EP0465778B1 - Procédé de récupération de sable décoché - Google Patents

Procédé de récupération de sable décoché Download PDF

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Publication number
EP0465778B1
EP0465778B1 EP91106513A EP91106513A EP0465778B1 EP 0465778 B1 EP0465778 B1 EP 0465778B1 EP 91106513 A EP91106513 A EP 91106513A EP 91106513 A EP91106513 A EP 91106513A EP 0465778 B1 EP0465778 B1 EP 0465778B1
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EP
European Patent Office
Prior art keywords
sand
air
temperature
led
process according
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.)
Expired - Lifetime
Application number
EP91106513A
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German (de)
English (en)
Other versions
EP0465778A3 (en
EP0465778A2 (fr
Inventor
Ekart Dr. Dipl.-Ing. Schaarschmidt
Horst Dipl.-Ing. Rademacher
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.)
Fried Krupp AG Hoesch Krupp
Kuenkel Wagner Service und Vertriebs GmbH
Original Assignee
Fried Krupp AG Hoesch Krupp
Kuenkel Wagner Service und Vertriebs GmbH
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Filing date
Publication date
Priority claimed from DE4100520A external-priority patent/DE4100520C2/de
Application filed by Fried Krupp AG Hoesch Krupp, Kuenkel Wagner Service und Vertriebs GmbH filed Critical Fried Krupp AG Hoesch Krupp
Publication of EP0465778A2 publication Critical patent/EP0465778A2/fr
Publication of EP0465778A3 publication Critical patent/EP0465778A3/de
Application granted granted Critical
Publication of EP0465778B1 publication Critical patent/EP0465778B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22C5/18—Plants for preparing mould materials

Definitions

  • the invention relates to a method for regenerating old foundry sands with organic and inorganic binder constituents or the like, in particular with a high proportion of clay, especially bentonite, with the features of the preamble of claim 1.
  • a method of this kind is e.g. known from DE-OS 34 00 656.
  • the old sand is fed via a magnetic separator to a rotary drum with mechanical baffles and dried in it with the aid of hot air passed through the drum.
  • the drum serves to crush the sand components, if necessary, and to mechanically process the binder components adhering to the sand grains by friction.
  • grinding media present in the rotary drum can also be used.
  • This mechanical cleaning can also be carried out in a separate stage with the aid of an impact separator, as are known for example from DE-PS 28 56 536 or DE-PS 31 10 578.
  • the sand is passed through a fluidized bed furnace in the known method, in which the chemical components, such as organic binders, are burned off at temperatures of around 800 ° C.
  • the hot sand then passes through a cooling drum, in which it is cleaned and in which the sand is cooled to room temperature with the aid of cooling air.
  • the sand can then be classified and reused.
  • the hot exhaust air from the fluid bed furnace is used to dry the sand, which is fed to the dryer drum via an exhaust air filter and, after renewed filtering, is discharged into the atmosphere together with all gaseous pollutants.
  • the exhaust air from the cooler and the air used to transport the sand are also discharged into the atmosphere after passing through the filter.
  • old sands can contain chemical additives. especially organic binders as well as inorganic binders, such as clay components.
  • organic binders as well as inorganic binders, such as clay components.
  • the regeneration of old sands with high clay content is particularly difficult.
  • clay components in the case of natural sands and adhesive sands
  • montmorillonite main component of the bentonite
  • mullite or aluminum silicate an important component of the chamotte.
  • a regeneration system can be traced back to the system of DE-PS 31 10 578 mentioned above, in which the second mechanical cleaning stage of the above-mentioned system is replaced by a thermal cleaning stage (cf. DE-OS 38 25 361).
  • This thermal regeneration stage is preceded and followed by at least one mechanical regeneration stage.
  • the thermal regeneration stage is designed in such a way that the sand wraps are heated much faster than the grain of sand itself and so thermal stresses are generated in the sand wrappings that lead to coking and embrittlement of the non-regenerable wrappings.
  • the heating gas stream itself has a much higher temperature than is required for thermal regeneration of the sand mixture and is around 1000 ° C. or higher.
  • the contact time between the sand to be treated and the hot gas stream is so short that the grains of sand are not heated above a temperature of about 200 ° to 300 °.
  • the supply temperature of the heating gas flow is so high that aluminum flicker is instantly melted or gasified.
  • the method according to the present invention aims in a substantially different direction.
  • the used sand is not heated to a high degree.
  • the residual material that accumulates as dust still contains all bindable dry constituents and can be reintroduced into the foundry process.
  • the process temperature is limited in all stages so that there is no fireclaying or burning out of organic components. This significantly reduces the need for thermal energy. Above all, however, an increase in the pH of the sand is avoided and the porosity of the quartz sand surface is considerably reduced, so that when the regenerated sand is reused, there is a significantly reduced need for binding agents.
  • the organic and especially the clay-containing binders are removed mechanically in an effective manner. Remains of organic binders remain in the pores of the sand. This leads to a substantial reduction in the surface size of the grains of sand, ie to a smoother surface, which results in the lower need for binding agents.
  • the temperature is limited to a maximum of 550 ° C.
  • Another advantage is that the process air or the air gas mixture formed during the treatment is passed through the drying stage and through the (first) mechanical cleaning stage directly downstream, through a drying filter downstream of the regeneration stage and an air heater. In this way, the process heat is largely preserved.
  • a predetermined proportion of the air gas mixture is continuously branched off from the circuit and fed to an afterburning.
  • the afterburning can also serve to inertize the excess portions of the dust-like components separated from the sand. Such inerting is absolutely necessary for ecological reasons before storing these components in a landfill.
  • the thermal energy that is obtained when the branched-off air gas mixture is burned and when the excess dust constituents are re-burned is available for heating or reheating the circulated air gas mixture, so that the regenerated sand is of good quality and its reuse is therefore not restricted.
  • Process control is also obtained which satisfies all ecological requirements.
  • the regenerated sand obtained with the new process also enables the binders to be used sparingly.
  • the method is also particularly inexpensive for reasons of energy consumption and also for reasons of cost.
  • the regeneration process according to Figure 1 is multi-stage.
  • the used sand represented by the arrow 2 at 1
  • a magnetic separator 3 or the like in order to separate castings and other metal parts present in the used sand at 4.
  • the waste sand treated in this way is fed to a drying stage at 5.
  • This expediently consists of a mill drying plant in which the sand passing through is kept in motion, agglomerates of sand are crushed and the sand is dried using hot air.
  • the old sand given in at 5 can have a residual moisture of 2 to 3%. This moisture is removed as completely as possible in the mill drying system. Throwing blades or the like can take over the movement of the sand in the mill drying system.
  • Various suitable mill drying systems are known, so that a detailed description is not necessary.
  • the drying air added to the system is conducted in a circulatory system 7.
  • the air is heated in an air heater 8 and fed to the drying system 6 at 9.
  • the temperature of the drying air is set to a maximum of 500 ° to 550 ° C.
  • the used sand is heated, crushed and dried in the mill drying plant.
  • the temperature of the old sand when leaving the drying system 6 can be approximately 120 °.
  • the exhaust air exits the drying facility at 10 and enters a first mechanical cleaning or regeneration system 11 immediately downstream of this.
  • a single- or multi-cell impact separator is used in stage 11, as already mentioned in the introduction to the description .
  • the required carrier medium for the sand is fed via line 10 to stage 11.
  • the carrier medium consists of the air gas mixture that forms in the drying zone 6.
  • the carrier medium is preferably also set to an elevated temperature of up to a maximum of 250 ° C.
  • Heated air from line 9 can be used to adjust the temperature branched off via valve 17 and line 16 and admixed to the air gas mixture in line 10.
  • the air gas mixture discharged from stage 11 is fed via line 12 to a dry filter 13 and from there returns via line 14 to the heater 8, from which the air gas mixture is fed back to the process.
  • the oversized grains obtained in stage 11 during mechanical cleaning are excreted at 18. Dust-like constituents are discharged into the filter 13 via the line 12 with the air gas mixture and are separated from the circuit at 20.
  • a portion of the air gas mixture from the circuit 7 that can be adjusted via valve 28 is continuously branched off via line 27 and subjected to combustion in the afterburner 25.
  • the afterburning device 25 is also given such excess portions of the dust-like constituents, which are separated from the filter at 20, at 26. Through the burning process, these components are brought into an inert state so that they can be excreted at 32 and deposited in a landfill in an ecologically harmless manner.
  • the thermal energy obtained in the afterburning device 25 is fed via the exhaust gases according to line 30 to a heat exchanger and, if appropriate, an additional heat source in the heater 8. After the heat has been released, the exhaust gases can be fed to the chimney at 31, if necessary after appropriate cleaning.
  • the partial quantity of the air gas mixture discharged at 27 can be replaced by fresh air in the circuit 7.
  • the sand prepared in this way can now be cooled directly and reused.
  • a second mechanical cleaning stage 40 to which a separate air circuit 47, 48 is assigned, which has a corresponding filter system 13a for separating the dust-like components at 20a.
  • the mechanical cleaning arrangement 40 can be designed in a manner corresponding to the cleaning arrangement 11. Remaining oversized parts at 18a can also be removed here.
  • the required supplementary air can be supplied to the first air gas circuit via valve 50 and line 49 from the second circuit 47, 48, which itself is supplementary air is fed via valve 52 at 51.
  • the sand processed in stage 11 comes with its residual heat of e.g. 120 to 200 ° C in the second mechanical treatment stage 40. This inlet temperature of the sand determines the process temperature in this stage. At this stage the sand cools down to e.g. 100 ° C and enters the downstream cooler 52 at this temperature at 45.
  • a separate cooling circuit is used to further cool the sand, e.g. a water cooling circuit 51, to which the heat via the heat exchanger 53 and e.g. air cooling 54 is withdrawn.
  • the fine particles that accumulate and are separated from the filter systems at 20 and 20a still contain effective components of bentonite and shiny carbon formers. These dust-like components can therefore to a large extent be reused in green sand processing.
  • the excess dust-like constituents are fed to the combustion at 26, as mentioned.
  • the amount of air required in the first circuit can be, for example, 7ooo Nm 3 / h with a capacity of 5 t / h.
  • the amount branched off via line 27 is approximately 50 Nm 3 / h.
  • the temperature in the milling dryer 6 is preferably between 120 and 500 ° C, while the process temperature in stage 11 is suitably kept below 250 ° C.
  • the residence time of the sand in the dryer 6 is about 1 hour and in the cleaning stages 11 and 40 each about 1/2 to 1 hour.
  • the speed of the carrier medium when using pneumatic-mechanical regeneration stages, for example impact separators in stages 11 and 40 is between 20 and 40 m / sec.
  • the heater 8 expediently consists of a heat exchanger downstream of the afterburning device 25 and a switchable heating device.
  • the arrangement according to FIG. 2 differs from that according to FIG. 1 only in the area between the magnetic separator 3 and the first mechanical cleaning or regeneration system 11, which is connected directly downstream of the magnetic separator 3 in this embodiment.
  • the heated air of the hot gas circuit 7 is fed directly to the first mechanical regeneration stage 11 and, as before, fed back to the closed circuit system 7 via the line 12.
  • Via valve 17, e.g. by adding a portion of the cooler gas mixture from line section 14 via short-circuit line 17a the feed temperature of the gas mixture in line 16 can be set to the desired value. In any case, this supply temperature is a maximum of 550 ° C. However, the feed temperature of the gas mixture to the first mechanical cleaning stage is preferably set to a value which does not exceed 250.degree.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)

Claims (7)

  1. Procédé de récupération sèche de sable décoch, qui contient des composants de liant organiques et inorganiques, tels que des fractions d'argile, en particulier des fractions de bentonite, dans lequel le vieux sable est maintenu en mouvement avec une humidité résiduelle d'abord dans une étape de séchage après élimination de résidus métalliques, les amas de sable sont broyés et l'humidité résiduelle du sable est éliminée à l'aide d'air chauffé, le sable séché est nettoyé mécaniquement dans au moins une étape de nettoyage, les composants sous forme de poussières résultants sont écartés au moyen d'un flux d'air et le sable nettoyé et séché est alors refroidi à la température de traitement, caractérisé en ce que l'air chauffé à une température nettement au-dessous de la température de frittage des liants contenant de l'argile et au-dessous de la température de combustion des liants organiques est amené jusqu'à l'étape de séchage et la température d'arrivée d'air est limitée au maximum à 550° C, le sable séché est amené directement à l'étape de nettoyage mécanique et le mélange air-gaz issu de l'étape de séchage est de nouveau amené dans le circuit fermé par l'intermédiaire de l'étape de nettoyage mécanique consécutive, d'un filtre sécheur et d'un dispositif de chauffage à l'étape de séchage.
  2. Procédé selon la revendication 1, caractérisé en ce qu'une fraction prédéterminée est dérivée en continu du circuit du mélange air-gaz et amenée à une étape de post-combustion, et en ce que l'énergie thermique produite lors de l'étape de post-combustion est conduite jusqu'au dispositif de chauffage.
  3. Procédé selon la revendication 1, caractérisé en ce que le séchage est réalisé lors d'une étape de broyage-séchage .
  4. Procédé selon la revendication 1 à 3, caractérisé en ce que même les fractions excédentaires des composants sous forme de poussières et/ou des grains trop gros séparés du sable lors de l'étape de nettoyage mécanique sont amenées à des fins d'inertisation jusqu'à l'étape de post-combustion.
  5. Procédé selon la revendication 1, caractérisé en ce que l'air chauffé à une température maximale de 250°C est amené jusqu'à la première étape de nettoyage mécanique formée d'un séparateur à chocs à une ou plusieurs cellules.
  6. Procédé selon la revendication 5, caractérisé en ce que la première étape pneumatique et mécanique est directement suivie d'une deuxième étape de nettoyage, étape de nettoyage fonctionnant de préférence de manière pneumatique et mécanique, dont l'air de traitement est amené au moyen d'un filtre sécheur dans un circuit fermé séparé.
  7. Procédé selon la revendication 6, caractérisé en ce que la quantité dérivée en continu du circuit fermé du mélange gazeux chauffé et amenée jusqu'à l'étape de post-combustion, est remplacée au fur et à mesure qu'elle sort du circuit fermé séparé de la seconde étape de nettoyage mécanique.
EP91106513A 1990-06-28 1991-04-23 Procédé de récupération de sable décoché Expired - Lifetime EP0465778B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4020576 1990-06-28
DE4020576 1990-06-28
DE4100520 1991-01-10
DE4100520A DE4100520C2 (de) 1990-06-28 1991-01-10 Verfahren zum Regenerieren von Gießerei-Altsanden

Publications (3)

Publication Number Publication Date
EP0465778A2 EP0465778A2 (fr) 1992-01-15
EP0465778A3 EP0465778A3 (en) 1993-04-14
EP0465778B1 true EP0465778B1 (fr) 1997-10-01

Family

ID=25894545

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91106513A Expired - Lifetime EP0465778B1 (fr) 1990-06-28 1991-04-23 Procédé de récupération de sable décoché

Country Status (4)

Country Link
US (1) US5233765A (fr)
EP (1) EP0465778B1 (fr)
JP (1) JPH0596340A (fr)
AT (1) ATE158731T1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH681283A5 (fr) * 1990-08-16 1993-02-26 Fischer Ag Georg
DE4212097A1 (de) * 1992-04-10 1993-10-14 Boenisch Dietmar Verfahren und Vorrichtung zum Regenerieren von Giessereisand
DE4224493A1 (de) * 1992-07-24 1994-01-27 Boenisch Dietmar Verfahren und Vorrichtung zum Regenerieren von Giessereisand
US7097871B2 (en) * 2003-11-19 2006-08-29 Soylink Deflavored vegetable powders, methods of making them, and systems for vegetable milling
DE102005029742B3 (de) * 2005-06-24 2006-08-24 Klein Anlagenbau Ag Verfahren zum Behandeln von Gießereiformstoffen
DE102005041519A1 (de) * 2005-08-31 2007-03-01 Klein Anlagenbau Ag Verfahren zum Behandeln von Gießereiformstoffen
US20070160728A1 (en) * 2005-10-13 2007-07-12 Noel Rudie Gluten-free food products including deflavored bean powder
US7908765B2 (en) * 2006-12-22 2011-03-22 Collette Nv Continuous granulating and drying apparatus

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177952A (en) * 1978-04-24 1979-12-11 National Engineering Company Impact scrubber
EP0132493B1 (fr) * 1980-12-16 1988-06-15 Cosworth Research And Development Limited Appareil et procédé pour la régénération de sable de fonderie usé
DE3110578A1 (de) * 1981-03-18 1982-09-30 Hermann 2105 Seevetal Jacob Vorrichtung zur reinigung von giessereialtsand
US4415444A (en) * 1981-10-08 1983-11-15 General Kinematics Corporation Air cooling system for a vibratory sand reclaiming apparatus
DE3400656A1 (de) * 1984-01-11 1985-07-18 Delta Engineering Beratung und Vermittlung Gesellschaft mbH, Irdning Verfahren zur regeneration von giesserei-schuttsanden
EP0149595B1 (fr) * 1984-01-11 1988-03-23 KGT GIESSEREITECHNIK GmbH Procédé et dispositif de régénération de sables de fonderie
DE3636479A1 (de) * 1986-10-27 1988-05-05 Foerder & Anlagentechnik Gmbh Verfahren und anordnung zur thermo-mechanischen regenerierung von schuettguetern, insbesondere von giesserei-altsand
DE3825361A1 (de) * 1988-07-26 1990-02-08 Hermann Jacob Verfahren und anlage zur regenerierung von giessereialtsandgemischen

Also Published As

Publication number Publication date
EP0465778A3 (en) 1993-04-14
JPH0596340A (ja) 1993-04-20
ATE158731T1 (de) 1997-10-15
US5233765A (en) 1993-08-10
EP0465778A2 (fr) 1992-01-15

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