EP0917921A1 - Procédé et appareil pour récupérer du sable à noyaux et de moulage - Google Patents

Procédé et appareil pour récupérer du sable à noyaux et de moulage Download PDF

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Publication number
EP0917921A1
EP0917921A1 EP98121747A EP98121747A EP0917921A1 EP 0917921 A1 EP0917921 A1 EP 0917921A1 EP 98121747 A EP98121747 A EP 98121747A EP 98121747 A EP98121747 A EP 98121747A EP 0917921 A1 EP0917921 A1 EP 0917921A1
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EP
European Patent Office
Prior art keywords
fluidized bed
sand
hot
cooling
molding sand
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
EP98121747A
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German (de)
English (en)
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EP0917921B1 (fr
Inventor
Carmen Scherer
Ralph Koppenhöfer
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Individual
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Publication date
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Publication of EP0917921A1 publication Critical patent/EP0917921A1/fr
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Publication of EP0917921B1 publication Critical patent/EP0917921B1/fr
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    • 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
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying

Definitions

  • the invention relates to a method and an apparatus for Recovering reusable core or molding sand Pieces of used cores or shapes as well as from contaminated Used sand from foundries.
  • Sand molds are generally used in the production of castings and / or sand cores from bound quartz sand are used. After the castings have solidified, they are shaped and cored, the sand being in more or less large pieces bound sand and - as far as the grains of sand themselves detached individually from the fragments - in the form of individual, Grains of sand coated with binder are present. Besides, is the old sand in small quantities with others from the foundry Residues contaminated, e.g. with oxidized metal beads due to metal splashes, with metal chips and Burr remnants from cast iron cleaning.
  • the fluidized bed and the subsequent cooling must be like this be completed that no exhaust gases from the fluidized bed or the cooling section can get into the environment in an uncontrolled manner. This is especially the case with the known large-scale systems Feeding the fluidized bed and removing the treated one Sandes problematic and only with an elaborate and to solve sensitive lock technology.
  • the hot sand is allowed during treatment and cooling only in closed lines or conveyor systems.
  • the prior art is voluminous and multi-stage heat exchanger systems are provided, in which the sand through bundles of vertical pipes in the direction of gravity trickles through, the individual pipes in turn in the different cooling stages of different cooling media flow around.
  • Sand of initially 800 ° C in a reasonable throughput time to be able to cool down at least approximately to room temperature you need large heat exchanger surfaces in different Cooling levels. This can only be done in extensive systems realize that are correspondingly expensive and also high Cause operating costs.
  • the object of the invention is a method and an apparatus for the regeneration of old foundry sand, with whichever of smaller quantities of used sand is economical can be regenerated and rewarded with the also rough shape and core breakage as well as heavily contaminated Used sand without any pretreatment or pre-selection can be treated.
  • This task is based on the generic method or the generic device according to the invention by the characterizing features of claim 1 (method) or by the characterizing features of claim 12 (device) solved.
  • the recovery device 1 shown in the drawing comprises a container 2 in which two lying side by side Chambers are formed, namely a recovery chamber 3rd and a cooling chamber 4.
  • the container 2 has a bottom 5 in the embodiment of rectangular plan, of which four Rise up sidewalls that delimit an interior space 7.
  • Interior 7 is located starting from the floor 5 upwards protruding partition 8, which are between two opposite Side walls extends so that the interior 7 in the two chambers 3, 4 is divided.
  • each one of the chambers 3, 4 cover completely or partially removable.
  • the cover 13, 14 remove so that an upward opening is exposed becomes.
  • the type of cover 13, 14 is arbitrary, with the embodiment Sliding covers are provided, which become the Move opening and closing horizontally according to double arrows 15 to let. The possibility of being largely complete Expose the top of at least the recovery chamber should be used to drain the below described Sieve basket 54 may be given.
  • the top needs the Recovery chamber for ongoing refilling not to be fully exposed with material to be treated.
  • the sliding lid 13 has a filling opening contains, which by an integrated, e.g. weight balanced Filling flap is closable, which by hitting The filling material opens automatically.
  • the side walls 6, the bottom wall 5 and the partition 8 are as far as they enclose the recovery chamber 3, good heat insulation trained to heat loss of the heated To keep the hot fluidized bed as low as possible and to keep the Surface temperatures on the outer surfaces of the recovery chamber on easily tolerable and harmless Reduce values.
  • Heat loss in the area of the lid are harmless, because the ones there Exhaust gases already have their effect in the hot fluidized bed to have.
  • the side walls, the bottom and the lid of simple, i.e. not heat insulated Steel sheet exist, because here in anyway Molding sand contained heat should be dissipated and because of the reduced temperature of the molding sand in the cooling chamber do not expect dangerous temperatures is.
  • first outflow means 17 are provided, which dip into the associated molding sand filling 16 and are surrounded on all sides by it.
  • second outflow means 18 are provided in the cooling chamber 4 from the molding sand filling 16 . Via the outflow means 17, 18 is in the associated molding sand fillings 16, 16th compressed fluid air can be introduced.
  • the outflow means 17, 18 are preferably tubular bodies 22, 22 laid in a suitable distribution , the interior of which, according to arrows 23, is supplied with the compressed fluidizing air from outside the container 2, which then flows into the respective chambers 3, 4 through the outflow openings 24 according to arrows 25 and into the molding sand fillings 16, 16 concerned entry.
  • the two outflow means 17, 18 become independent of one another fed with compressed fluidization air. So they stand first outflow means 17 with an outside of the recovery chamber arranged compressor 26 in connection, wherein in the connection also outside the recovery chamber 3 arranged heater 27 is interposed.
  • the aforementioned components together form a hot air generator 28, the hot air by means of the first air outlet means 17 feeds into the molding sand filling 16 of the recovery chamber 3.
  • the air temperature can at least 550 ° C to 600 ° C amount on the immediate heating element.
  • the actual temperature of the hot fluidized bed is due to certain heat losses somewhat lower and is e.g. 490 to 530 ° C.
  • This Temperature is below the combustion temperature the pyrolysis of binders and accompanying organic substances Formsandes emerging gasification products, so that it is not too a spontaneous combustion of the exhaust gases, quite apart that the concentration of the combustible gas components in the exhaust air for permanent, self-sustaining combustion would be too small.
  • the second outflow means 18 are coupled to a compressor 26 located outside the cooling chamber.
  • the fluidization air compressed by it is transferred into the molding sand filling 16 via the second outflow means 18 without heating the cooling chamber 4 initiated and has the task of cooling the molding sand fluidized in the cooling chamber to about room temperature.
  • the temperature of the air introduced should be at least around ambient temperature or below. If necessary, an additional cooling device can easily be provided in the form of a cooling unit which is dimensioned in terms of output and which cools the cooling gas to a lower temperature. It is also conceivable to inject liquid air, which is provided in a heat-insulated storage container, into the precompressed fluidization air in a targeted manner, in order to cool it down to low temperatures.
  • the recovery device 1 forms within of the two chambers 3, 4 fed in by the arrows 25 Fluidizing air from a fluidized bed, the individual Grains of sand from the molding sand 16, 16 'in a kind of suspended state are displaced and the molding sand has a fluid-like state having.
  • the individual grains of sand are there in lively movement and experiencing an intensive mixing, without leaving the molding sand filling.
  • an overflow 34 between the chambers 3 and 4 can Refill the recovery chamber 3 with new items to be treated due to displacement of regenerated molding sand 16 from the hot fluid bed 32 pass into the cooling fluidized bed 33, where it cooled becomes.
  • the overflow 34 is so formed that the molding sand from the recovery chamber 3rd Depending on the level, passes into the cooling chamber 4. From reaching a certain level of the hot fluidized bed 32 occurs automatically molding sand from the recovery chamber 3 into the cooling chamber 4 over.
  • the overflow 34 forms a permanent connection between the two chambers 3, 4, however, due to a level difference between the two whirling surfaces of the adjacent fluidized beds only in one direction of flow, namely from chamber 3 to chamber 4 is effective. It shouldn't recooled molding sand from the cooling chamber into the one to be heated Hot fluidized bed can get back.
  • the overflow 34 is in the illustrated embodiment in Area of the partition 8 is provided. He is one of the two Chambers 3, 4 connecting opening 35 formed, the lower Boundary wall from an upward-facing edge area 36 of the partition 8 is specified.
  • the opening 35 can for example a window-like recess in the partition 8 be, as is the case with the exemplary embodiment.
  • the recovery device 1 enables the in foundries accruing, partly with foreign particles and substances contaminated old sand and bound molding sand Recycle core and mold fragments to make the molding sand practical to get back in output quality.
  • castings made of aluminum or gray cast iron are often molds made from bonded molding sand and casting cores used.
  • the molding sand becomes a liquid, hardenable Binder added, the amorphous so produced Mix the sand in an openable and closable mold filled with bubbles, the binder and with it the sand mixture hardened in the mold and after opening it the now solidified and dimensionally stable casting mold or the casting core taken from bound molding sand.
  • the cleaned Mold parts and mold cores become a complete mold composed of a certain shape during the casting process of the casting to be cast. After pouring, it has to Cast part can be taken out of the mold and cored.
  • the the casting mold surrounding the outside can be made relatively simply by opening the divisible mold and by shaking Peel off the casting in chunks. Different types of cores can be used Processes are used, mostly the cores but mechanically shaken out of the castings, - knocked or - chiseled, with the seeds in more or less large fragments.
  • Through the recovery device 1 is a very simple separation between the molding sand and the binder possible, so that ultimately more free and binder-free molding sand is present.
  • the two chambers 3, 4 are each filled with molding sand 16, 16 filled from pourable, granular molding sand, the filling height in the recovery chamber 3 being greater than in the cooling chamber 4.
  • the filling height is at least twice the diameter of the largest shaped or core fragments to be treated 37.
  • the decay proceeds - similarly like a melting process - from the outside to what used to be deeper Layers instead.
  • the one there resulting gases occur together with the fluidizing air Arrows 38 on the top of the hot fluidized bed 32. Apart from resistant particles, only the binder-free ones remain and scattered shaped sand grains back.
  • the removal means 43 provided in the exemplary embodiment the cooling chamber 4 contain at least one in a side wall 6 attached removal opening 44, which automatically a Level-dependent removal of molding sand enables. It lies the Transfer opening 35 from the hot fluidized bed opposite, so that the incoming hot molding sand is forced to a certain extent Minimum time to linger in the cooling fluidized bed before moving on The discharge opening can exit again.
  • the removal opening 44 is at a certain height level, so that molding sand can only be removed from the cooling fluidized bed 33 is when the filling level of the cooling fluidized bed 33 reaches this level exceeds.
  • the removal opening 44 forms - similar to the transfer opening 34 in the recovery chamber 3 - one Overflow, but with the removal opening 44 placed lower is than the transfer opening 34. That through the removal opening 44 predetermined maximum level of the cooling fluidized bed 33 is thus lower than that of the hot fluidized bed 32 ⁇ m thereby a return of already cooled molding sand exclude from the cooling fluidized bed 33 into the hot fluidized bed 32.
  • molding sand from the cooling fluidized bed 33 automatically and continuously to the extent the removal opening 44 emerges from the cooling chamber 4, how there is an increase in volume through the expediently also automatic and continuous Transfer of molding sand from the recovery chamber 3 sets.
  • the removed molding sand then only has to be collected and brought to a desired location.
  • the recovery device according to the invention directly set up in the molding shop or in the core shop of a foundry, so that the emerging molding sand without long transport routes must be used again immediately can be.
  • regenerated molding sand before it was reused classify, which presupposes that in addition to in the foundry the molding sand regeneration plant also a molding sand classification plant is provided. It can namely in enrich regenerated molding sand particles of unsuitable size, which the molding sand after frequent reuse in its reduce positive usage properties. And disintegrates a certain proportion when using the molding sand the grains of sand, so that a dust-like fine fraction is created, the air permeability of the molds made from it or cores impaired.
  • a e.g. valve or slide type shut-off device 46 assign This enables a controlled Removal of molding sand e.g. at intervals, which is an advantage is when the means of transport 45 individual transport containers include the one after the other outside of the container 2 the removal opening 44 are placed.
  • the removal opening 44 is expediently designed in this case and merges into a molding sand outlet connection 47.
  • At least partial closure of the removal opening is also essentially at continuous removal of molding sand makes sense, and an uncontrolled outlet of dust-laden exhaust air in the immediate vicinity of the recovery device or excessive intake of outside air through this opening to reduce through the suction device 62. It In such a case, the clear cross section can be useful the discharge opening automatically by a sand accumulation to avoid evasive swing flap at least partially.
  • the removal opening 44 also below a minimum level to be observed the cooling fluidized bed are arranged.
  • opening the shut-off device 46 make sure that the level in the cooling fluidized bed 33 does not fall below a certain level Minimum height that is required to always be sufficient Provide cooling fluidized bed volume.
  • the forcibly closable removal opening as it grows Level of the molding sand or fluidized bed in the cooling chamber is opened in time to overfill the Avoid cooling fluidized bed.
  • the recovery device 1 of the embodiment is further trained so that from the old sand and the core and Mold fragments resistant particles, e.g. Cast breakage, remains of burrs, broken feeders and similar fragments of metal Recycling material of a foundry, can be selected, regardless of how and where these parts in the old sand arrived or what type or how big they are.
  • the recovery device 1 has in a natural way through the hot fluidized bed via a separating agent for selection such resistant particles 53. They sink due to gravity in the hot fluidized bed and collect in the floor area. From there they can be taken out from time to time.
  • the separating means is 52 a strainer basket 54 which can be removed from the hot fluidized bed is provided, in which the resistant particles 53 collect.
  • the strainer basket can be opened from time to time with the lid 13 open the handling device 56 lifted out of the hot fluidized bed become. After emptying the strainer basket, it can again into the fluidizing hot fluid bed like a liquid be lowered.
  • the rectangular screen basket 54 of the illustrated Embodiment has walls with grid-like Structure based on wall openings in the side walls and floor 55 has.
  • Handling device 56 for example a suitable lifting device, can the strainer basket 54, in which there are resistant particles 53 have accumulated, with the lid 13 open lift out of the hot fluidized bed 32 so that the resistant Particles no longer impair the action of the hot fluidized bed 32 can and the decomposition process of the introduced Core and form fragments can take place unhindered.
  • the sieve basket 54 emptied of the resistant particles 53 is then lowered again into the hot fluidized bed 32. While the remaining of the screen basket in the hot fluidized bed 32 is the Handling device 56 uncoupled from the strainer and the Cover 13 closed.
  • the grid in close succession on Sieve basket mounted wall openings 55 allow it Molding sand 16 of the hot fluidized bed 32, almost unhindered Inside of the strainer basket and the inserted core and Mold fragments 37 to act completely.
  • wall openings 55 can have a mesh size of 5 to 10 mm, so that resistant particles up to this size are retained in it become.
  • Smaller resistant particles that are specifically heavier than the fluidized molding sand, e.g. Metal balls or Metal chips are not caught by the screen basket 54 or withheld, but they still don't get in the cooling fluidized bed because of their larger specific Weight can not pass the overflow 34.
  • the hot fluidized bed is horizontal has a greater extension than the addition of the piece Treatments are required.
  • Such an enlargement is primarily for increasing the volume of molding sand and thus to increase the time of the treatment item in the hot fluidized bed or to increase the throughput per unit of time sensible due to the hot fluidized bed. It can be in such a way If the strainer basket is limited to the size of the addition point his; he doesn't need the entire hot fluid bed to fill in. It only has to be ensured that the Really fill in all entered treatment items is caught within the strainer.
  • the resistant particles are made of iron, they can also by a permanent magnet inserted in the sieve basket are held, even if the iron particles are smaller than the mesh size of the screen basket. This can, if they are in a place other than where the permanent magnet is in the sieve basket, through the mesh of the strainer basket fall through and onto the bottom of the hot fluidized bed to lie down.
  • the permanent magnet must be heat resistant, i.e. its Curie point must be above the working temperature of the hot fluid bed lie. If necessary, he must from time to time be magnetized.
  • the exhaust gas discharge device has a suction device 62 and is also with a filter device 63 equipped with a cleaning of the exhaust gases before delivery to the environment.
  • a Sufficiently high suction capacity should be ensured that the top in the recovery chamber and in the cooling chamber, respectively an air pressure below the ambient air pressure prevails, so that outside air continuously in the leaks the chambers 3 and 4 are sucked in but no process gases can exit. If necessary, can also above an extractor hood is installed in both chambers 3 and 4, that ensures clean air at the workplace.
  • the process of dismantling the core and form fragments is proceeding within the hot fluidized bed only on the surface and therefore start slowly. This makes for a certain duration of treatment and Residence time of the old sand and the core and mold fragments in the Hot fluidized bed required, what for small and medium Flows of old sand as well as broken core and broken mold can be accepted.
  • the hot molding sand must also be used are fluidized in the cooling fluidized bed for a relatively long time, until it finally cooled to approximately room temperature is. Taken together, there are large amounts of air through the to move regenerating molding sand through it until it finally cleaned and cooled again.
  • parts of the respective outflow means 17, 18 are arranged in a horizontal distribution in the area of the respective chamber 3, 4 near the floor, in a first arrangement of outflow openings 24 Tubular bodies 22.
  • a further part of the outflow means 17, 18 is arranged in a vertical distribution in the region near the side wall within the respective chamber 3, 4, namely with a second arrangement of tubular bodies 22 . With these tubular bodies 22 the outflow openings are aligned so that the fluidization air entered there flows horizontally into the fluidized bed, which contributes to a considerable improvement in the effect of the fluidized beds.
  • the fluidized sand grains are also subjected to a preferred horizontal movement component, which also enables the fragmentation of the core and shaped fragments introduced into the hot fluidized bed from their side faces.
  • the side inflow means allow an increased air intake and thus an increased cooling capacity compared to a purely bottom entry of the fluidizing air.
  • the fluidizing air whirling up the molding sand should be fed into the hot fluidized bed 32 and / or the cooling fluidized bed 33 at a pressure which is approximately proportional to the height of the fluidized fluidized bed above the respective feed point of the fluidizing air into the fluidized bed.
  • the depth of the fluidized fluidized bed can be approximately equated with a corresponding water depth.
  • the outflow openings arranged in the floor area are all at the same depth within the fluidized bed and can accordingly be supplied with the same air pressure. With a fluidized fluidized bed depth of 80 cm, the feed pressure of the fluidization air supplied at the bottom will be about 80 cm water column.
  • the outflow openings which flow out laterally and are arranged in a trustworthy distribution lie at different depths in the fluidized bed, so that measures for uniform distribution of the fluidizing air in the vertical direction must be taken here.
  • the tubular body 22nd are arranged vertically in the side area, it must be ensured by installing suitable flow resistances for a uniform distribution of the fluidizing air in the height direction. This can be done, for example, by suitable dimensioning of the outflow openings 24, which can be designed as interchangeable nozzle inserts with different flow resistance. Low-resistance nozzle inserts are used below, whereas nozzle inserts with greater flow resistance are used with increasing height.
  • Another way of compensating for the different height of the outflow openings within the fluidized beds is to arrange the outflow openings of the same height - in contrast to the illustration in FIG. 1 - on a horizontally laid tubular body and to lay several tubular bodies in rows in the side wall area, with each individual tubular body can be supplied with the associated optimal fluid pressure via an individually adjustable valve on the part of a uniform pressure source.
  • Such pressure adjustment valves are also expedient on the bottom-side tubular bodies in order to be able to set an optimal fluidization pressure in them as well.
  • the hot air fluidizing the hot fluidized bed 32 is heated outside the recovery chamber 3 by the heating device 27.
  • all or at least some of the first outflow means 17 located in the recovery chamber 3 can be located within the recovery chamber 3 another heating device can be assigned, which is shown in a possible embodiment in FIG. 2.
  • the fluidization air is only heated after the air has been compressed to the required operating pressure and in any case also before the fluidization air flows into the hot fluidized bed.
  • the in the inflow means 17, 22, 22nd integrated heating can be an additional heating. If the effect is sufficient, the heating integrated in the outflow means can also be used as the sole heating device, so that the external heating device 27 could be omitted.
  • a heating device 64 it may not be absolutely necessary to integrate a heating device 64 in all first outflow means 17.
  • some of the tubular bodies can be equipped without such a heating device 64 with a lower heat requirement.
  • the corresponding division - heated and unheated inflow means - takes place as required.
  • the operating temperature of the hot fluidized bed can be regulated by specifically switching on or off individual heating elements.
  • the tubular body 22, 22 of the first outflow means 17 generally have a cylindrical outer contour, the tubular bodies 22 which cooperate with the heating device 64 designed according to Figure 2 so that there is an arcuate cross-sectional shape.
  • the tubular body 22 has an overall channel-like shape and encloses a flow channel 65 of arcuate cross-section.
  • the heating device 64 has a heating element 66 which is cylindrically shaped on the outside and which extends into the tube body 22 Defined concave longitudinal recess 67 is attached with heat transfer in parallel alignment, so that a peripheral portion 68 of its outer surface of the tubular body 22nd is enclosed.
  • a preferably electrically heated heating element 72 is shown arranged in the interior of the heating element 66.
  • the electrically heated heating element 66 gives thermal energy to the tubular body 22 in contact with it from, which is thus heated and causes heating of the air flowing in the flow channel 65.
  • the heating element 66 is not provided by the tubular body 22 covered, exposed circumferential section immediately heat by radiation and convection in the fluidizing molding sand.
  • the heat exchange with the tubular body 22 can be improved by the fact that the tubular body 22nd and the heating element 66 is designed as an integral unit such that in the area of the longitudinal recess 67 there is only a single wall, which at the same time forms a wall section of the tubular body 22 and the heating element 66 forms.
  • the outflow openings 24 are located in the tubular body 22 designed in a channel-like manner on the radially outer, ie cylindrically convex wall section. Expediently, in the case of the horizontally extending outflow means 17, 18, 22, upward outflow openings 24 are generally avoided, so that no molding sand can penetrate into the interior of the tubular body during work breaks.
  • cooling chambers each with an associated one Assign cooling fluidized bed.
  • These cooling chambers can be functional operated in parallel, especially if e.g. two Cooling chambers on opposite sides of the recovery chamber are arranged.
  • Through a multiple arrangement of cooling chambers can a larger volume of the cooling fluidized beds, that is, a longer residence time of the molding sand in the cooling chambers and thus a lower final temperature of the molding sand despite using one only at ambient temperature or cooling air at a slightly lower temperature can be reached.
  • Another alternative is a round one Training of the regeneration device with concentric Arrangement of the fluidized beds.
  • the recovery chamber with a hot fluidized bed is arranged centrally, whereas one or more Cooling chambers concentrically around the recovery chamber arranged with an arcuate fluidization device is or are.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Devices For Molds (AREA)
EP98121747A 1997-11-19 1998-11-16 Procédé et appareil pour récupérer du sable à noyaux et de moulage Expired - Lifetime EP0917921B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29720478U DE29720478U1 (de) 1997-11-19 1997-11-19 Vorrichtung zur Rückgewinnung von im Gießereiwesen verwendetem Formsand
DE29720478U 1997-11-19

Publications (2)

Publication Number Publication Date
EP0917921A1 true EP0917921A1 (fr) 1999-05-26
EP0917921B1 EP0917921B1 (fr) 2002-09-04

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Application Number Title Priority Date Filing Date
EP98121747A Expired - Lifetime EP0917921B1 (fr) 1997-11-19 1998-11-16 Procédé et appareil pour récupérer du sable à noyaux et de moulage

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Country Link
EP (1) EP0917921B1 (fr)
AT (1) ATE223266T1 (fr)
DE (2) DE29720478U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103286260A (zh) * 2013-06-03 2013-09-11 青岛天恒机械有限公司 一种覆膜砂再生系统能量回收的方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0979694B1 (fr) 1998-08-11 2003-07-23 Fata Aluminium Division of Fata Group S.p.A. Dispositif et procédé pour la régénération continue de sable de fonderie
CN117190201A (zh) * 2023-08-22 2023-12-08 北京华能长江环保科技研究院有限公司 一种分体式阴燃装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2586818A (en) * 1947-08-21 1952-02-26 Harms Viggo Progressive classifying or treating solids in a fluidized bed thereof
US3685165A (en) * 1970-10-12 1972-08-22 Combustion Eng Thermal sand reclamation unit
US3976422A (en) * 1974-03-04 1976-08-24 Przedsiebiorstwo Projektowania I Wyposazania Odlewni "Prodlew" Apparatus for reclamation of resinous moulding mixes
GB2044147A (en) * 1978-10-25 1980-10-15 Boc Ltd Cooling method
EP0122029A2 (fr) * 1983-03-09 1984-10-17 Cosworth Research And Development Limited Coulée d'un métal et régénération du sable de fonderie
US4627367A (en) * 1983-12-06 1986-12-09 Coal Industry (Patents) Limited Hot gas generation
EP0628767A2 (fr) * 1993-05-11 1994-12-14 Foster Wheeler Energy Corporation Réacteur à lit fluidisé et procédé d'utilisation du combustible à partir de déchets

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2586818A (en) * 1947-08-21 1952-02-26 Harms Viggo Progressive classifying or treating solids in a fluidized bed thereof
US3685165A (en) * 1970-10-12 1972-08-22 Combustion Eng Thermal sand reclamation unit
US3976422A (en) * 1974-03-04 1976-08-24 Przedsiebiorstwo Projektowania I Wyposazania Odlewni "Prodlew" Apparatus for reclamation of resinous moulding mixes
GB2044147A (en) * 1978-10-25 1980-10-15 Boc Ltd Cooling method
EP0122029A2 (fr) * 1983-03-09 1984-10-17 Cosworth Research And Development Limited Coulée d'un métal et régénération du sable de fonderie
US4627367A (en) * 1983-12-06 1986-12-09 Coal Industry (Patents) Limited Hot gas generation
EP0628767A2 (fr) * 1993-05-11 1994-12-14 Foster Wheeler Energy Corporation Réacteur à lit fluidisé et procédé d'utilisation du combustible à partir de déchets

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103286260A (zh) * 2013-06-03 2013-09-11 青岛天恒机械有限公司 一种覆膜砂再生系统能量回收的方法

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Publication number Publication date
ATE223266T1 (de) 2002-09-15
DE59805394D1 (de) 2002-10-10
EP0917921B1 (fr) 2002-09-04
DE29720478U1 (de) 1998-01-02

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