they are removed from the tarred and renewed road surface. With others Sorting or washing of the waste pieces is not necessary. This represents a significant one This is an advantage in practice. When the material from the regeneration treatment is sorted or washed must be, result in a considerable expenditure of time and high costs, especially if a very large volumes of asphalt waste to be treated.

In the method according to the invention there is the further advantage that due to the fact that the asphalt waste that has been softened and brought into the water is separated from one another or divided or crushed the aggregates formed do not adhere to the treatment container or to other aggregates.

Furthermore, it results in * by the separation or Division or crushing of the softened asphalt waste that has been brought into the water is another Advantage that only individual aggregate grains are separated from one another and the aggregate grains as such, cannot be broken open or crushed. This is of considerable importance, in particular as far as the strength of the material is concerned. It is known that the shape or design of the aggregate granules represents is a major factor affecting the strength of the asphalt cement formed with the material influenced or determined. For this reason, asphalt regeneration systems are where the aggregates be destroyed, for example the grinding process, unsuitable for practice. Be opposed to this in the method according to the invention, the aggregates are merely separated from one another and kept at the same time their original shape, so that the problem of strength deterioration nicely arises.

Further embodiments, objects and advantages of the invention emerge from the further description, in the reference to the drawings is. In these drawings shows

F i g. 1 is a schematic vertical sectional view of an asphalt regeneration device according to the invention;

F i p. 2 is a plan view of a further asphalt regeneration device according to the invention;

F i g. 3 is a schematic vertical sectional view of a part in FIG. Asphalt regeneration device illustrated in FIG. 2;

F i g. 4 is a schematic plan view of a further asphalt regeneration device according to the invention and

F i g. 5 is a side view of the FIG. 4 shown device.

According to the invention, heated steam is first introduced into the water present in a container, into which the asphalt waste is then introduced and heated to a predetermined temperature. Normally, the temperature of the asphalt waste at atmospheric pressure of 80 extends to 100 ° C and is insbesc.idere at about 90 ⁰ C. (It is understood that one can use when working under high pressure or under other unusual environmental conditions, other temperatures.) The Asphalt waste heated in this way is separated or divided in the water with the aid of a suitable mechanical device. For example, the asphalt waste is added to the water in the container, heated to 80 to 100 ° C. for about 20 minutes and separated or divided into individual granules in the water with the aid of, for example, a screw.

The ^f in the inventive separation or on "ilung mixture formed consists of a plurality of aggregate granules whose surfaces are each covered with a thin Titumenschicht. The particle size of the aggregates depends on that of the asphalt waste from which have been initially introduced into the water. The particle size may be uniform or inconsistent. The layer of asphalt on the surface of a granule of asphalt waste exhibits strong adhesion to the corresponding granule, but not to other aggregate granules or to the bituminous coating on their surfaces. Therefore, a loose accumulation of aggregate granules is obtained bitumen-coated surfaces that can move independently of each other, so that these aggregate grains can easily be carried along if necessary

Help by sieving into the desired number of particle size groups sorted or classified.

The bitumen coating on the surfaces of the aggregates can contain a small amount of an active substance contain. Preferably the amount in which this active substance is present is in the range of 5 to 20% by weight, and in particular from about 10% by weight, based on the weight. (The ratio can be dependent on the intended use of the product, the type and dimensions of the units, the particular kind of asphalt etc.) Although one can use different active substances active china clay (kaolin or terra alba) and activated charcoal are preferably used together used. Experimental investigations have shown that favorable results can be obtained if when the active ingredient is about 80 to 95% active china clay and about 2 to 5% activated carbon where the asphalt waste is discharged from the upper end of the conveyor 9 is a selection or sorting device, for example a vibrating screen 11, is provided. The sieve 11 is with the sorting lines 13 connected. The steam pipes 2 of the boiler i are connected to the container 4, the upward conveyor 9 or connected to the screw 8, in each of which a porous or apertured steam pipe 3 is arranged is. The container 4 and the conveyor 9 are

ίο Filled with water up to the predetermined level A. Via the pores or openings in the steam pipe 3, heated steam is introduced into the steam contained in the container 4 Water introduced or pressed in.

The method of operation of the device according to the invention described above will be explained in more detail below.

The asphalt waste blocks 15 are from above in the

Container 4 thrown, which can be effectively done with the aid of a shovel loader. the

UCSlCHl. Lyic ufJlfiliaicii Li gculiiaac ci & icii titan uaiiti,

if you have 90% active porcelain earth and 10% activated carbon begins, although the results are to some extent dependent on other conditions of use.

The bitumen coating can also contain lime. The appropriate lime content varies widely the intended use of the product; however, it is usually beneficial to have a Use about the same amount of lime as asphalt.

The mixture of the bitumen-coated aggregates with different particle sizes can be such as it is to be put to various uses. However, the area of application can be expanded., when this material is separated into different groups with approximately the same particle size. For example you can divide the mixture with the help of sieves into the following four groups, which then can be used for different purposes:

a) granules with a diameter ranging from 20 mm to 13 mm:

b) granules ranging in diameter from 13 to 5 mm;

c) granules having a diameter in the range of 5 mm to 2.5 mm; and

d) granules less than 2.5 mm in diameter.

It is also possible to combine the aggregates of these different particle size groups in a suitable Mixing ratio to mix with each other.

In the following, particularly preferred embodiments of the invention are based on the drawings explained in more detail.

The F i g. i shows that inside a container 4, in the following order, a wire mesh is below one another 5, a steam pipe 3 and a comminuting device 6 are arranged. If desired, the Wire mesh 5 and the shredding device 6 can be dispensed with. At the bottom of the container 4 is one Transport device, for example a screw 8, is arranged. The screw 8 can also be used as a separating device serve so that the asphalt is separated or divided without the use of the crushing device 6 can be. The screw 8 is also connected to the lower end of a conveyor 9 for upward conveyance connected to the hot good. In the place

DlX _n L _n ... n ~ A ** Y% ", mntkc * nrnk with t-ΙίΙΓο Aae nriKlnalvAl

5 sorted. In the embodiment shown in FIG. 1, the water level X is in the container 4 above the wire mesh 5. From the boiler, heated steam is introduced into the water contained in the container 4 via the steam pipes 2 and 3, thereby increasing the temperature of the system is brought to an appropriate value, for example, to a temperature of 90 ⁰ C. The Aspha heated in this manner! Waste is divided or broken up into the units with the aid of the shredding device 6 and / or the screw 8. The units separated from one another in this way are transferred with the aid of the upward conveyor 9 into the vibrating sieve 11, where they are separated into the desired number of particle size groups according to their particle size.

The aggregates separated and sorted in this way are combined with a volatile liquid and a Emulsifiers mixed and then processed into regenerated asphalt blocks (room temperature asphalt blocks). It is still possible to get a regenerated asphalt mix by sorting the Heated aggregates. In this way the asphalt waste can be regenerated and used again for the usual training be used by road surfaces.

The following is another embodiment of the asphalt waste regeneration device according to the invention with reference to FIG. 2 and 3 explained.

Although in FIG. 2 two containers 10 and 12 are shown can be with any number of

so containers work. This means that you can use a single container or more than two containers, however, this depends on the respective situation. The containers 10 and 12 are connected to the drive source 18 connected, which is controlled via the control device 20. The container 10 is provided with a kettle 24 connected so that it becomes possible to introduce high pressure heated steam into the container. Similarly, the container 12 is connected to the boiler 22, from which it is under high pressure highly heated steam is supplied. The boilers can also be combined to form one boiler.

The essential features of the device described above are to be found in the following with reference to FIG the F i g. 3 described. The boiler 22 is provided with a plurality of tubes 26, some of which are connected to the conveyor 14 for upward conveyance of the hot material and in part with the interior of the container 12 in connection stand. The pipe 26a in the container 12 is perfo-

iicrt or provided with openings through which the heated steam is introduced or pressed into the water. A separating device or dividing device 28 is arranged on the bottom of the container 12. The separating device 28 shown in the embodiment is a screw separating device which effects the separation or division of the material to be treated while it is moving from left to right, as shown in the drawing. The container 12 is filled with water up to level X. The conveying device 14 for the upward conveyance of hot goods is connected to the container 12 via the pipe 26. Therefore, the water level X in the container 12 and the conveyor 14 are the same. Asphalt waste blocks are introduced into the container 12 from above and heated to the predetermined temperature in the highly heated water. Then the blocks are conveyed to the right, causing them to act

ckc 28 can be separated into individual AggregatkOi ncncn. The aggregate granules separated from one another in this way are conveyed upwards with the aid of the conveyor device 14 and from there transferred to the sorting device 16 (for example a sieve), where they are separated into different particle size groups.

In this embodiment, the appropriate temperature of the water ranges from 80 to 100 ° C and in particular about 9O ⁰ C. The temperature is, however, according to the particular ambient conditions, especially when working under elevated pressure, va: .dbel.

Indeed, the separator 28 is not limited to a screw separator. The sorting device or the sieving device 16 is preferably designed in such a way that it is able to separate the aggregate grains into four groups according to their diameter, i.e. groups with particles of the following diameter:

a) 20 mm to 13 mm,

b) 13 mm to 5 mm,

c) 5 mm to 2.5 mm, and

d) less than 2.5 mm.

It can be seen that, depending on the requirements, a sorting or classification with respect to other particle sizes can be made.

As in FIG. 2, the particles of each group which have been sorted with the aid of the sieve device 16 (which aggregate granules are coated on the surface with a layer of asphalt which prevents the aggregate granules from sticking together) are transferred into the corresponding hopper. For example, the granules with a diameter of 20 mm to 13 mm are fed to the hopper 32. The granules with a diameter of 13 mm to 5 mm are fed to the hopper 34, those with a diameter of 5 mm to 24 mm to the hopper 36 and those with a diameter of less than 2 ^ mm fed to the hopper 38 Similarly, hopper 40, 42, 44 and 46 are provided which are intended to receive the aggregate granules with diameters of 20 to 13 mm, 13 to 5 mm, 5 to 24 mm and less than 24 mm are provided. The hoppers 32, 34, 36 and 38 are connected to a common conveying device 41 which, depending on the control signal from the control device 20, moves either from right to left or from left to right. The conveyor 41 is also connected to a reserve hopper 42 which is used to receive any suitable mixture. It will be seen that more than one reserve hopper can be arranged if necessary. At one end of the conveying device 41 there is arranged a mixing device 43 for dry asphalt which operates at room temperature and which is connected via the conveying device 45 to a clay kneading mixer 48 which operates at room temperature. The mixing device 48 is in turn connected via the conveying device 50 to an asphalt storage device 52 kept at room temperature. Any desired amount of the room temperature asphalt can be withdrawn from the storage facility 52 as required. On the other hand, the other end of the conveyor 41 is connected to a heated mixer for mixing the dry asphalt. The mixing in-ΠΟιϊ'ύΠβ 54 stent üucf uic rOrucrcinnCmüüg jo Ulli ucm dry mixer 58 in connection, which in turn is connected to the buffer tank 62 via a conveying device 60. The heated asphalt mixture can easily be withdrawn from the buffer tank 62 depending on the needs. The aggregates with a particle size of more than 20 mm are discharged in the direction of arrow 64.

Furthermore, the hoppers 32,34,36 and 38 are with Valves 32a, 34a, 36a and 38a, respectively. By appropriately controlling these valves via the control device 20 you can freely choose the mixing ratio of the asphalt mixture. Furthermore, from the Hoppers 40, 42, 44 and 46 each have the corresponding asphalt mixture with a uniform particle size can be withdrawn via the valves 40a, 42a, 44a and 46a, respectively.

In the following, with reference to FIG. 4 and 5 illustrate a further embodiment of the invention.
4 shows an underframe 110 which is movable due to the wheels 112. In the embodiment shown, the underframe is located on a truck, the driver's cab of which is arranged on the left-hand side. To the right of the driver's cab, that is to say behind it, is, as in FIG. 4 is arranged. the underframe 110 which is integrated with the frame. However, if necessary, the undercarriage 110 can be separated from the cab or frame by placing it on a trailer or other device.

The treatment tank 114 is arranged on the underframe 110 and is designed in such a way that it can accommodate water up to a predetermined level. A separating device 116 is arranged in the lower region of the container 114. The particular embodiment of the separating device 116 is not critical, it being said that a screw system is used in the embodiment shown. The separating device 116 is connected to a conveying device 118 which, in the embodiment shown, is a bucket elevator. The conveyor device 118 extends from the separating device 116 to a position above the treatment container 114 and is inclined at an angle. The conveyor device 118 is driven by the motor 120 .

A sorting device 122 is arranged at the front end of the conveyor 118

As in FIG. 4, the treatment tank 114 is shown via the pipe 126 with a boiler 124

connected so that in the container 114 up to one predetermined level filled water is heated to the predetermined temperature, with the help of steam introduced from boiler 124. The type of boiler 124 is not critical, so that a common one Boiler can be used.

The top of the treatment container 114 is provided with an opening 114a through which the Asphalt waste can be introduced. It is of course possible to design the opening differently and for example to close the top and to close the container at another point with an opening Mistake.

In the illustrated embodiment, the top of the treatment vessel 114 is in the above Opened manner described, whereupon the asphalt blocks with the help of the conveyor 128 to Opening 114a are raised, from where they automatically iaiien into the water in the container. When the conveyor 128 is not in use, the asphalt blocks can be retrieved directly with the help of others Devices, for example a shovel loader, are introduced into the container through the opening 114a. The to asphalt mix to be treated is poured into container 114 introduced and there with the help of the water, which by blowing the steam from the boiler 114 to the predetermined Temperature has been heated to the predetermined temperature. Which through this way the heating becomes softened asphalt mix while it is (as shown in the drawing) after is conveyed on the left, comminuted or separated by the separating device 116. After the split treatment the separated aggregate granules with the help of the conveyor 118 are in the Sorting device 122 transferred.

An example of a sorting device 122 will be explained in more detail below. In the embodiment shown a vibrating screen is used as the sorting device 122. The vibrating screen is operated with the aid of the motor 130 shaken and at the same time moved back and forth from right to left (in the drawing), whereby the treated Material is sorted. In the particular embodiment shown, the material is corresponding the particle size separated into four groups. Below the sorting device 124 are four guide devices and hopper 132, 134, 136 and 138, respectively, which contain the granules with diameters from 20 mm to 13 mm, from 13 mm to 5 mm, from 5 mm to 2.5 mm or forward or record with less than 2.5 mm. The guide devices or hopper 132, 134, 136 and 138 are provided with valves 132a, 134a, 136a and 138a, respectively. By controlling the Valves, the mixing ratio of the asphalt mixture can be adjusted in the desired manner. Furthermore, the three guiding devices or hoppers 134, 136 and 138 are via the guiding device or the hopper 140 summarized. In fact, the outlet 132Z> represents the outlet of the guide device or the hopper 132, while the outlet 140a the outlet of the guide device or the hopper 140isL

The underframe 110 is further provided with a drive source 142, a water tank 144 and a fuel tank 146 provided. The drive shaft drives the required motors and is for this Purpose connected to the engine 130 and the engine 148 (with which the separating device 116 is driven. The water container 144 is connected via the pipe 150 the kisses! * \ 24 and still with the container 114 connected. The fuel tank 146 supplies the boiler 124 with fuel. The facilities described above can be

5 can be handled manually, but are shown in FIG Embodiment automatically via the control device 152 controlled. The connection of the control device 152 to the individual devices is Not shown. It must be said, however, that all

10 connections are electrically secured. It is undoubtedly possible to have some facilities automatically and the rest operated manually. However, this depends on the wishes of the user. It can also be seen that the Pipe 126 are provided with a valve 126a and the pipe 150 is provided with a valve 150a.

For this purpose 3 sheets of drawings

Claims (1)

Patent claims: 1. Process for the regeneration of road asphalt waste by treating the asphalt waste with water, heating and crushing the asphalt waste, characterized in that one - Water present in a container is heated by introducing steam; - introduces the asphalt waste into the hot water in the container; - the asphalt waste in the water by introducing steam into the water under the atmospheric pressure to a temperature of about 80 ° to 100 ⁰ C heated; and - The heated and softened asphalt waste brought into the water with the help of a mechanical one Separating device into separate aggregate granules or elements, the surfaces of which are covered with a thin layer of bitumen are covered, separates