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EP0149595A2 - Procédé et dispositif de régénération de sables de fonderie - Google Patents

Procédé et dispositif de régénération de sables de fonderie Download PDF

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Publication number
EP0149595A2
EP0149595A2 EP85890004A EP85890004A EP0149595A2 EP 0149595 A2 EP0149595 A2 EP 0149595A2 EP 85890004 A EP85890004 A EP 85890004A EP 85890004 A EP85890004 A EP 85890004A EP 0149595 A2 EP0149595 A2 EP 0149595A2
Authority
EP
European Patent Office
Prior art keywords
sand
cleaning
containers
container
rotary drum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP85890004A
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German (de)
English (en)
Other versions
EP0149595B1 (fr
EP0149595A3 (en
Inventor
Volker Dipl.-Ing. Godderidge
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kgt Giessereitechnik GmbH
Original Assignee
GSR SANDREGENERIERUNGSGESELLSCHAFT MBH
Kgt Giessereitechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25817474&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0149595(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE19843400648 external-priority patent/DE3400648A1/de
Priority claimed from DE19843400656 external-priority patent/DE3400656A1/de
Application filed by GSR SANDREGENERIERUNGSGESELLSCHAFT MBH, Kgt Giessereitechnik GmbH filed Critical GSR SANDREGENERIERUNGSGESELLSCHAFT MBH
Priority to AT85890004T priority Critical patent/ATE33105T1/de
Priority to DK212385A priority patent/DK157740C/da
Publication of EP0149595A2 publication Critical patent/EP0149595A2/fr
Publication of EP0149595A3 publication Critical patent/EP0149595A3/de
Application granted granted Critical
Publication of EP0149595B1 publication Critical patent/EP0149595B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/18—Plants for preparing mould materials

Definitions

  • the invention relates to a process for the regeneration of foundry rubble sands which contain old sand mixtures with organic and inorganic binders, such as active and still burned bentonite and synthetic resins and optionally further sludge materials, such as hard coal dust, polystyrene, fine quartz dust, etc., in which process the crushed and optionally sieved foundry sand is used Removal of organic binders is subjected to thermal regeneration by heating and then to post-cleaning, in which binder residues adhering to the sand grains are mechanically removed from the grain surfaces.
  • organic and inorganic binders such as active and still burned bentonite and synthetic resins and optionally further sludge materials, such as hard coal dust, polystyrene, fine quartz dust, etc.
  • green sand molds with green sand being a quartz sand with inorganic binders, e.g. Bentonite (clay) is understood.
  • the green sand is mechanically solidified with the addition of water by shaking to the required dimensional stability.
  • core pieces are inserted into the green sand molds, which are formed from quartz sand with the addition of organic binders, such as furan resins or phenolic resins.
  • the core gets its strength through chemical hardening of the binders.
  • the core pieces disintegrate due to the thermal load during the casting process, as a result of which a mixture of green sand and core sand (“rubble sand”) is formed which, if it is to be used again, has to be processed.
  • HW Zimnawoda and H. Jansen point out the possibility of regenerating foundry sands in a two-stage process, whereby the main part of the clay residues is to be removed by wet regeneration in a first stage and the organic binder parts by annealing in a subsequent thermal stage (750 - 820 ° C) should be removed completely (Zimnawoda loc. Cit. Page 597 and Jansen loc. Cit. Page 604).
  • wet regeneration (“water purification") is expensive, whereas Jansen doubts the practical application of the combined regeneration process.
  • this prior art two step procedure can only be satisfactorily applicable b ar when the clay content of the so-called rubble sand is less than 4%.
  • Slurries are understood to mean the components of active bentonite (swellable bentonite), still burned bentonite (non-swellable bentonite), hard coal dust or so-called lignite carbon fractions, such as polystyrene, resins and quartz fine dust.
  • Rubble sands but especially those with a sludge content of approx. 10% and more, are therefore regularly deposited in landfills. Due to the ever decreasing number of suitable landfills and the large amount of rubble sands, there are considerable space problems. This waste of raw materials is economically unjustifiable due to the transport costs and landfill fees incurred and the expensive new sand that is only available to a limited extent. In addition, there are environmental problems due to the chemical components in the rubble sands, since these components can be washed out under the influence of the weather when it rains and there is a risk of contamination of the groundwater.
  • the invention has for its object to provide a method with which a complete regeneration of foundry rubble sands with a high sludge content is possible down to the quality level of new sand, so that the regenerate can be processed like new sand during core production.
  • the foundry sand is subjected to a dry pre-cleaning prior to thermal regeneration, in which sludge adhering to the sand grains, in particular inorganic binders, are removed from the sand grains by mixing and circulating the same in the foundry sand, preferably around a horizontal one Axis is a grain-to-grain rubbing and / or in which the grains of sand are radially accelerated and hurled against a stationary, ring-shaped baffle surface and that the removed slag materials are then separated from the foundry sand that has been pre-cleaned, preferably by a gas-air stream.
  • the three-stage process according to the invention - mechanical pre-cleaning, thermal treatment, mechanical post-cleaning - surprisingly achieves a high-quality regenerated quartz sand which can be used indefinitely for all of the core manufacturing processes that occur.
  • up to 75% recovery of high-quality regenerated quartz sand is possible.
  • the intensive mechanical pre-cleaning advantageously reduces the sludge content of the debris sand to be regenerated to 2 to 4%. This is preferably done by intensive grain-to-grain friction and / or by allowing the sand grains to impact, so that impurities adhering to quartz sand grain are rubbed off, ground off and / or blasted off.
  • the foundry sand is dried and preheated during the pre-cleaning by warm exhaust gas originating from the thermal regeneration. Since the exhaust gas from the furnace is used as the gas flow to separate the sludge, the rubble sand is dried and preheated in the pre-cleaning phase. This ensures low energy consumption for carrying out the method.
  • the foundry sand is preferably dried to a water content of 0.5% in the pre-cleaning phase.
  • the invention also relates to a device for the thermal regeneration of foundry rubble sands, which contains old sand mixtures with organic and inorganic binder parts, such as active and still burned bentonite and synthetic resins, and optionally further sludge materials, such as hard coal dust, polystyrene, quartz fine dust, etc., with an oven, preferably one.
  • Fluid bed furnace in which the foundry sand is heated for the purpose of annealing and a cleaning device downstream of the furnace for mechanical cleaning supply, which is preferably designed as a rotating drum with a substantially horizontal axis and / or as a centrifugal wheel cleaner.
  • the invention is further based on the object of developing a device of this type in such a way that, particularly using the method according to the invention, rubble sands with high sludge contents can be regenerated down to the quality level of new sand, so that the regenerate, like new sand, can also be processed in the core production .
  • the device according to the invention for the regeneration of foundry rubble sands should be largely prefabricated and easily transportable and should be able to be put into operation easily and in a short time at the place of use.
  • the furnace is preceded by a rotary drum which can be rotated about an essentially horizontal axis and / or a waterless mechanical pre-cleaning device which is designed as a centrifugal wheel cleaner, baffle internals preferably being arranged in the rotary drum and / or grinding media, like balls or the like, are included, and that the device is arranged in several transportable containers, whereby in the area of the ceilings and / or the floors of the congruent containers that can be set up one on top of the other, connecting flanges, intermediate pieces, couplings or plug connections for connecting the individual units of Device are provided.
  • the dry-working pre-cleaning device is a centrifugal wheel cleaner and / or a cylindrical drum rotating about a horizontal axis, in which baffle internals in the form of sheets or grinding media, such as balls or the like, are preferably arranged or accommodated.
  • baffle internals in the form of sheets or grinding media, such as balls or the like are preferably arranged or accommodated.
  • intensive rubble sand comminution is achieved in the course of pre-cleaning, which results in a high level of efficiency degree of thermal regeneration in the downstream furnace.
  • this mechanical pre-cleaning which is also possible for pure green sand, has the var part that the wear of the machine is less and the self-stressing of the sand in the rotating drum does not lead to increased fine dust proportions or to the destruction of the sand grain structure.
  • the necessary connections between the containers can be formed by intermediate pieces, quick couplings, plug connections and / or connecting flanges, the connections of which are congruent with one another.
  • the arrangement in containers creates a mobile system that can be easily brought on site and that can be installed and removed with little effort. In this way, it is possible for the first time to regenerate rubble sand that has been generated cost-effectively in the service process.
  • Such a system is also particularly suitable for carrying out experiments, since as a rule the suitable conditions for a regeneration process must be examined on site for practical testing in a pilot process.
  • the line for the supply air for the fluid bed furnace is connected to the rotary drum for subsequent cleaning, the supply air being supplied through this rotary drum.
  • the container sea containers have corresponding dimensions.
  • the units in particular the machines in the respective container, are mounted in a vibration-damped manner.
  • an elevator for feeding the rubble sand to be regenerated to the loading point provided in the upper container is arranged next to the stacked containers.
  • the device according to the invention can be accommodated in (used) sea containers. However, it is also possible to arrange the units in container-like containers. It is recommended according to the invention to provide that some of the units arranged in the containers, in particular the containers, the support structure for the rollers and the drives of the rotary drums and / or the fluidized bed furnace, at least partially in the frame, wall, floor and / or Ceiling construction of the affected containers are integrated.
  • the device according to FIG. 1 is essentially arranged in three transportable containers I to III, which are congruent with one another.
  • Quick connections and connecting flanges are provided in the connection levels between the containers in order to connect the units provided in the individual containers to one another.
  • the connections are preferably congruent.
  • the containers used in the exemplary embodiment have the dimensions standardized for sea containers. For example, they are 12.19 m long, 2.44 m wide and 2.59 m high on the outside.
  • a feed silo 2 with a vibrator channel 3 arranged below it is arranged in the upper container III.
  • a filter system 22 is installed, which filters the exhaust air of the device before being discharged into the open.
  • a fluidized bed furnace 9 is provided in container III, in which the thermal treatment (second stage of the method according to the invention) of the rubble sand is carried out.
  • a buffer 12 and an output silo 18 are provided in container III.
  • a magnetic separator 4 In the middle container II, a magnetic separator 4, two cylindrical rotary drums 5 and 10, each with a horizontal axis of rotation 24, and a mechanical screening system 13 are arranged side by side.
  • Each rotary drum 5 and 10 is assigned a blower 6 or 23.
  • the rubble sand is pretreated for pre-cleaning before being placed in the fluidized bed furnace 9, in which the rubble sand is annealed for thermal regeneration.
  • the rotating drum 10 arranged in the longitudinal direction behind the rotating drum 5 serves for the subsequent cleaning of the rubble sand flowing out of the fluidized bed furnace 9.
  • a gas system 20 In the lower container I, a gas system 20, a compressed air system 21, a buffer store 7 with a pneumatic conveyor 8 arranged underneath, a controller 19, a further pneumatic conveyor 11 and several containers 14 for quartz sand, each with a grain size, are arranged side by side, the one in the containers 14 located sand is drawn off via a metering system 15 and a downstream mixing screw 16 is fed, which feeds the mixture to a further pneumatic conveyor 17.
  • the feed silo 2 in the upper container III is conveyed by a conveyor 1, e.g. feeds an elevator, the hopper 25 is provided at the level of the lower container I near the ground.
  • a conveyor 1 e.g. feeds an elevator
  • the hopper 25 is provided at the level of the lower container I near the ground.
  • a down pipe 26 leads downwards from the discharge silo 18, which ends approximately in the area of the bottom of the middle container II and to which further transport devices can be connected in order to recycle the regrind to be able to get to the site.
  • the device accommodated in the three containers I, II and III only requires an electrical power connection in order to be ready for operation. After loosening the quick-release connections provided between the containers, the containers - each individually - are portable and can be brought to any location. This has the advantage, for example, that the regeneration of different rubble sands can be tested on site under practical conditions.
  • the containers can advantageously be provided such that the individual units, in particular the machines (vibrator trough 3, magnetic separator 4, the blowers, the pneumatic conveyors, the screening system 13, the metering system 14, etc.) are mounted in a vibration-damped manner within the respective container will.
  • the machines vibrator trough 3, magnetic separator 4, the blowers, the pneumatic conveyors, the screening system 13, the metering system 14, etc.
  • any remaining pieces of the cast found in the rubble sand are separated off and discharged via a down pipe 27.
  • the first phase of the regeneration takes place in the form of a dry pre-cleaning in the first rotating drum 5.
  • conventional baffles are provided in the form of sheets, which determine the path of the incoming rubble sand and ensure further comminution.
  • 5 grinding elements in the form of balls or the like can be provided in the rotary drum, whereby a good comminution of the rubble sand is achieved.
  • the exhaust gas emitted by the fluidized bed furnace 9 is cleaned of dust particles etc. by the filter system 22 and fed to the hot air blower 6 in the line 29 symbolized by arrows, which blows the hot exhaust gases horizontally into the rotary drum 5, preferably coaxially with the axis of rotation 24.
  • the heat content of the exhaust gas from the fluidized bed furnace 9 can be used and the energy requirement of the overall system can be kept low.
  • the horizontally entering gas stream dries the rubble sand, for example, up to a water content of 0.5% and takes abrasion and floating particles with it, which are separated by the filter system 22 in the upper container III before the gas stream exits.
  • the binders in the green sand in particular namely the bentonites, being separated from the quartz grain by grain-to-grain friction and discharged.
  • the crushed, pre-cleaned and preheated rubble sand falls into the buffer store 7 in the lower container I, from which it is drawn off via the pneumatic conveyor 8 via a pipeline 28 and fed to the fluidized bed furnace 9 in the container III.
  • the rubble sand is heated to a temperature of approximately 800 ° C., as a result of which the organic additives such as hardener and binder of the core sand burn. Bentonites that are still active are burned to death and lose their ability to swell. The combustion residues are discharged by air supplied by the fan 30 and filtered out in the filter system 22. The preferably cleaned exhaust gas from the fluidized bed furnace 9 is then fed via line 29 to the intake port of the hot air blower 6 assigned to the rotary drum 5 in the middle container II.
  • the rotary drum 10 corresponds to the structure of the drum 5, also rotates about the horizontal axis 24 and preferably also has baffles and / or grinding elements in the interior like bullets or the like.
  • Cooling air is fed to the rotary drum 10 horizontally and preferably coaxially to the axis of rotation 24 via a blower 23, which cools the sand in the drum 10 and at the same time discharges the combustion residues of the hardener and binder which have been abraded and ground by grain-to-grain friction.
  • the post-cleaning and the cooling of the regenerate take place simultaneously, so that voluminous cooling units for the regenerate can be dispensed with.
  • regenerate falls through a down pipe 31 into the pneumatic conveyor 11 and is conveyed through a pipeline 32 into the intermediate storage silo 12 in the upper container III.
  • the regrind is then classified by the sieve system 13 according to grain sizes and the grain fractions are temporarily stored in containers 14 in the lower container I.
  • the undersize (quartz sand dust etc.) is discharged directly via a downpipe 33 into containers (not shown) or other collection or transport devices.
  • Quartz sand is drawn off from the containers 14 via the metering system 15 by means of sliders in the ratio corresponding to the desired grain composition of the regrind, mixed in the mixing screw 16 and conveyed by the pneumatic conveyor 17 via a line 34 into the discharge silo 18 in the upper container III.
  • the regrind corresponding to the quality of new sand can be withdrawn from the discharge silo 18 via a down pipe 26.
  • the rubble sand processed in this three-stage regeneration device corresponds to new sand in all quality characteristics, so that the regenerate can be used for all common core manufacturing processes.
  • the original beta quartz of the new sand has been converted into alpha quartz due to the thermal treatment in the fluidized bed furnace 9, which is associated with an increase in volume of 0.86 to 1.30%.
  • new sand such a transformation will occur, so that the stresses and cracks that occur in the sand surfaces of the mold and core areas are imaged in the casting surface and require an increased amount of cleaning.
  • the binders separated from the quartz sand granules are mainly excreted by flowing air or gas at several points in the device, namely in the magnetic separator 4, the rotating drums 5 and 10, the fluidized bed oven 9, the screening plant 13 and in the discharge silo 18.
  • the exhaust air carrying the binders or the exhaust gas of the individual units is conducted to a filter system 22 via a line-dotted line 36 and filtered there, so that largely dust-free exhaust air leaves the device.
  • the pilot plant shown in FIG. 2 can be used to carry out regeneration tests with old sands or old sand mixtures.
  • This system is mobile so that it can be transported to the centers of selected supply areas. In terms of workflow and process engineering, it corresponds to a large system according to the invention.
  • the pilot plant shown in FIG. 2 has enough Appropriate procedural safeguards so that the diversity of the existing used sand mixtures can be managed.
  • the pilot plant offers the possibility of further optimizing the design of large plants.
  • the pilot plant shown in FIG. 2 is installed in three containers with internal dimensions of 12020 x 2350 x 2390 mm. All pipelines and electrical supply and control cables are permanently installed within the individual containers, with the containers being connected to one another by means of removable intermediate pieces, quick couplings or plugs. Like the system shown in FIG. 1, the system according to FIG. 2 only requires a power connection, since a gas and compressed air supply is installed in the system itself.
  • the elevator 41 mounted on the side of the containers IV, V and VI has a feed hopper 42 and at its upper end an inlet pipe 43 leading into the upper container VI from above.
  • an old sand container 44 In the upper container VI an old sand container 44, a screw conveyor 45, a rotating drum 46 with a horizontal axis and four sand containers 47 (only two are visible) are accommodated.
  • a fan 48 In the middle container V, a fan 48, a cyclone separator 49, a further fan 50, a fluidized bed furnace 51 with an inlet pipe 52 attached laterally, a fan 53, a grain classifier 54 (Mogensensor), a blast wheel cleaner 55 with an outlet pipe 56 and a riser 57 are accommodated.
  • a grain classifier 54 Mogensensor
  • a gas tank 90 In the lower container IV there is a gas tank 90, a screw conveyor 58 connected to the lower end of the cyclone 49, a rotary drum 59, pneumatic conveyors 60, 61 and 62, storage containers 63 for the various grain fractions, which are connected to a screw conveyor 64 on the outlet side, and another sand tank 65.
  • the rotary drum 46 is divided into three sections by internals arranged perpendicular to the drum axis.
  • the sand tubers are primarily crushed, which is supported by the use of rod-shaped grinding media.
  • This section is separated from the following section of the rotary drum 46 by a perforated plate, so that only free-flowing sand can get into the next section of the drum.
  • the old sand to be regenerated (rubble sand) is pre-selected by grain-to-grain friction, which is supported by a variable grinding media component cleans.
  • the third section of the rotary drum 46 works without grinding media and is used primarily for dedusting the sand.
  • the sand contained in the rotary drum 46 is dried, dedusted and preheated by exhaust air from the fluidized bed furnace 51 which is conducted in countercurrent.
  • the fluidized bed furnace 51 is connected via a line 66 with a throttle valve 67.
  • the rotary drum 59 has the same structure as the rotary drum 46 in the upper container VI and causes the sand to cool to approximately 120 ° C., the combustion residues and the deactivated bentonite to be cleaned, and the sand to be dedusted.
  • Both the rotary drum 46 and the rotary drum 59 are designed so that the sand has a dwell time of approx. 60 min at an output of 0.50 t / h.
  • the sand emerging from the rotary drum 59 is brought by the pneumatic conveyor 60 via a line 71 into the sand container 47 having four chambers.
  • the pneumatic pinch valves 72 arranged on the container 47 it can be selected in which of the chambers of the container 47 the sand supplied via the line 71 is released.
  • This makes it possible to fill one of the chambers of the container 47, while sand is fed to the centrifugal wheel cleaner 55 from another of the chambers via one of the sliders 73 and the downpipe 74.
  • the centrifugal wheel cleaner 55 is designed so that the cleaning process can be repeated four times during the filling time of one of the chambers of the container 47.
  • the sand passes through the container 65 and the pneumatic conveyor 62 and a sand conveying line 75 into another of the chambers of the container 47 or, after the after-cleaning has been completed, into a third of the chambers of the container 47.
  • the cleaned sand is now in the third chamber of the container 47, the previously filled chamber is now empty and the first chamber is filled with sand.
  • the sand cleaned by the centrifugal wheel cleaner 55 and contained in one of the chambers of the container 47 is brought into the classifier 54 via a line.
  • the regrind is broken down into the three most important grain fractions, the separating cuts being selected in such a way that all the usual grain distributions can be produced.
  • the individual grain fractions get into the three-part container 63 through downpipes 76 indicated by dash-dotted lines desired amounts of grain fractions are removed from the container 63 and conveyed into the fourth chamber of the container 47 with mixing via the screw conveyor 64, the pneumatic conveyor 61 and a line 78.
  • the regenerate with the desired particle size distribution can be drawn off from the container 47 via an outlet pipe (not shown).
  • the fluidizing air required for the fluidized bed furnace 51 is supplied by the fresh air fan 53.
  • a second air flow originating from the centrifugal wheel cleaner 55 or from the classifier 54 is fed as cooling air to the rotary drum 59 via a line 80 and finally also reaches the collecting line 79.
  • the exhaust air passes through the fan 50 into the cyclone separator 49 and further via a line 81 to the clean gas fan 48 and finally via a line 82 to the outside.
  • the system is supplied with gas via, for example, a 900 kg tank 90 for liquid gas, which is equipped with all the necessary control and safety fittings.
  • One filling of the tank 90 is sufficient for an operating time of approximately 80 hours.
  • a compressor (not shown) is provided in the lower container IV, for example to the right of the container 65, which supplies conveying air for the pneumatic conveyors 60, 61 and 62 and furthermore the control air for the pneumatic slide valves 73 and 77.
  • the dust fraction separated in the cyclone 49 (if desired, two or more cyclones can also be provided) is conveyed via the screw conveyor 58 to a cellular wheel sluice and discharged through it from time to time.
  • FIGS. 3 to 5 The embodiment of the plant according to the invention shown in FIGS. 3 to 5 is also accommodated in three containers VII, VIII and IX arranged one above the other and is designed for a throughput of 7.5 t / h.
  • the silos for the rubble sand, the regenerate and the classifying unit are accommodated outside the container, which offers the advantage that the capacity of the plant is expanded to 15 t / h, for example, by installing a second regeneration unit (containers VII, VIII and IX) can be.
  • the sand containers 101 and 112 are constructed as a wall construction using the frame construction of the container IX.
  • the supporting structure for receiving the rollers and the drives for the two rotating drums 107 and 109 are at the same time the base structure of containers VII and IX.
  • the fluid bed furnace 108 is integrated in the container VIII and likewise does not have its own support and wall construction.
  • the three containers VII, VIII and IX standing one above the other represent a complete regeneration unit, only the two elevators 105 and 145 and the pneumatic conveyor 150 are arranged externally.
  • An adjustable portion (e.g. 20 to 30%) of the sand conveyed through line 103 is conveyed by a pneumatic conveyor 148, which is arranged in the lower container VII, into a sand container 106 at the top of the upper container IX, whereas the elevator 105 The rest, for example 70 to 80% of the sand stream, is conveyed back into the sand container 101.
  • This arrangement ensures that the sand passes through the centrifugal wheel cleaner 102 three to five times before it reaches the rotary drum 107 for further treatment.
  • the rotary drum and its function correspond to the rotary drum 46 of the embodiment shown in FIG. 2.
  • the pre-cleaned rubble sand passes through a fluidized bed furnace 108 to burn off organic binder residues and then through a rotating drum 109 for subsequent cleaning.
  • Another pneumatic conveyor 150 arranged in the foundation 149 after the rotating drum 109 and below the lower container VII conveys the regenerated sand into the sand container 112 in the upper container IX.
  • the sand enters a second sluice from this sand container 112 derradrier 151, in which a final cleaning process is carried out.
  • the completely regenerated sand passes through a vibration pipe 152 into a pneumatic conveyor 104, which conveys the regenerate, for example, to a mixture silo set up next to the containers VII, VIII, IX.
  • a device for classifying and mixing the individual grain fractions in the desired ratio which can have a structure similar to the corresponding device of the system shown in FIG. 2, can be arranged downstream of the mixture silo or also directly on the pneumatic conveyor 104.
  • a fan 111 for the fluidized bed furnace 108 is also shown in the lower container VII.
  • the remaining air duct lines are only partially shown in Figures 3 to 5 for clarity.
  • the air flow or exhaust gas flow in the system shown in FIG. 5 corresponds in principle to that of FIG. 2.
  • the regenerated sand practically corresponds to new sand and it is possible to adapt these quality characteristics to the respective requirements by classifying and classifying them.
  • regenerate obtained in accordance with the invention is such that that when used in core making with the same additions of binders the same strengths are achieved as with new sand. This takes into account the fact that regenerate yields of 75% of the amount of old sand are achieved, so that a regenerate-new sand mixture of 75:25 can be compared with pure new sand.
  • the following overview summarizes the most important pollutants to be removed during sand regeneration. At the same time it is indicated which degradation is achieved in the individual regeneration stages.
  • the "mechanical I” stage corresponds to the treatment in the rotary drums 5, 46 and 107, the “thermal” process stage to the treatment in the fluidized bed furnace 9, 51 and 108 and the “mechanical II” process stage to the treatment in the rotary drums 10, 59 or 109.
  • the dry pre-cleaning is carried out in a rotating drum (FIGS. 1 and 2) or in a centrifugal wheel cleaner and a rotating drum (FIGS. 3 to 5).
  • a fluidized bed preheater can be provided in addition to the centrifugal wheel cleaner.
  • pre-cleaning rotating drum, centrifugal wheel cleaner with downstream rotating drum and centrifugal wheel cleaner, if necessary with fluid bed preheater
  • post-cleaning the supply air for the fluid bed oven in which thermal regeneration takes place is provided by a fluid bed cooler that cools the sand can be preheated.
  • a centrifugal wheel cleaner which can be used in the context of the invention has a centrifugal wheel rotating around a vertical axis with radial strips, by means of which the sand supplied from above via a pipe coaxial with the axis of rotation is radially accelerated.
  • a fixed impact ring with a V-shaped recessed impact surface is arranged coaxially to the centrifugal wheel, the one from the centrifugal wheel radially accelerated sand hits the lower half of the baffle ring, is deflected there upwards to the upper half of the ring and is deflected radially inward therefrom, whereupon it falls out of the blast wheel cleaner crossing the sand stream moving towards the baffle ring.
  • the sand is cleaned in this centrifugal wheel cleaner by impacting and rubbing the grains of sand against one another, the latter taking place particularly in the area where the sand stream crosses.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
EP85890004A 1984-01-11 1985-01-10 Procédé et dispositif de régénération de sables de fonderie Expired EP0149595B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT85890004T ATE33105T1 (de) 1984-01-11 1985-01-10 Verfahren und vorrichtung zur regenerierung von giessereischuttsanden.
DK212385A DK157740C (da) 1985-01-10 1985-05-14 Fremgangsmaade og apparat til regenerering af stoebesand

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19843400648 DE3400648A1 (de) 1984-01-11 1984-01-11 Vorrichtung und verfahren zur regeneration von giesserei-schuttsand
DE3400648 1984-01-11
DE3400656 1984-01-11
DE19843400656 DE3400656A1 (de) 1984-01-11 1984-01-11 Verfahren zur regeneration von giesserei-schuttsanden

Publications (3)

Publication Number Publication Date
EP0149595A2 true EP0149595A2 (fr) 1985-07-24
EP0149595A3 EP0149595A3 (en) 1986-07-30
EP0149595B1 EP0149595B1 (fr) 1988-03-23

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EP85890004A Expired EP0149595B1 (fr) 1984-01-11 1985-01-10 Procédé et dispositif de régénération de sables de fonderie

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EP (1) EP0149595B1 (fr)
DE (1) DE3561928D1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659255A1 (fr) * 1990-03-08 1991-09-13 Fischer Ag Georg Procede de traitement de regeneration de sable de fonderie usage lie principalement a l'argile.
EP0478881A1 (fr) * 1990-09-24 1992-04-08 Franz Gähler Procédé et dispositif pour l'élaboration de parties fragmentées et/ou fluides de matériaux
DE4111726A1 (de) * 1991-04-10 1992-10-15 Kgt Giessereitechnik Gmbh Verfahren zur mechanischen reinigung von giessereialtsand
EP0465778A3 (en) * 1990-06-28 1993-04-14 Kuenkel-Wagner Gmbh & Co.Kg Process for reclaiming used foundry sand
BE1005692A5 (fr) * 1990-03-08 1993-12-21 Fischer Ag Georg Procede de traitement de regeneration de sable de fonderie usage lie principalement a l'argile.
DE4316610A1 (de) * 1993-05-18 1994-11-24 Gut Gieserei Umwelt Technik Gm Öko-Sandregenerierung mech./pneum. im Chargenbetrieb

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019130747A1 (de) * 2019-11-14 2021-05-20 WEBAC - Gesellschaft für Maschinenbau mbH Anlage und verfahren zum regenerieren von altsand, vorrichtung zum betreiben einer derartigen anlage sowie verwendung von abluft
FI131805B1 (fi) * 2023-03-22 2025-12-09 Resand Oy Menetelmä ja laitteisto tuorehiekan elvyttämiseksi

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1806842A1 (de) * 1968-11-04 1970-05-27 Wilhelm Schwiese Verfahren und Vorrichtung,um Giesserei-Altsande zu regenerieren
DE2252217A1 (de) * 1972-10-25 1974-05-09 Halbergerhuette Gmbh Verfahren zum rueckgewinnen von formgrundstoff
DE2252259A1 (de) * 1972-10-25 1974-05-09 Halbergerhuette Gmbh Einrichtung zum rueckgewinnen von giesserei-formgrundstoff
US4144088A (en) * 1977-01-19 1979-03-13 Kenzler Engineering Company, Inc. Process of reclaiming used foundry sand

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659255A1 (fr) * 1990-03-08 1991-09-13 Fischer Ag Georg Procede de traitement de regeneration de sable de fonderie usage lie principalement a l'argile.
BE1005692A5 (fr) * 1990-03-08 1993-12-21 Fischer Ag Georg Procede de traitement de regeneration de sable de fonderie usage lie principalement a l'argile.
EP0465778A3 (en) * 1990-06-28 1993-04-14 Kuenkel-Wagner Gmbh & Co.Kg Process for reclaiming used foundry sand
EP0478881A1 (fr) * 1990-09-24 1992-04-08 Franz Gähler Procédé et dispositif pour l'élaboration de parties fragmentées et/ou fluides de matériaux
DE4111726A1 (de) * 1991-04-10 1992-10-15 Kgt Giessereitechnik Gmbh Verfahren zur mechanischen reinigung von giessereialtsand
DE4316610A1 (de) * 1993-05-18 1994-11-24 Gut Gieserei Umwelt Technik Gm Öko-Sandregenerierung mech./pneum. im Chargenbetrieb

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DE3561928D1 (en) 1988-04-28
EP0149595B1 (fr) 1988-03-23
EP0149595A3 (en) 1986-07-30

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