EP0343272B1 - Procédé et dispositif pour la régénération de sable décoché de fonderie - Google Patents

Procédé et dispositif pour la régénération de sable décoché de fonderie Download PDF

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Publication number
EP0343272B1
EP0343272B1 EP88108436A EP88108436A EP0343272B1 EP 0343272 B1 EP0343272 B1 EP 0343272B1 EP 88108436 A EP88108436 A EP 88108436A EP 88108436 A EP88108436 A EP 88108436A EP 0343272 B1 EP0343272 B1 EP 0343272B1
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EP
European Patent Office
Prior art keywords
sand
batch
receptical
cleaning
sands
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
EP88108436A
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German (de)
English (en)
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EP0343272A1 (fr
Inventor
Peter Ing. Grad. Vdg Pohl
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.)
POHL GIESSEREITECHNIK
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POHL GIESSEREITECHNIK
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Publication date
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Application filed by POHL GIESSEREITECHNIK filed Critical POHL GIESSEREITECHNIK
Priority to EP88108436A priority Critical patent/EP0343272B1/fr
Priority to ES198888108436T priority patent/ES2034025T3/es
Priority to DE8888108436T priority patent/DE3873522D1/de
Priority to AT88108436T priority patent/ATE79062T1/de
Priority to US07/354,841 priority patent/US5045090A/en
Publication of EP0343272A1 publication Critical patent/EP0343272A1/fr
Application granted granted Critical
Publication of EP0343272B1 publication Critical patent/EP0343272B1/fr
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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
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
    • B22C5/044—Devices having a vertical stirrer shaft in a fixed receptacle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S241/00—Solid material comminution or disintegration
    • Y10S241/10—Foundry sand treatment

Definitions

  • the invention relates to a process for the regeneration of foundry sands, in which the old sands are freed of all adhering carbon-containing materials in a first stage by a thermal treatment at 500 to 900 ° C. and then subjected to a mechanical cleaning treatment.
  • a generic method is already known from DE-OS 34 00 656.
  • This known mechanical post-cleaning is disadvantageous in that the use of a rotating drum with baffles does not result in sufficient grain-to-grain friction to remove binder residues (bentonite) adhering to the grain of sand. If the known mechanical cleaning process is carried out with the aid of grinding media, a high proportion of sand grains is destroyed. Since the known method runs continuously, the known method cannot be individually adapted to different degrees of contamination of different foundry sands. As a result, using the known method, it is not possible to regenerate old sands to new sand quality.
  • Waste Disposal Act which came into force in 1987, requires that foundry sands be reprocessed and returned to the production process, since the previous practice of depositing old sands in landfills will no longer be permitted in the future.
  • the invention has for its object to provide a generic method for the regeneration of foundry sands so that a thorough processing of the old sands for new sand quality is possible without significant sand destruction.
  • the invention has for its object to provide a device by means of which thermally pretreated old sands can be mechanically cleaned reliably and gently.
  • the object on which the invention is based is achieved by the invention specified in claim 1.
  • the object on which the invention is based is achieved by the device specified in claim 7.
  • the technical progress achievable with the help of the invention results primarily from the fact that the thermally pretreated used sand is mechanically batch-wise subjected to a rubbing treatment after appropriate pre-cooling, this mechanical rubbing treatment being adjusted to the needs of the respective batch according to the duration and intensity using rotating rubbing elements and taking care also that the grain of sand is not destroyed.
  • the rotating friction elements are moved through the sand batch at an average peripheral speed of 15 m / s.
  • the cleaning duration and the cleaning intensity can be controlled in batches differently, in each case depending on the degree of oolithization of the sand.
  • the mechanical cleaning of the old sands is carried out in batches such that wear-resistant, rotationally driven friction elements are moved through each sand batch, a relative speed occurring between the sand grains and the friction elements, which means that burnt-on binder residues (bentonite) are rubbed off the sand grain surface.
  • the speeds of the reaming tools and thus the relative speed mentioned above are selected so that the quartz sand grains are not destroyed.
  • the sand to be cleaned is first subjected to a thermal treatment at temperatures of 500 to 900 ° C., the temperatures being chosen so that a complete disposal of the gases produced during the combustion process is ensured. After the thermal treatment, the treated sand must not contain any carbon-containing components, because the subsequent mechanical cleaning step would otherwise be impaired.
  • the sand thermally treated at approximately 500 to 900 ° C. is then preferably cooled to approximately 150 to 300 ° C. in order to protect the mechanical sand cleaning device.
  • This thermally pretreated sand is introduced into the interior of a cylindrical container 1 by a feed device 3.
  • this container has a shaft 5 driven by a drive device (electric motor) 11, to which at least one friction element 2 in the form of a cross arm is fastened.
  • a drive device electric motor
  • three layers of transverse arms are provided one above the other on the shaft 5, these layers being arranged offset with respect to one another.
  • the shaft 5 with the transverse arms 2 attached to it is set in rotation.
  • This rotational movement results in a relative movement between the grains of the sand batch and the rotating cross arms (friction elements).
  • the grains of sand are accelerated by the rotating cross arms, with between the Grains of sand and the transverse arms (friction elements) a relative speed occurs, which causes the cleaning effect of the binder (bentonite) burned onto the sand grains.
  • the time duration and the intensity of the rotation of the transverse arms 2 are determined as a function of the degree of oolithization of the batch of used sand treated in each case.
  • the processed batch is discharged through a removal opening 4 provided in the outer wall of the container 1.
  • the circumferential speed of the transverse arms at the outermost circumference should not be less than 5 m / s and not more than 15 m / s. Below 5 m / s there is no satisfactory cleaning effect, and above 15 m / s there is a risk of damage to the quartz grain.
  • the mechanical sand cleaning is preferably carried out in such a way that the rotating cross arms (friction elements) have a peripheral speed of not more than 15 m / s at their free ends, while the peripheral speed of the cross arms in the region of the drive shaft 5 is approximately 5 m / s.
  • the duration of the cleaning treatment varies depending on the degree of oolithization, but is a maximum of 10 minutes per batch. In the context of this invention, “average” peripheral speed is understood to mean the peripheral speed in the central section between the drive shaft and the cross arm end.
  • a nozzle bottom 7 is provided in the container 1, which divides the container 1 into a sand cleaning chamber above the nozzle bottom and an air chamber below the nozzle bottom.
  • a plurality of nozzles 6 are provided in the nozzle base 7. These nozzles 6 are designed so that they do not become clogged by sand. In the illustrated embodiment, only two nozzles 6 are provided in the nozzle base 7.
  • a discharge device 9 for sand and clay particles (dust) accumulated during the cleaning process is provided in the upper area of the container 1.
  • a filter device is connected to the discharge device 9. If compressed air is supplied to the container 1 via the compressed air supply device 8 and enters the sand cleaning chamber of the container 1 through the nozzles 6, a fluidized bed is formed inside the sand cleaning chamber, which aerates the sand batch and discharges the dust particles through the discharge device 9.
  • the quartz grain gets a slightly roughened surface.
  • the sand can be moistened by a device 10 according to a preferred embodiment of the invention by supplying moisture.
  • This device 10 opens into the interior of the sand cleaning chamber of the housing 1.
  • This moisture By adding moisture, an approximately 10% moisture content of the sand is brought about, and the sand is treated in this state.
  • the natural heat of the sand causes the sand to dry because water is evaporated. This water can be replaced again.
  • the drying process of the sand can be accelerated by introducing warm air from the thermal regeneration stage into the container 1.
  • the pH of the regenerated Adjusting the sand can be introduced into the container 1 according to a further preferred embodiment of the invention, acidic or alkali-containing water.
  • the device according to the invention is suitable both for the dry mode of operation and for the wet mode of operation in order to recycle used sand bound to water glass or water glass ester to new sand quality. It goes without saying that the old sand does not need to be pretreated at temperatures up to 800 ° C. In principle, if there are still dust particles in the regenerated sand, the regenerate can e.g. be treated by sighting in the classifier or in a fluidized bed.

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

Claims (12)

  1. Procédé pour la régénération de sables décochés de fonderie, selon lequel, dans une première étape, les sables décochés sont libérés par un traitement thermique de toutes les matières adhérentes contenant du carbone et ensuite soumis à un nettoyage mécanique, lors de ce procédé le traitement thermique s'effectuant à une température située entre 500 et 900°C et le nettoyage mécanique des sables décochés s'effectuant par charges successives, des éléments de frottement (2) rotatifs, résistant à l'usure, passant à travers chaque charge de sables à une vitesse périphérique moyenne de 15 m/s, la durée et l'intensité de ce mouvement étant choisies en fonction du degré d'oolithisation de la charge de sable de manière telle que les grains de sable ne soient pas détruits.
  2. Procédé selon la revendication 1, caractérisé par le fait que le nettoyage mécanique de la charge de sable est effectué à l'état sec et que les particules du sable abrasées lors de ce nettoyage sont éliminées de temps en temps à l'aide d'air comprimé.
  3. Procédé selon la revendication 1, caractérisé par le fait que le nettoyage mécanique de la charge de sable est effectué à l'état humide.
  4. Procédé selon la revendication 3, caractérisé par le fait que pour sécher la charge de sable humide, on utilise de l'air chaud prbvenant de l'étape thermique du traitement.
  5. Procédé selon la revendication 3 ou 4, caractérisé par le fait que le pH de la charge de sable est réglé par addition d'eau à teneur acide ou alcaline.
  6. Procédé selon l'une des revendications 1 à 6, caractérisé par le fait que le nettoyage mécanique d'une charge de sable est effectué en un laps de temps maximal de 10 minutes.
  7. Dispositif pour la mise en oeuvre du procédé selon la revendication 1 comportant un récipient de nettoyage cylindrique (1) et un dispositif pour le traitement thermique du sable décoché, caractérisé par le fait qu'à l'intérieur du récipient cylindrique (1) sont prévus des éléments de frottement (2) entraînés en rotation et réalisés en un matériau résistant à l'usure, et par le fait que sont prévus des dispositifs (3) pour le remplissage du récipient de charges successives de sable décoché, ainsi que des dispositifs (4) pour l'extraction du sable nettoyé du récipient (1).
  8. Dispositif selon la revendication 7, caractérisé par le fait que les éléments de frottement (2) sont réalisés sous la forme de bras transversaux qui sont fixés sur un arbre (5) actionné par un moteur, s'étendant selon l'axe longitudinal du récipient (1).
  9. Dispositif selon la revendication 8, caractérisé par le fait que sont prévus sur l'arbre (5) plusieurs bras transversaux (2) superposés en plusieurs couches.
  10. Dispositif selon l'une des revendications 7 à 9, caractérisé par le fait que, dans la partie inférieure du récipient (1), est prévu un fond à tuyères (7) présentant une pluralité de tuyères (6), ce fond divisant le récipient (1) en une chambre à air disposée sous le fond (7) et une chambre de nettoyage du sable disposée au-dessus du fond (7).
  11. Dispositif selon la revendication 10, caractérisé par le fait qu'à la chambre à air du récipient (1) est raccordé un dispositif (8) d'alimentation en air comprimé et qu'un dispositif (9) pour l'évacuation de l'air et de la poussière du récipient est raccordé à la chambre de nettoyage du sable du récipient (1).
  12. Dispositif selon l'une quelconque des revendications 7 à 11, caractérisé par le fait qu'il est prévu un dispositif (10) pour l'apport d'humidité dans le récipient (1).
EP88108436A 1988-05-26 1988-05-26 Procédé et dispositif pour la régénération de sable décoché de fonderie Expired - Lifetime EP0343272B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP88108436A EP0343272B1 (fr) 1988-05-26 1988-05-26 Procédé et dispositif pour la régénération de sable décoché de fonderie
ES198888108436T ES2034025T3 (es) 1988-05-26 1988-05-26 Procedimiento para la recuperacion de arena usada de fundicion y su equipo correspondiente.
DE8888108436T DE3873522D1 (de) 1988-05-26 1988-05-26 Verfahren und vorrichtung zum regenieren von giessereialtsanden.
AT88108436T ATE79062T1 (de) 1988-05-26 1988-05-26 Verfahren und vorrichtung zum regenieren von giessereialtsanden.
US07/354,841 US5045090A (en) 1988-05-26 1989-05-22 Process and device for reclaiming used foundry sands

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88108436A EP0343272B1 (fr) 1988-05-26 1988-05-26 Procédé et dispositif pour la régénération de sable décoché de fonderie

Publications (2)

Publication Number Publication Date
EP0343272A1 EP0343272A1 (fr) 1989-11-29
EP0343272B1 true EP0343272B1 (fr) 1992-08-05

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ID=8199003

Family Applications (1)

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EP88108436A Expired - Lifetime EP0343272B1 (fr) 1988-05-26 1988-05-26 Procédé et dispositif pour la régénération de sable décoché de fonderie

Country Status (5)

Country Link
US (1) US5045090A (fr)
EP (1) EP0343272B1 (fr)
AT (1) ATE79062T1 (fr)
DE (1) DE3873522D1 (fr)
ES (1) ES2034025T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016000665A1 (fr) 2014-07-03 2016-01-07 SAND TEAM, spol. s.r.o. Procédé de récupération de sable de fonderie utilisé et équipement pour sa mise en œuvre
CN106799459A (zh) * 2017-03-22 2017-06-06 计霞蓉 一种具有增强初混功能的混砂机
CN111408685A (zh) * 2020-03-30 2020-07-14 滁州市兴义装备模具制造有限公司 一种砂型铸造铝合金铸坯生产用原料的搅拌混合装置

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US5211215A (en) * 1990-02-14 1993-05-18 Sommer Hermann W Process for neutralizing regenerated sand
CH682986A5 (de) * 1990-03-08 1993-12-31 Fischer Ag Georg Verfahren zur chargenweisen Regenerierbehandlung von überwiegend tongebundenem Giesserei-Altsand.
CH682056A5 (fr) * 1990-03-08 1993-07-15 Fischer Ag Georg
CH682641A5 (de) * 1990-11-23 1993-10-29 Fischer Ag Georg Verfahren zum Trennen der Bentonit- und Kohlenstoffträgerpartikel von dem bei der Altsandregenerierung auf mechanischem Wege gewonnenen Staub.
DE4111726C2 (de) * 1991-04-10 1994-02-24 Kgt Giessereitechnik Gmbh Verfahren zur mechanischen Reinigung von Gießereialtsand
US5236133A (en) * 1991-12-04 1993-08-17 Lundquist Lynn C Method of container label removal
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
DE4315893A1 (de) * 1992-07-24 1994-11-17 Boenisch Dietmar Verfahren und Vorrichtung zum Regenerieren von Gießereisand
DE4237838A1 (de) * 1992-11-10 1994-05-11 Badische Maschf Gmbh Verfahren und Vorrichtung zum Regenerieren von Gießereialtsand
DE4322947B4 (de) * 1992-11-27 2006-02-02 Förder- und Anlagentechnik GmbH Anordnung zur Verbesserung der Verarbeitungsgeigenschaften von Sanden
DE4301646C2 (de) * 1993-01-22 1995-08-03 Klein Alb Gmbh Co Kg Vorrichtung zum Regenerieren von Gießereisand
DE4318136A1 (de) * 1993-06-01 1994-12-08 Badische Maschf Gmbh Verfahren zum Regenerieren von Gießerei-Altsanden
DE4321297C2 (de) * 1993-06-26 1999-06-17 Krc Umwelttechnik Gmbh Verfahren zur nassen Regenerierung von mit Verunreinigungen und Schadstoffen belasteten körnigen Schüttgütern
US6631808B2 (en) 2001-08-07 2003-10-14 Particle And Coating Technologies, Inc. Air classifier system for the separation of particles
US6691765B2 (en) * 2001-08-07 2004-02-17 Noram Technology, Ltd. Products for the manufacture of molds and cores used in metal casting and a method for their manufacture and recycle from crushed rock
KR100402412B1 (ko) * 2001-10-25 2003-11-01 기원금속(주) 주물사 재생장치 및 그 재생방법
DE112007000190A5 (de) * 2006-01-18 2008-12-04 HOS Hottinger Systems GbR (vertretungsberechtigter Gesellschafter: Walter Leo Pöhlandt, 68782 Brühl) Verfahren und Vorrichtung zur Wiederaufbereitung einer Kern-Formsandmischung
KR100664290B1 (ko) * 2006-02-27 2007-01-04 엘지전자 주식회사 의류 건조기의 건조 드럼
DE102011081530A1 (de) 2011-08-25 2013-02-28 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Regenerierung des Sandes von Sandformen und -kernen
PL2666562T3 (pl) * 2012-05-25 2014-12-31 Technofond Giessereihilfsmittel Gmbh Urządzenie regeneracyjne
DE102012105257B4 (de) 2012-06-18 2018-06-07 HARTING Electronics GmbH Isolierkörper eines Steckverbinders
DE102013001801B4 (de) 2013-02-01 2014-12-18 Bernd Federhen Verfahren und Vorrichtung zur mechanischen Behandlung von Gießereisanden
EP2837424A1 (fr) * 2013-08-13 2015-02-18 TARTECH eco industries AG Briseur de scories
EP3083102B1 (fr) 2013-11-25 2018-11-14 Technofond Gießereihilfsmittel GmbH Dispositif de régénération et son utilisation
CN103909216B (zh) * 2014-04-23 2016-04-20 湖州双金机械配件有限公司 一种消失模铸造生产线砂处理系统
CN103909215B (zh) * 2014-04-23 2017-01-25 湖州双金机械配件有限公司 一种消失模铸造生产线型砂再生的方法及装置
CN104759584A (zh) * 2015-04-22 2015-07-08 莒州集团有限公司 水玻璃废砂再生优化处理方法及系统
JP6354728B2 (ja) 2015-10-19 2018-07-11 トヨタ自動車株式会社 中子砂の再利用方法及び再利用装置
WO2018157060A2 (fr) * 2017-02-24 2018-08-30 KB Foundry Services, LLC Procédé et système de nettoyage de sable
CN106862483B (zh) * 2017-03-22 2019-07-09 青岛三运通用机械有限公司 一种用于混制设备的多级初混盘
CN107824743B (zh) * 2017-10-11 2019-06-11 武汉纺织大学 一种水玻璃铸造旧砂原位再生方法及装置
CN110076288A (zh) * 2019-04-30 2019-08-02 安徽全柴天和机械有限公司 一种旧砂机械再生的砂粒摩擦器
CN110560630B (zh) * 2019-09-16 2021-02-05 溧阳市新明机械配件制造有限公司 一种带有清料机构的混砂机

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US4205796A (en) * 1978-03-03 1980-06-03 Rexnord Inc. Vibrating reclaimer of foundry mold material
DE3103030C2 (de) * 1981-01-30 1984-05-03 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren zur Gewinnung von Gießereisand aus gebrauchtem Gießereisand
DE3400656A1 (de) * 1984-01-11 1985-07-18 Delta Engineering Beratung und Vermittlung Gesellschaft mbH, Irdning Verfahren zur regeneration von giesserei-schuttsanden
JPH0683795B2 (ja) * 1986-03-18 1994-10-26 ホソカワミクロン株式会社 ボ−ルミル
DE3636479A1 (de) * 1986-10-27 1988-05-05 Foerder & Anlagentechnik Gmbh Verfahren und anordnung zur thermo-mechanischen regenerierung von schuettguetern, insbesondere von giesserei-altsand

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016000665A1 (fr) 2014-07-03 2016-01-07 SAND TEAM, spol. s.r.o. Procédé de récupération de sable de fonderie utilisé et équipement pour sa mise en œuvre
CN106799459A (zh) * 2017-03-22 2017-06-06 计霞蓉 一种具有增强初混功能的混砂机
CN106799459B (zh) * 2017-03-22 2019-03-19 丁文铃 一种具有增强初混功能的混砂机
CN111408685A (zh) * 2020-03-30 2020-07-14 滁州市兴义装备模具制造有限公司 一种砂型铸造铝合金铸坯生产用原料的搅拌混合装置

Also Published As

Publication number Publication date
ES2034025T3 (es) 1993-04-01
DE3873522D1 (de) 1992-09-10
US5045090A (en) 1991-09-03
ATE79062T1 (de) 1992-08-15
EP0343272A1 (fr) 1989-11-29

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