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EP0456027B1 - Procédé pour la régénération thermique de sable de fonderie décodé et pour le traitement des poussières formées pendant sa circulation - Google Patents

Procédé pour la régénération thermique de sable de fonderie décodé et pour le traitement des poussières formées pendant sa circulation Download PDF

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Publication number
EP0456027B1
EP0456027B1 EP91106468A EP91106468A EP0456027B1 EP 0456027 B1 EP0456027 B1 EP 0456027B1 EP 91106468 A EP91106468 A EP 91106468A EP 91106468 A EP91106468 A EP 91106468A EP 0456027 B1 EP0456027 B1 EP 0456027B1
Authority
EP
European Patent Office
Prior art keywords
dust
fluidized bed
sand
combustion
post
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
EP91106468A
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German (de)
English (en)
Other versions
EP0456027A1 (fr
Inventor
Volker Godderidge
Walter Stuzmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kgt Giessereitechnik GmbH
Original Assignee
Kgt Giessereitechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Kgt Giessereitechnik GmbH filed Critical Kgt Giessereitechnik GmbH
Priority to AT91106468T priority Critical patent/ATE100742T1/de
Publication of EP0456027A1 publication Critical patent/EP0456027A1/fr
Application granted granted Critical
Publication of EP0456027B1 publication Critical patent/EP0456027B1/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
    • B22C5/08—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
    • 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 method for the thermal regeneration of used sand accumulating in foundries according to the preamble of claim 1.
  • Waste foundry sand as it occurs in the processing of used sand molds, must first be processed at least roughly, whereby large lumps of sand are broken up with mechanical means, such as hammer mills, castings are removed via magnetic separators and the dust components accumulated during mechanical processing are separated off using air classifiers before, after further mechanical treatment steps, if necessary, thermal treatment of the old sand can be carried out.
  • Fluidized bed processes are used in a large number of industrial processes in which a fluidized bed is formed within a fluidized bed furnace consisting of dust or fine to coarse-grained solids and an inflow or fluidized gas blown in from below, in which both exothermic and endothermic processes take place.
  • Dusty coal for example, is introduced into the fluidized bed as fine-grained solids for specifying exothermic reactions.
  • a known fluidized bed process with an exothermic reaction in which, however, no fuel in the form of a solid substance is used for heating the fluidized bed, is the roasting of sulfidic ores, such as pyrites, galena or zinc blende within such a fluidized bed.
  • Known Fluidized bed processes with endothermic reaction are drying, calcining, sintering of dusty to granular bulk material.
  • a fluidized bed of introduced trickle material such as coal, garbage, metallic dusts or the like, is formed within the fluidized bed furnace in the region of the furnace floor for an exothermic combustion process.
  • the furnace floor is designed as a gassing floor and has a discharge opening for the reaction product in the middle at the end of a conically tapering section.
  • Free-flowing solids such as old-fashioned resin-containing sand, but also quartz sand or clay, are passed through a pipe system acting as a heat exchanger inside the fluidized bed furnace, in order to be finally fed to an external collecting container from which the regrind can then be drawn off.
  • This known fluidized bed furnace arrangement is particularly suitable for processing or converting specific heavy substances, e.g. for roasting sulfidic ores.
  • the known method can be used with a correspondingly modified device structure for processing and converting specifically light substances, e.g. of resin-containing binders or binder residues, such as those adhering to used sand.
  • a device is known in which the material taken off is subjected to a wind sifting, the air being heated directly by at least part of the solid material before being brought together with the material. After merging with the withdrawn fluidized bed material, the air absorbs heat from it, after which it is fed back to the combustion chamber of the fluidized bed combustion system with the fine fraction of the layered material via a delivery pipe additionally subjected to air.
  • the present invention has for its object to provide a method for inerting dusts from the old sand accumulating in foundries, such as in the reprocessing by separating cast iron and sand, sieving, classifying, mixing and the like Mechanical comminution measures arise, while at the same time minimizing the energy balance.
  • the mechanical treatment of the sand preceding this thermal treatment enables the dusts to be easily separated for the process sequence according to the invention, for example by suctioning and separating them in filter systems known per se.
  • the dusts consist essentially of a fine-grained quartz fraction, optionally made of other inorganic substances such as clay particles and a not inconsiderable organic component made of dusty resin compounds. Such dust mixtures would have to be brought to special landfills if they were not returned to the process cycle, which means that they can only be disposed of at considerable expense.
  • the inertization of the dusts according to the invention makes it unnecessary to place them in hazardous waste landfills and further improves the energy balance for the thermal treatment step of the old sand.
  • the dusts such as those obtained from the sand cycle of a foundry, are blown in easily over the bottom of the fluidized bed furnace into the fluidized bed by means of heat exchangers preheated air as a means of transport, which serves as the inflow gas for the fluidized bed.
  • the inertization of the blown-in dust, insofar as these are incombustible components thus takes place practically simultaneously with the thermal regeneration of the old foundry sand.
  • the waste heat from the fluidized bed furnace is used to preheat the blowing air.
  • the interior of the fluidized bed furnace is divided into the lower fluidized bed 4 and the upper post-combustion chamber 3, the fluidized bed being separated from the inflow chamber for the fluidizing gas by a sieve plate or similar perforated plate in the usual way.
  • the used sand 1 obtained from the mechanical pre-cleaning, not shown, which has previously been freed from the fine-grain component or dusts accumulated there, is introduced into the fluidized bed furnace via a metering device 2 in the manner shown.
  • the used sand itself thus specifies the fluidized bed 4, the residence time of which is controlled within the furnace in such a way that the combustible binder residues still adhering to it are burned within the fluidized bed 4, optionally calcined.
  • the regenerate 5 resulting from this thermal regeneration is discharged from the furnace in order to be available for the new formation of foundry molds.
  • a layer of sand is first heated in the furnace until a predetermined target temperature of generally 500 ° C. to 900 ° C. is reached using external energy via a fuel gas, which can be metered via a valve 15 into an inflow accelerated by means of fan 14 is given.
  • a fuel gas which can be metered via a valve 15 into an inflow accelerated by means of fan 14 is given.
  • the dust obtained from the sand cycle is introduced into the fluidized bed 4 from below via a dust feed 6 and a metering feed 7 and an intermediate silo 9.
  • Air which has been preheated by means of a heat exchanger 11, serves as a means of transport for the dust through a pipeline 10.
  • the heat exchanger 11 is connected on the one hand to the outlet of the afterburning chamber 3 of the fluidized bed furnace and, on the other hand, is supplied with fresh air via a fan 8, which then leaves the heat exchanger in the desired preheated form via the pipeline 10.
  • the cooled hot air from the fluidized bed furnace is fed from the heat exchanger 11 to a separator 12, which can be, for example, a cyclone separator or a suitable filter device by means of which the inertized or calcined dusts are cleaned into the environment by a fan 13 before the exhaust air is discharged.
  • the dust with its organic combustible constituents is metered into the pipeline 10 via special lances or the like to form a combustible dust-air mixture.
  • the fuel gas can be throttled or completely switched off via the valve 15, so that the heating of the fluidized bed and the maintenance of the desired temperature in the same takes place exclusively via the dust.
  • the temperature-dependent dosage required for this can be done via a feedback circuit known per se can be controlled.
  • Inertized dust obtained in the separator 12 is discharged from the described pipe system via a cellular wheel sluice 16 or the like and collected in a container 17.
  • a pelletizing mixer can be added to this collecting vessel, for example, or it can be designed as such.
  • the dust which is fed through the fluidized bed 4 and which is fed through the line 10 is subjected to afterburning in the afterburning chamber 3, so that it is ensured in any case that it leaves the fluidized bed furnace in a completely inert form.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Processing Of Solid Wastes (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Claims (5)

  1. Procédé pour la régénération thermique de sable de fonderie déjà utilisé (1) et pour le traitement des poussières formées pendant sa circulation, consistant à utiliser un four à lit fluidisé comprenant un lit fluidisé (4) et une chambre de post-incinération (3), ainsi qu'un échangeur de chaleur (11) du côté de l'évacuation d'air, caractérisé en ce que le chauffage du lit fluidisé (4) jusqu'à la température de réaction est obtenu au moins pour une bonne part, au moyen de la poussière organique résultant de la préparation mécanique du sable déjà utilisé, en ce que les composants incombustibles de la poussière sont rendus inertes, au plus tard au cours de la post-incinération dans le four à lit fluidisé par des processus de frittage ou de calcination, et en ce que la matière régénérée (5) et la poussière rendue inerte puis fournie par l'échangeur de chaleur (11) sont extraites séparément du circuit de traitement.
  2. Procédé selon la revendication 1, caractérisé en ce que la poussière est introduite dans le lit fluidisé (4) selon des quantités dosées en fonction de la température.
  3. Procédé selon la revendication 1, caractérisé en ce que la poussière est insufflée dans le lit fluidisé (4) par l'intermédiaire d'un air porteur chauffé à l'aide de l'échangeur de chaleur (11).
  4. Procédé selon la revendication 1, caractérisé en ce que le pré-chauffage et l'inflammation, respectivement l'incinération, de la partie combustible de la poussière se produisent au sein du lit fluidisé (4), la post-incinération ayant lieu dans la chambre de post-incinération (3) qui se trouve au-dessus du lit fluidisé.
  5. Procédé selon la revendication 1, caractérisé en ce que le four à lit fluidisé bénéficie d'un apport d'énergie extérieure, par exemple par un chauffage au gaz, pour le chauffer jusqu'à la température de réaction.
EP91106468A 1990-05-10 1991-04-22 Procédé pour la régénération thermique de sable de fonderie décodé et pour le traitement des poussières formées pendant sa circulation Expired - Lifetime EP0456027B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT91106468T ATE100742T1 (de) 1990-05-10 1991-04-22 Verfahren zum thermischen regenerieren von in giessereien anfallenden altsanden, sowie zur behandlung der im sandkreislauf anfallenden staeube.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4015031 1990-05-10
DE4015031A DE4015031A1 (de) 1990-05-10 1990-05-10 Verfahren zum thermischen regenerieren von in giessereien anfallenden altsanden, sowie zur behandlung der im sandkreislauf anfallenden staeube

Publications (2)

Publication Number Publication Date
EP0456027A1 EP0456027A1 (fr) 1991-11-13
EP0456027B1 true EP0456027B1 (fr) 1994-01-26

Family

ID=6406136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91106468A Expired - Lifetime EP0456027B1 (fr) 1990-05-10 1991-04-22 Procédé pour la régénération thermique de sable de fonderie décodé et pour le traitement des poussières formées pendant sa circulation

Country Status (4)

Country Link
US (1) US5289920A (fr)
EP (1) EP0456027B1 (fr)
AT (1) ATE100742T1 (fr)
DE (2) DE4015031A1 (fr)

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DE4212097A1 (de) * 1992-04-10 1993-10-14 Boenisch Dietmar Verfahren und Vorrichtung zum Regenerieren von Giessereisand
DE4322947B4 (de) * 1992-11-27 2006-02-02 Förder- und Anlagentechnik GmbH Anordnung zur Verbesserung der Verarbeitungsgeigenschaften von Sanden
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CH688912A5 (de) * 1993-06-17 1998-05-29 Von Roll Umwelttechnik Ag Verfahren zur thermischen Behandlung von Feststoffen, die bei der Reinigung von Rauchgasen anfallen.
DK171324B1 (da) * 1994-06-29 1996-09-09 Smidth & Co As F L Anlæg til varmebehandling af stykformet materiale
US6000644A (en) * 1997-07-31 1999-12-14 General Kinematics Corporation Method and apparatus for reclaiming foundry sand
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
US6631808B2 (en) 2001-08-07 2003-10-14 Particle And Coating Technologies, Inc. Air classifier system for the separation of particles
DE10260739B3 (de) 2002-12-23 2004-09-16 Outokumpu Oy Verfahren und Anlage zur Herstellung von Metalloxid aus Metallverbindungen
DE10260734B4 (de) 2002-12-23 2005-05-04 Outokumpu Oyj Verfahren und Anlage zur Herstellung von Schwelkoks
DE10260731B4 (de) 2002-12-23 2005-04-14 Outokumpu Oyj Verfahren und Anlage zur Wärmebehandlung von eisenoxidhaltigen Feststoffen
DE10260738A1 (de) 2002-12-23 2004-07-15 Outokumpu Oyj Verfahren und Anlage zur Förderung von feinkörnigen Feststoffen
DE10260736A1 (de) * 2002-12-23 2004-09-02 Outokumpu Oyj Verfahren und Anlage zur Wärmebehandlung von feinkörnigen Feststoffen
DE10260733B4 (de) 2002-12-23 2010-08-12 Outokumpu Oyj Verfahren und Anlage zur Wärmebehandlung von eisenoxidhaltigen Feststoffen
DE10260737B4 (de) 2002-12-23 2005-06-30 Outokumpu Oyj Verfahren und Anlage zur Wärmebehandlung von titanhaltigen Feststoffen
DE10260741A1 (de) * 2002-12-23 2004-07-08 Outokumpu Oyj Verfahren und Anlage zur Wärmebehandlung von feinkörnigen Feststoffen
US7275644B2 (en) * 2004-10-12 2007-10-02 Great River Energy Apparatus and method of separating and concentrating organic and/or non-organic material
US8523963B2 (en) * 2004-10-12 2013-09-03 Great River Energy Apparatus for heat treatment of particulate materials
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US8579999B2 (en) * 2004-10-12 2013-11-12 Great River Energy Method of enhancing the quality of high-moisture materials using system heat sources
US9138803B2 (en) * 2011-06-23 2015-09-22 S&B Industrial Minerals North America, Inc. Method for improvement of casting quality
DE102013001801B4 (de) 2013-02-01 2014-12-18 Bernd Federhen Verfahren und Vorrichtung zur mechanischen Behandlung von Gießereisanden
CN104096794A (zh) * 2013-04-08 2014-10-15 于彦奇 粘土砂热法再生机
CN104759582A (zh) * 2015-03-18 2015-07-08 兰贤光 一种旧树脂再生破碎设备
DE102015104340A1 (de) 2015-03-23 2016-09-29 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Formsandkühler
CN105170901B (zh) * 2015-10-26 2017-05-17 中车长江车辆有限公司 大型铸钢件湿型粘土砂处理系统及砂处理方法
CN105458174A (zh) * 2016-01-21 2016-04-06 浙江卡博铜业有限公司 砂模铸造生产流水线
MX2019010001A (es) 2017-02-24 2019-12-16 Kb Foundry Services Llc Metodo y sistema para limpieza de arena.
DE102019130747A1 (de) * 2019-11-14 2021-05-20 WEBAC - Gesellschaft für Maschinenbau mbH Anlage und verfahren zum regenerieren von altsand, vorrichtung zum betreiben einer derartigen anlage sowie verwendung von abluft
JP7567496B2 (ja) * 2021-01-21 2024-10-16 トヨタ自動車株式会社 流動加熱炉及び加熱方法
CN117564215B (zh) * 2024-01-15 2024-04-05 济南二机床集团有限公司 一种型砂电加热装置及加热控制方法

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Also Published As

Publication number Publication date
ATE100742T1 (de) 1994-02-15
DE4015031A1 (de) 1991-11-14
DE4015031C2 (fr) 1993-06-17
US5289920A (en) 1994-03-01
DE59100931D1 (de) 1994-03-10
EP0456027A1 (fr) 1991-11-13

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