EP0456027B1 - Process for thermal regeneration of returned foundry sand and for treating dust formed during its circulation - Google Patents

Process for thermal regeneration of returned foundry sand and for treating dust formed during its 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
fluidized bed
dust
fluidized
sand
characterised
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)
French (fr)
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EP0456027A1 (en
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
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Kgt Giessereitechnik GmbH
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Priority to DE4015031A priority Critical patent/DE4015031C2/de
Priority to DE4015031 priority
Application filed by Kgt Giessereitechnik GmbH filed Critical Kgt Giessereitechnik GmbH
Publication of EP0456027A1 publication Critical patent/EP0456027A1/en
Application granted granted Critical
Publication of EP0456027B1 publication Critical patent/EP0456027B1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6406136&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0456027(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C5/00Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/08Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S241/00Solid material comminution or disintegration
    • Y10S241/10Foundry sand treatment

Description

  • The invention relates to a method for the thermal regeneration of used sand accumulating in foundries according to the preamble of claim 1.
  • Such methods are generally known. 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.
  • In a known method for transferring the heat accumulating in the fluidized bed of a fluidized bed furnace to a heat-consuming process (DE-A-3232481), the exothermic and endothermic processes within the fluidized bed furnace take place separately from one another. For this purpose, 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. Equally, 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.
  • Regardless of this, it is also part of the prior art to burn carbon-containing materials in furnaces with a stationary fluidized bed. When operating the furnace, solid material is used withdrawn from the fluidized bed combustion chamber, namely the total bed material consisting of the ash and the inert material used, such as quartz sand. This material contains fine particles that can be added to the fluidized bed again. (DE-C-3107355).
  • From GB-A-20 77 614 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.
  • Starting from this prior art, 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.
  • This object is achieved according to the invention by the features specified in the characterizing part of claim 1.
  • Advantageous further developments and refinements of this procedure result from the subclaims.
  • The fact that the mechanical pre-cleaning of the old sand Any dust that accumulates with a considerable proportion of organic combustible components is separated off before the sand is thermally processed. A dusty material with an exothermic energy balance is obtained. The used sand is thermally processed in a fluidized bed furnace after the dust components are separated off, the used sand itself forming the fluidized bed. The endothermic treatment of the used sand takes place advantageously using the exothermic process of the combustion of the organic dust component within the fluidized bed. The non-combustible components of the dust are rendered inert at the latest in the afterburning zone of the fluidized bed furnace above the fluidized bed. 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. This means that the combustible constituents of the dusts are used directly to substitute the primary energy for heating the fluidized bed furnace. 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 accompanying drawing shows an example of an embodiment of a device for carrying out the method by means of which the invention is to be explained in more detail below.
  • As can be seen from the illustration, 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.
  • During the start-up phase of the fluidized bed furnace 3, 4, 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. After the target temperature has been reached within the fluidized bed 4, 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.
  • From the intermediate silo 9, 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. Depending on the current calorific value of the dust, 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.

Claims (5)

  1. Process for thermal regeneration of returned foundry sand (1) as well as treatment of dust formed during circulation of the sand using a fluidized-bed furnace with a fluidized bed (4) and a post-combustion chamber (3) as well as an exhaust-air heat exchanger (11), characterised in that heating of the fluidized bed (4), which has been raised to reaction temperature, is carried out at least to a substantial extent with the organic dust fraction obtained during the mechanical preparation of the waste sand, that non-combustible components of the dust fraction are at the latest in post-combustion of the fluidized-bed furnace purged by sintering and/or calcination processes, and that the regenerated material (5) and the purged dust given via the heat exchanger (11) are separately retrieved from the process.
  2. Process according to claim 1, characterised in that the dust is entered into the fluidized bed (4) at a temperature-dependent dosage.
  3. Process according to claim 1, characterised in that the dust is blown into the fluidized bed (4) by means of air which is preheated in the heat exchanger (11).
  4. Process according to claim 1, characterised in that preheating and ignition or combustion of the combustible dust portion is carried out in the fluidized bed (4), and post-combustion in the post-combustion chamber (3) located above the fluidized bed.
  5. Process according to claim 1, characterised in that starting up of the fluidized-bed furnace up to heating of the fluidized bed (4) to reaction temperature is carried out by means of a separate energy, for example fuel gas.
EP91106468A 1990-05-10 1991-04-22 Process for thermal regeneration of returned foundry sand and for treating dust formed during its circulation Expired - Lifetime EP0456027B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE4015031A DE4015031C2 (en) 1990-05-10 1990-05-10
DE4015031 1990-05-10

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT91106468T AT100742T (en) 1990-05-10 1991-04-22 Method for the thermal regeneration of old sands containing in foundry, and for treating the dust resulting in the sand circuit.

Publications (2)

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

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ID=6406136

Family Applications (1)

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EP91106468A Expired - Lifetime EP0456027B1 (en) 1990-05-10 1991-04-22 Process for thermal regeneration of returned foundry sand and for treating dust formed during its circulation

Country Status (4)

Country Link
US (1) US5289920A (en)
EP (1) EP0456027B1 (en)
AT (1) AT100742T (en)
DE (1) DE4015031C2 (en)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
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US5251684A (en) * 1991-12-06 1993-10-12 Gmd Engineered Systems, Inc. Method for controlling the oxidation and calcination of waste foundry sands
DE4212097C2 (en) * 1992-04-10 1994-01-27 Boenisch, Dietmar, Prof. Dr.-Ing., 52064 Aachen, De
DE4322947B4 (en) * 1992-11-27 2006-02-02 Förder- und Anlagentechnik GmbH Arrangement for improving the processing properties of sands
FR2700972B1 (en) * 1993-01-29 1995-04-21 Neu Sechage Ind Device for heat treatment of refractory particles.
CH688912A5 (en) * 1993-06-17 1998-05-29 Von Roll Umwelttechnik Ag A process for the thermal treatment of solids which arise in the purification of flue gases.
DK171324B1 (en) * 1994-06-29 1996-09-09 Smidth & Co As F L Installations for heat treatment of unitary material
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
DE10260737B4 (en) 2002-12-23 2005-06-30 Outokumpu Oyj Process and plant for the heat treatment of titanium-containing solids
DE10260736A1 (en) * 2002-12-23 2004-09-02 Outokumpu Oyj Process and plant for the heat treatment of fine-grained solids
DE10260738A1 (en) 2002-12-23 2004-07-15 Outokumpu Oyj Process and plant for conveying fine-grained solids
DE10260731B4 (en) 2002-12-23 2005-04-14 Outokumpu Oyj Process and plant for the heat treatment of iron oxide-containing solids
DE10260739B3 (en) 2002-12-23 2004-09-16 Outokumpu Oy Process and plant for producing metal oxide from metal compounds
DE10260741A1 (en) * 2002-12-23 2004-07-08 Outokumpu Oyj Process and plant for the heat treatment of fine-grained solids
DE10260733B4 (en) 2002-12-23 2010-08-12 Outokumpu Oyj Process and plant for the heat treatment of iron oxide-containing solids
DE10260734B4 (en) 2002-12-23 2005-05-04 Outokumpu Oyj Process and plant for the production of carbon coke
US8579999B2 (en) * 2004-10-12 2013-11-12 Great River Energy Method of enhancing the quality of high-moisture materials using system heat sources
US7987613B2 (en) * 2004-10-12 2011-08-02 Great River Energy Control system for particulate material drying apparatus and process
US8523963B2 (en) * 2004-10-12 2013-09-03 Great River Energy Apparatus for heat treatment of particulate materials
US7275644B2 (en) * 2004-10-12 2007-10-02 Great River Energy Apparatus and method of separating and concentrating organic and/or non-organic material
US9138803B2 (en) * 2011-06-23 2015-09-22 S&B Industrial Minerals North America, Inc. Method for improvement of casting quality
DE102013001801B4 (en) 2013-02-01 2014-12-18 Bernd Federhen Method and device for the mechanical treatment of foundry sand
CN104096794A (en) * 2013-04-08 2014-10-15 于彦奇 Hot reclaimation device for clay sand
CN104759582A (en) * 2015-03-18 2015-07-08 兰贤光 Used resin regeneration crushing device
DE102015104340A1 (en) * 2015-03-23 2016-09-29 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Molding sand coolers
CN105170901B (en) * 2015-10-26 2017-05-17 中车长江车辆有限公司 Large-size cast steel wet type clay sand treatment system and sand treatment method
CN105458174A (en) * 2016-01-21 2016-04-06 浙江卡博铜业有限公司 Sand casting production line
WO2018157060A2 (en) 2017-02-24 2018-08-30 KB Foundry Services, LLC Method and system for cleaning sand

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Also Published As

Publication number Publication date
US5289920A (en) 1994-03-01
DE4015031A1 (en) 1991-11-14
EP0456027A1 (en) 1991-11-13
DE4015031C2 (en) 1993-06-17
AT100742T (en) 1994-02-15

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