EP0858531B1 - Method and apparatus for heating rock material - Google Patents

Method and apparatus for heating rock material Download PDF

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Publication number
EP0858531B1
EP0858531B1 EP96934873A EP96934873A EP0858531B1 EP 0858531 B1 EP0858531 B1 EP 0858531B1 EP 96934873 A EP96934873 A EP 96934873A EP 96934873 A EP96934873 A EP 96934873A EP 0858531 B1 EP0858531 B1 EP 0858531B1
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EP
European Patent Office
Prior art keywords
conveyor
heat
heating
heated
transmitting
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Expired - Lifetime
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EP96934873A
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German (de)
French (fr)
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EP0858531A1 (en
Inventor
Hannu Heikkinen
Matti Karilainen
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Amomatic Oy
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Anomatic Oy
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/05—Crushing, pulverising or disintegrating apparatus; Aggregate screening, cleaning, drying or heating apparatus; Dust-collecting arrangements specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/18—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact
    • F26B3/20—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source being a heated surface, e.g. a moving belt or conveyor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements

Definitions

  • the invention relates to a method for heating rock material, the method comprising following steps: conveying rock material by a conveyor, heating the rock material by a heater arranged above it, heating the conveyor and heating the material both from above the conveyor and by heat from the heated conveyor.
  • the present invention relates to an apparatus for heating rock material, which apparatus comprises a heat-transmitting conveyor and at least one heating unit, arranged above the conveyor for heating the material transported by the conveyor, and that the heat-transmitting conveyor is arranged to be heated in such a way that the heating of the material in the apparatus is accomplished both by the heating unit located above it and by heat from the heated heat-transmitting conveyor.
  • Rock material is used e.g. when concrete, asphalt mix and stone chips are produced. In the production process the rock material is heated to the temperature required for production. Occasionally there is also a need for heating the rock material to dry it.
  • a known solution is e.g. such that heat from an oil burner is used for heating and drying the rock material in a rotating drum.
  • the heated rock material is conveyed to the production equipment for the actual product, where the rock material and the additive are mixed.
  • the additive is bitumen.
  • the solution in question produces emissions harmful both to people and the environment.
  • the oil used in the apparatus has to be stored at the operation site, which is a risk factor.
  • dusting constitutes another problem, which necessitates the use of expensive filtering equipment.
  • the known equipment is sizeable, complicated and expensive.
  • Patent 4 011 023 again discloses an apparatus for lifting up weathered pavement material from the road, heating it and spreading it as new pavement material on the roadbed site, after an additive has been mixed into it.
  • the apparatus comprises two conveyors, provided with heaters.
  • the apparatus disclosed in European Patent Application 0 033 911 comprises two capacitive high-frequency heating units arranged above the conveyor.
  • European Patent Application 0 146 939 discloses an apparatus comprised of a conveyor screw for conveying crumbled asphalt and infrared heating devices provided above it.
  • Another object of the present invention is to provide a new type of apparatus for heating rock material, thereby avoiding the drawbacks of known solutions and making possible an effective processing of rock material.
  • the conveyor is heated by heating the conveyor at an empty running part by an additional heating device separate from the heating unit.
  • an additional heating device separate from the heating unit is arranged to heat an empty running part of the heat-transmitting conveyor.
  • the conveyor is heated so that the rock material fed to the conveyor to be transported, is heated by the combined heating effect from heaters placed above the conveyor and by heat from the heated conveyor.
  • the conveyor is heated by a separate heater, meant to be used exclusively for heating the conveyor.
  • the essential idea in an embodiment of the invention is that the conveyor is run empty, without a load of rock material, with the heaters on, whereupon the conveyor is heated. After that rock material is fed to the conveyor and heated while it is being transported.
  • the surface of the conveyor intended for transporting the rock material is furnished with projections penetrating into the material, whereby heat transmission from the conveyor to the material is enhanced.
  • the advantage of the solution of the invention is that the heating effect of the apparatus considerably improves when heat is transmitted to the material both from the heater above the conveyor and from the conveyor itself, that is, essentially through the whole interface formed by the material.
  • the apparatus can be made smaller which renders it easier to handle under field conditions.
  • the heating method of the invention is more gentle for the material to be heated, as the required heat does not have to be transmitted through one surface layer only.
  • FIG. 1 is a schematic representation of an asphalt mixing plant, where the solution of the invention is utilized for heating rock material.
  • the embodiment in question comprises a device 1 for feeding rock material and a heating device 2 for conveying and simultaneously heating rock material.
  • the mixing plant comprises production equipment 3, which is characteristically a mixing device.
  • the asphalt apparatus further comprises transport conveyor means 4 for conveying prepared asphalt material, produced by the production equipment 3, to a storage section 5 and further to the site of application.
  • production will take place so that rock material or e.g. weathered asphalt material, lifted up from the roadbed site, is fed into the heating device 2 by the feeding device 1, which heating device 2 comprises a conveyor and means for heating the material fed to be transported by the conveyor while it is conveyed to the production equipment 3.
  • the heating device 2 heats the material to the temperature required for production.
  • the rock material can also be dried by heating it by means of the heating device 2.
  • the heating device 2 is arranged between the feeding device 1 and the production equipment 3.
  • the material heated by the heating device 2 and conveyed to the production equipment 3 is mixed there with the other ingredients of the product, e.g. bitumen.
  • the production process can be cyclic; i.e. the production equipment 3 is charged with material fed by the heating device 2 and with other materials, fed by other transport means, after which charging Is interrupted and the production process started.
  • the production equipment 3 is a mixing device that mixes the charged materials. When the production batch is ready, it is conveyed by the conveyor 4 to the storage section 5 to remain there until it is transferred to the site of application.
  • the whole apparatus illustrated above can be constructed to be highly mobile so that it can be moved to the vicinity of the site of application. It is further possible that the plant comprises several heating devices 2 and it is also possible to arrange weighing or handling appliances or intermediate storage between the feeding device 1 and the production equipment 3.
  • FIGs 2 - 4 show a cut-away side view of some heating devices 2 of the invention, presented in a schematical, simplified way.
  • the heating device 2 shown in figure 2 comprises a heat-transmitting conveyor 6, preferably a slat conveyor, but it can also be any other type of conveyor providing an equivalent function and forming a closed loop.
  • Heating units 7, e.g. infrared units or similar radiant heaters, are arranged near the heat-transmitting conveyor 6, preferably above the heat-transmitting conveyor 6.
  • Preferably liquid gas is used to provide heating energy, but other energy sources may also come into question.
  • the number of heating units 7 and their power is designed to meet the heat requirements and suit the dimensions of the heating device 2.
  • the heating device 2 is preferably fitted inside a cover, illustrated in figure 4.
  • the heating device 2 illustrated in figure 2 is continuously working and it is cyclically charged from the feeding device 1 with material to be heated and transported.
  • the heating device 2 is run empty, without transported material, while the heating units 7 are working and heating the heat-transmitting conveyor 6.
  • the heat-transmitting conveyor 6 stores heat in its structure.
  • Now feeding device 1 is charging material to the heat-transmitting conveyor 6, by which it is conveyed toward the production equipment 3, while the material is simultaneously heated by the heating units 7, arranged above the heat-transmitting conveyor 6. What is essential is that in accordance with the idea of the invention, the material is heated also by heat transmitted to it from the structure of the-heated heat-transmitting conveyor 6.
  • FIG 3 again shows an embodiment of the heating device according to Figure 2, wherein the heat-transmitting conveyor 6 is arranged to be heated, in addition to the heating units 7 arranged above the conveyor, by separate, additional heaters 9, which can be constructed like the heating units 7.
  • the additional heating units 9 can be arranged, as illustrated in the figure, to heat the empty part of the heat-transmitting conveyor 6 below the conveyor part that returns empty.
  • FIG 4 shows an embodiment of the heating device of Figure 2, where the additional heaters 9 are arranged inside the closed loop formed by the heat-transmitting conveyor 6, in the space between that part of the conveyor that is conveying the material and the part that is returning empty.
  • the additional heaters 9 heat the empty part of the heat-transmitting conveyor 6 from the inner side of the conveyor part that returns empty, i.e. the side that is not meant to lie against the material to be conveyed, as illustrated in the figure.
  • the additional heaters 9 are preferably positioned so that the heating effect is directed downwards, which prevents material possibly dropping from the heat-transmitting conveyor 6 from entering the additional heater 9 and catching fire there.
  • protrusions 10 are provided on the surface of the heat-transmitting conveyor 6 that lies against the material, to improve heat transmission from the heat-transmitting conveyor 6 to the material.
  • the protrusions 10 can be either fixed or replaceable elements protruding from the surface of the heat-transmitting conveyor 6.
  • the protrusion 10 is of a laminar construction so that its heat-emitting surface is large.
  • the protrusion 10 can also comprise e.g. a lattice and form a kind of grate.
  • the apparatus in Figure 4 can be used both for cyclical and continuous charging.
  • a cover 8 is shown in the figure, which can be insulated to minimize energy consumption and be provided with devices for removing gases, formed during the heating process, from inside the cover 8.
  • the gases are sucked out by a fan 11 and led to the feeding device 1 through a duct 12.
  • the air heated in the heating device 2 is thus being utilized for preheating the material and simultaneously air impurities like dust and harmful gases are bound to the charged material.
  • a filtering apparatus can be arranged in the duct 12 for removing impurities.
  • the invention is also suitable for heating a ready mixture like rock material and bitumen, for example. In the same way, it can also be used for heating and handling materials other than rock materials.
  • the invention to which the application relates can be implemented in conveying and simultaneously heating plastic, glass and similar materials. Further, the invention can be implemented in processing and drying waste liquor from the paper industry. It is also possible that the apparatus comprises the additional heaters arranged both as shown in Figure 3 and in Figure 4, which will make the heating of the heat-transmitting conveyor very effective.

Abstract

The present invention relates to a method for heating rock material when concrete, asphalt mix and similar products are produced. According to the method, rock material is heated by the combined action of a heating unit (7) located above the conveyor and a heated heat-transmitting conveyor (6). Heat is transferred by the convection from the heated heat-transmitting conveyor (6) to the material that is being transported. Further, the invention relates to an apparatus for heating rock material. The apparatus comprises a heat-transmitting conveyor (6) which is heated, either merely by a heating unit (7) located above it, when the conveyor is not used for charging, or by a separate, additional heating device (9) or by a combination of the above mentioned alternatives.

Description

The invention relates to a method for heating rock material, the method comprising following steps: conveying rock material by a conveyor, heating the rock material by a heater arranged above it, heating the conveyor and heating the material both from above the conveyor and by heat from the heated conveyor.
Further, the present invention relates to an apparatus for heating rock material, which apparatus comprises a heat-transmitting conveyor and at least one heating unit, arranged above the conveyor for heating the material transported by the conveyor, and that the heat-transmitting conveyor is arranged to be heated in such a way that the heating of the material in the apparatus is accomplished both by the heating unit located above it and by heat from the heated heat-transmitting conveyor.
Rock material is used e.g. when concrete, asphalt mix and stone chips are produced. In the production process the rock material is heated to the temperature required for production. Occasionally there is also a need for heating the rock material to dry it.
A known solution is e.g. such that heat from an oil burner is used for heating and drying the rock material in a rotating drum. The heated rock material is conveyed to the production equipment for the actual product, where the rock material and the additive are mixed. When asphalt mix is produced the additive is bitumen. However, the solution in question produces emissions harmful both to people and the environment. Furthermore, the oil used in the apparatus has to be stored at the operation site, which is a risk factor. When the rock material is mixed and the fine particles dry, dusting constitutes another problem, which necessitates the use of expensive filtering equipment. Moreover, the known equipment is sizeable, complicated and expensive.
Furthermore, there are known solutions where asphalt material is heated by means of a heating appliance, arranged in connection with a conveyor, and where the asphalt is heated as it is conveyed forward by the conveyor. Finnish Patent Application 850 526 discloses a method and an apparatus for heating rock material, the apparatus comprising a conveyor on which radiators are placed that heat the rock material conveyed by the conveyor. Furthermore U.S. Patents 4 256 414 and 4 011 023 and European Patent Applications 0 033 911 and 0 146 939 disclose apparatuses for heating and recycling used asphalt. In U.S. Patent 4 256 414 an apparatus is disclosed that comprises a conveyor above which a heating device is provided. U.S. Patent 4 011 023 again discloses an apparatus for lifting up weathered pavement material from the road, heating it and spreading it as new pavement material on the roadbed site, after an additive has been mixed into it. The apparatus comprises two conveyors, provided with heaters. The apparatus disclosed in European Patent Application 0 033 911 comprises two capacitive high-frequency heating units arranged above the conveyor. Further, European Patent Application 0 146 939 discloses an apparatus comprised of a conveyor screw for conveying crumbled asphalt and infrared heating devices provided above it. However, the drawback with the solutions mentioned above is that to be heated sufficiently the conveyor necessarily has to be made quite long or several conveyors must be employed, since enough heat cannot by using the methods in question, be transmitted to the material without impairing the quality of the material, when it is conveyed only a short distance. If the surface temperature of the material is raised too high the material starts to fume or even bum. Moreover, the apparatus is large, complicated and expensive.
It is an object of the present invention to provide a method for heating rock material that will make the processing of rock material effective and economical.
Another object of the present invention is to provide a new type of apparatus for heating rock material, thereby avoiding the drawbacks of known solutions and making possible an effective processing of rock material.
It is characteristic of the method of the present invention that the conveyor is heated by heating the conveyor at an empty running part by an additional heating device separate from the heating unit.
It is further characteristic of the apparatus of the present invention that an additional heating device separate from the heating unit is arranged to heat an empty running part of the heat-transmitting conveyor.
It is an essential idea of the invention that the conveyor is heated so that the rock material fed to the conveyor to be transported, is heated by the combined heating effect from heaters placed above the conveyor and by heat from the heated conveyor. The conveyor is heated by a separate heater, meant to be used exclusively for heating the conveyor. Furthermore, the essential idea in an embodiment of the invention is that the conveyor is run empty, without a load of rock material, with the heaters on, whereupon the conveyor is heated. After that rock material is fed to the conveyor and heated while it is being transported. Furthermore, it is an essential idea in another embodiment of the invention that the surface of the conveyor intended for transporting the rock material is furnished with projections penetrating into the material, whereby heat transmission from the conveyor to the material is enhanced.
The advantage of the solution of the invention is that the heating effect of the apparatus considerably improves when heat is transmitted to the material both from the heater above the conveyor and from the conveyor itself, that is, essentially through the whole interface formed by the material. Thus the apparatus can be made smaller which renders it easier to handle under field conditions. Moreover, the heating method of the invention is more gentle for the material to be heated, as the required heat does not have to be transmitted through one surface layer only.
The invention will be explained in greater detail in the accompanying drawings, where
  • Figure 1 is a schematic representation of an asphalt concrete mixing plant, where an apparatus according to the embodiment of the invention is utilized for heating rock material, and
  • Figures 2 - 4 show a schematic, cut-away side view of some conveyor apparatus of the invention for heating rock material.
    • Figure 1 is a schematic representation of an asphalt mixing plant, where the solution of the invention is utilized for heating rock material. The embodiment in question comprises a device 1 for feeding rock material and a heating device 2 for conveying and simultaneously heating rock material. Additionally the mixing plant comprises production equipment 3, which is characteristically a mixing device. The asphalt apparatus further comprises transport conveyor means 4 for conveying prepared asphalt material, produced by the production equipment 3, to a storage section 5 and further to the site of application. In the apparatus illustrated in the figure, production will take place so that rock material or e.g. weathered asphalt material, lifted up from the roadbed site, is fed into the heating device 2 by the feeding device 1, which heating device 2 comprises a conveyor and means for heating the material fed to be transported by the conveyor while it is conveyed to the production equipment 3. The heating device 2 heats the material to the temperature required for production. The rock material can also be dried by heating it by means of the heating device 2. Thus the heating device 2 is arranged between the feeding device 1 and the production equipment 3. The material heated by the heating device 2 and conveyed to the production equipment 3 is mixed there with the other ingredients of the product, e.g. bitumen. The production process can be cyclic; i.e. the production equipment 3 is charged with material fed by the heating device 2 and with other materials, fed by other transport means, after which charging Is interrupted and the production process started. The production equipment 3 is a mixing device that mixes the charged materials. When the production batch is ready, it is conveyed by the conveyor 4 to the storage section 5 to remain there until it is transferred to the site of application. After this the phases of the cycle described above are repeated. The whole apparatus illustrated above can be constructed to be highly mobile so that it can be moved to the vicinity of the site of application. It is further possible that the plant comprises several heating devices 2 and it is also possible to arrange weighing or handling appliances or intermediate storage between the feeding device 1 and the production equipment 3.
    Figures 2 - 4 show a cut-away side view of some heating devices 2 of the invention, presented in a schematical, simplified way. The heating device 2 shown in figure 2 comprises a heat-transmitting conveyor 6, preferably a slat conveyor, but it can also be any other type of conveyor providing an equivalent function and forming a closed loop. Heating units 7, e.g. infrared units or similar radiant heaters, are arranged near the heat-transmitting conveyor 6, preferably above the heat-transmitting conveyor 6. Preferably liquid gas is used to provide heating energy, but other energy sources may also come into question. The number of heating units 7 and their power is designed to meet the heat requirements and suit the dimensions of the heating device 2. The heating device 2 is preferably fitted inside a cover, illustrated in figure 4. The heating device 2 illustrated in figure 2 is continuously working and it is cyclically charged from the feeding device 1 with material to be heated and transported. When the cyclically working production unit 3 is not charged with material by means of the heating device 2, the heating device 2 is run empty, without transported material, while the heating units 7 are working and heating the heat-transmitting conveyor 6. The heat-transmitting conveyor 6 stores heat in its structure. When the production equipment 3 has turned out the previous lot, it is emptied and recharging begun. Now feeding device 1 is charging material to the heat-transmitting conveyor 6, by which it is conveyed toward the production equipment 3, while the material is simultaneously heated by the heating units 7, arranged above the heat-transmitting conveyor 6. What is essential is that in accordance with the idea of the invention, the material is heated also by heat transmitted to it from the structure of the-heated heat-transmitting conveyor 6.
    Figure 3 again shows an embodiment of the heating device according to Figure 2, wherein the heat-transmitting conveyor 6 is arranged to be heated, in addition to the heating units 7 arranged above the conveyor, by separate, additional heaters 9, which can be constructed like the heating units 7. The additional heating units 9 can be arranged, as illustrated in the figure, to heat the empty part of the heat-transmitting conveyor 6 below the conveyor part that returns empty. Thus it is possible to heat the heat-transmitting conveyor 6 continuously, also when it is used for charging the production equipment 3. So this solution can be applied, not only in cyclical operation, but also in situations where continuous recharging is required.
    Further Figure 4 shows an embodiment of the heating device of Figure 2, where the additional heaters 9 are arranged inside the closed loop formed by the heat-transmitting conveyor 6, in the space between that part of the conveyor that is conveying the material and the part that is returning empty. Preferably the additional heaters 9 heat the empty part of the heat-transmitting conveyor 6 from the inner side of the conveyor part that returns empty, i.e. the side that is not meant to lie against the material to be conveyed, as illustrated in the figure. The additional heaters 9 are preferably positioned so that the heating effect is directed downwards, which prevents material possibly dropping from the heat-transmitting conveyor 6 from entering the additional heater 9 and catching fire there. It is also shown in the figure that protrusions 10 are provided on the surface of the heat-transmitting conveyor 6 that lies against the material, to improve heat transmission from the heat-transmitting conveyor 6 to the material. The protrusions 10 can be either fixed or replaceable elements protruding from the surface of the heat-transmitting conveyor 6. Preferably the protrusion 10 is of a laminar construction so that its heat-emitting surface is large. The protrusion 10 can also comprise e.g. a lattice and form a kind of grate. Further, if the conveyor is arranged to slope enough vertically, a mixing of the material can be achieved with these protrusions 10. Due to the additional heaters 9, the apparatus in Figure 4 can be used both for cyclical and continuous charging. Additionally, a cover 8 is shown in the figure, which can be insulated to minimize energy consumption and be provided with devices for removing gases, formed during the heating process, from inside the cover 8. The gases are sucked out by a fan 11 and led to the feeding device 1 through a duct 12. The air heated in the heating device 2 is thus being utilized for preheating the material and simultaneously air impurities like dust and harmful gases are bound to the charged material. A filtering apparatus can be arranged in the duct 12 for removing impurities.
    Although the invention has been described in the foregoing with reference to examples in accordance with the accompanying drawings, it is obvious that the invention is not restricted merely to them, but can be modified in many ways within the scope of the inventive idea disclosed in the claims. Thus the invention is also suitable for heating a ready mixture like rock material and bitumen, for example. In the same way, it can also be used for heating and handling materials other than rock materials. The invention to which the application relates can be implemented in conveying and simultaneously heating plastic, glass and similar materials. Further, the invention can be implemented in processing and drying waste liquor from the paper industry. It is also possible that the apparatus comprises the additional heaters arranged both as shown in Figure 3 and in Figure 4, which will make the heating of the heat-transmitting conveyor very effective.

    Claims (8)

    1. A method for heating rock material, the method comprising following steps: conveying rock material by a conveyor, heating the rock material by a heater arranged above it, heating the conveyor and heating the material both from above the conveyor and by heat from the heated conveyor,
      characterized by heating the conveyor at an empty running part by an additional heating device (9) separate from the heating unit (7).
    2. A method according to claim 1, characterized in that the rock material is heated by means of a heating unit (7) and the conveyor used in a cyclical manner so that the conveyor, as it is running empty, is first heated by the heating unit (7), and when the conveyor has been heated enough, material is fed to the conveyor by the feeding device (1) to be heated by the combined action of the heat from the heating unit (7) and heat transmitted by the conveyor as the material is conveyed by the conveyor.
    3. An apparatus for heating rock material, which apparatus comprises a heat-transmitting conveyor (6) and at least one heating unit (7), arranged above the conveyor for heating the material transported by the conveyor, and that the heat-transmitting conveyor (6) is arranged to be heated in such a way that the heating of the material in the apparatus is accomplished both by the heating unit (7) located above it and by heat from the heated heat-transmitting conveyor (6), characterized in that an additional heating device (9) separate from the heating unit (7) is arranged to heat an empty running part of the heat-transmitting conveyor (6).
    4. An apparatus according to claim 3, characterized in that the additional heating device (9) is arranged to heat the heat-transmitting conveyor (6) underneath the heat-transmitting conveyor (6).
    5. An apparatus according to claim 3, characterized in that the additional heating device (9) is arranged inside the closed loop formed by the heat-transmitting conveyor (6).
    6. An apparatus according to any one of the preceding claims 3 - 5, characterized in that the heat-transmitting conveyor (6) is charged cyclically and that the heat-transmitting conveyor (6) is arranged to be heated by means of the additional heating device (9) and/or by the heating unit (7) while it is empty.
    7. An apparatus according to any one of claims 3 - 6, characterized in that the surface of the heat-transmitting conveyor (6), which lies against the material is provided with protrusions (10) that improve heat transmission from the heat-transmitting conveyor (6) to the material.
    8. An apparatus according to any one of claims 3 - 7, characterized in that the heating device (2) comprises an insulated cover (8), a duct (12) leading from the cover (8) to the feeding device (1), and a fan (11) for conducting gases and heat produced in the heating device (2) to the material in the feeding device (1).
    EP96934873A 1995-11-02 1996-11-01 Method and apparatus for heating rock material Expired - Lifetime EP0858531B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    FI950466U FI2227U1 (en) 1995-11-02 1995-11-02 Anordning Foer uppvaermning av stenmaterial
    FI950466U 1995-11-02
    PCT/FI1996/000587 WO1997016600A1 (en) 1995-11-02 1996-11-01 Method and apparatus for heating rock material

    Publications (2)

    Publication Number Publication Date
    EP0858531A1 EP0858531A1 (en) 1998-08-19
    EP0858531B1 true EP0858531B1 (en) 2003-03-26

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP96934873A Expired - Lifetime EP0858531B1 (en) 1995-11-02 1996-11-01 Method and apparatus for heating rock material

    Country Status (6)

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    EP (1) EP0858531B1 (en)
    AT (1) ATE235608T1 (en)
    AU (1) AU7300596A (en)
    DE (1) DE69627001T2 (en)
    FI (1) FI2227U1 (en)
    WO (1) WO1997016600A1 (en)

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    EP1014021A3 (en) * 1998-12-24 2001-09-26 GoGas Goch GmbH & Co Dryer for bulk material
    FR2866037B1 (en) * 2004-02-09 2006-04-28 Emile Lopez METHOD AND DEVICE FOR TEMPERATURING GRANULATES AND / OR ROAD COVERS, IN PARTICULAR COATED USES FOR RECYCLING
    CN110986552A (en) * 2019-11-29 2020-04-10 苏州氟特电池材料股份有限公司 Efficient lithium battery material stoving case
    CN111058355A (en) * 2019-12-26 2020-04-24 无锡锡通工程机械有限公司 Low-temperature catalytic gas medium-long wave drying drum
    CN112608759A (en) * 2020-12-06 2021-04-06 河南九一环保科技股份有限公司 Method for heating stone by using solar energy

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    Publication number Priority date Publication date Assignee Title
    GB191123694A (en) * 1911-10-26 1912-10-03 Henry Frank Berry Improvements in Apparatus for Heating, Drying and otherwise Treating Stone and other Materials for use on Roads and like Surfaces.
    US4011023A (en) * 1975-12-15 1977-03-08 Cutler Repaving, Inc. Asphalt pavement recycling apparatus
    DE3005183A1 (en) * 1980-02-12 1981-08-20 Siemens AG, 1000 Berlin und 8000 München DEVICE FOR CAPACITIVE HIGH-FREQUENCY HEATING OF ASPHALT- OR TEAR-CONTAINING BREAK MATERIAL
    DE3347370C1 (en) * 1983-12-29 1985-05-23 Deutag-Mischwerke GmbH, 5000 Köln Device for heating shredded asphalt

    Also Published As

    Publication number Publication date
    FI2227U1 (en) 1995-12-18
    DE69627001D1 (en) 2003-04-30
    WO1997016600A1 (en) 1997-05-09
    ATE235608T1 (en) 2003-04-15
    EP0858531A1 (en) 1998-08-19
    AU7300596A (en) 1997-05-22
    DE69627001T2 (en) 2004-01-29
    FIU950466U0 (en) 1995-11-02

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