EP0465778A2 - Procédé de récupération de sable décoché - Google Patents

Procédé de récupération de sable décoché Download PDF

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Publication number
EP0465778A2
EP0465778A2 EP19910106513 EP91106513A EP0465778A2 EP 0465778 A2 EP0465778 A2 EP 0465778A2 EP 19910106513 EP19910106513 EP 19910106513 EP 91106513 A EP91106513 A EP 91106513A EP 0465778 A2 EP0465778 A2 EP 0465778A2
Authority
EP
European Patent Office
Prior art keywords
sand
stage
air
drying
temperature
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
EP19910106513
Other languages
German (de)
English (en)
Other versions
EP0465778B1 (fr
EP0465778A3 (en
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
Kuenkel Wagner GmbH and Co KG
Fried Krupp AG Hoesch Krupp
Kuenkel Wagner Service und Vertriebs 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
Priority claimed from DE4100520A external-priority patent/DE4100520C2/de
Application filed by Kuenkel Wagner GmbH and Co KG, Fried Krupp AG Hoesch Krupp, Kuenkel Wagner Service und Vertriebs GmbH filed Critical Kuenkel Wagner GmbH and Co KG
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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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 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 rotating drum with mechanical baffles and is dried in it using 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 post-cleaning takes place 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 a high clay content is particularly difficult.
  • clay components in the case of natural sands and adhesive sands
  • a regeneration system can be traced back to the installation of DE-PS 31 10 578 mentioned above, in which the second mechanical cleaning stage of the above-mentioned installation is replaced by a thermal cleaning stage (cf. DE-OS 38 25 361). At least one mechanical regeneration stage is connected upstream and downstream of this thermal regeneration stage.
  • the thermal regeneration stage is designed in such a way that the sand coverings are heated much faster than the grain of sand itself and so thermal stresses are generated in the sand coverings which lead to coking and embrittlement of the non-regenerable coverings.
  • 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 components 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 substantially reduced need for binding agents.
  • the organic and especially the clay-containing binders are removed mechanically in an effective manner. Residues of organic binders remain in the pores of the sand. This leads to a substantial reduction in the surface area of the sand grains, 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 re-heating 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 new method according to claim 1 can be made even simpler and modified for this purpose, wherein considerable savings can still be achieved with regard to the system and the process costs. It has turned out that the tasks and functions that the drying stage fulfills can also be carried out by the first mechanical regeneration stage, since drying takes place extremely quickly there due to the strong mechanical stress on the sand and thus the state of the Already at the beginning of the mechanical regeneration has the consistency of the feed from the upstream drying pen.
  • This advantageous modification of the method according to claim 1 is the subject of claim 5.
  • the new regeneration process 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 used 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 with the aid of hot air.
  • the old sand given in at 5 can have a residual moisture content 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 guided 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 carrier medium required 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 with the air gas mixture via the line 12 and are removed 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.
  • 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 eliminated 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 accumulating and separated from the filter systems at 20 and 20a still contain effective components of bentonite and glossy carbon formers. To a large extent, these dust-like components can be reused in green sand processing. The excess dust-like constituents, on the other hand, are fed to combustion at 26, as mentioned.
  • the amount of air required in the first circuit can be, for example, 7ooo Nm3 / 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, e.g. 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 from 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 the line section 14 via the short-circuit line 17a the feed temperature of the gas mixture in the line 16 can be set to the desired value. In any case, this supply temperature is a maximum of 550 ° C.
  • 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.

Landscapes

  • 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)
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 true EP0465778A2 (fr) 1992-01-15
EP0465778A3 EP0465778A3 (en) 1993-04-14
EP0465778B1 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)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
GB2246974B (en) * 1990-08-16 1994-06-01 Fischer Ag Georg Sand reclamation treatment
EP1745872A2 (fr) * 2005-06-24 2007-01-24 Klein Anlagenbau AG Procédé de traitement de mateiaux de moulage de fondérie
EP1759787A1 (fr) * 2005-08-31 2007-03-07 Klein Anlagenbau AG Procédé pour traiter les sables de moulage

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7097871B2 (en) * 2003-11-19 2006-08-29 Soylink Deflavored vegetable powders, methods of making them, and systems for vegetable milling
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0054288A1 (fr) * 1980-12-16 1982-06-23 Cosworth Research And Development Limited Procédé et dispositif de traitement d'un matériau granuleux
EP0149595A2 (fr) * 1984-01-11 1985-07-24 KGT GIESSEREITECHNIK GmbH Procédé et dispositif de régénération de sables de fonderie
EP0265707B1 (fr) * 1986-10-27 1992-06-03 Förder- und Anlagentechnik GmbH Procédé et installation pour la régénération thermo-mécanique de matières en vrac notamment de sable décoché de fonderie

Family Cites Families (5)

* 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
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
DE3825361A1 (de) * 1988-07-26 1990-02-08 Hermann Jacob Verfahren und anlage zur regenerierung von giessereialtsandgemischen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0054288A1 (fr) * 1980-12-16 1982-06-23 Cosworth Research And Development Limited Procédé et dispositif de traitement d'un matériau granuleux
EP0149595A2 (fr) * 1984-01-11 1985-07-24 KGT GIESSEREITECHNIK GmbH Procédé et dispositif de régénération de sables de fonderie
EP0265707B1 (fr) * 1986-10-27 1992-06-03 Förder- und Anlagentechnik GmbH Procédé et installation pour la régénération thermo-mécanique de matières en vrac notamment de sable décoché de fonderie

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2246974B (en) * 1990-08-16 1994-06-01 Fischer Ag Georg Sand reclamation treatment
DE4212097A1 (de) * 1992-04-10 1993-10-14 Boenisch Dietmar Verfahren und Vorrichtung zum Regenerieren von Giessereisand
US5439044A (en) * 1992-04-10 1995-08-08 Boenisch; Dietmar Method of regenerating foundry sand
DE4224493A1 (de) * 1992-07-24 1994-01-27 Boenisch Dietmar Verfahren und Vorrichtung zum Regenerieren von Giessereisand
EP1745872A2 (fr) * 2005-06-24 2007-01-24 Klein Anlagenbau AG Procédé de traitement de mateiaux de moulage de fondérie
EP1745872A3 (fr) * 2005-06-24 2009-03-11 Klein Anlagenbau AG Procédé de traitement de mateiaux de moulage de fondérie
EP1759787A1 (fr) * 2005-08-31 2007-03-07 Klein Anlagenbau AG Procédé pour traiter les sables de moulage

Also Published As

Publication number Publication date
EP0465778B1 (fr) 1997-10-01
EP0465778A3 (en) 1993-04-14
ATE158731T1 (de) 1997-10-15
US5233765A (en) 1993-08-10
JPH0596340A (ja) 1993-04-20

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