EP0521201B1 - Procédé pour la régéneration de sable de fonderie decoché - Google Patents

Procédé pour la régéneration de sable de fonderie decoché Download PDF

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Publication number
EP0521201B1
EP0521201B1 EP19910250173 EP91250173A EP0521201B1 EP 0521201 B1 EP0521201 B1 EP 0521201B1 EP 19910250173 EP19910250173 EP 19910250173 EP 91250173 A EP91250173 A EP 91250173A EP 0521201 B1 EP0521201 B1 EP 0521201B1
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EP
European Patent Office
Prior art keywords
sand
water
used sand
fluidised bed
shells
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
EP19910250173
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German (de)
English (en)
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EP0521201A1 (fr
Inventor
Hans-Klaus Dr.-Ing. Schott
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.)
Kuettner GmbH and Co KG
Original Assignee
Kuettner GmbH and Co KG
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Filing date
Publication date
Application filed by Kuettner GmbH and Co KG filed Critical Kuettner GmbH and Co KG
Priority to ES91250173T priority Critical patent/ES2100205T3/es
Priority to EP19910250173 priority patent/EP0521201B1/fr
Priority to DE59108648T priority patent/DE59108648D1/de
Publication of EP0521201A1 publication Critical patent/EP0521201A1/fr
Application granted granted Critical
Publication of EP0521201B1 publication Critical patent/EP0521201B1/fr
Anticipated expiration legal-status Critical
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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
    • B22C5/185—Plants for preparing mould materials comprising a wet reclamation step
    • 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

Definitions

  • the binding agent is fixed in a shell-like manner on the surface of the quartz grains by fireclaying (oolithization), while it is in the case of molding sands with organic Binding agents in the course of the casting process lead to their thermal decomposition and thus to adherent residues of carbon-rich degradation products of the organic binders on the surface of the quartz grains.
  • further additives lead to contamination of the old sand, such as the formation of shiny carbon.
  • used sand which at least consists predominantly of used organic sand
  • the binder casings and other impurities of the old sand are usually so far removed that the used sand can be reused as molding sand.
  • this thermal treatment process does not lead to a satisfactory result for inorganic waste sands.
  • DE-PS 38 15 877 to subject the (for example according to DE-PS 31 03 030) thermally-mechanically (pre-) treated regenerate to an ultrasonic treatment in water (as a coupling layer). This is intended to cause the binder shells sintered onto the quartz grains to flake off and to reduce the degree of oolithization to normal values.
  • hydrocarbon compounds contain organic waste sand as well as clanz carbon and its formers cannot be removed sufficiently. These substances (like clayey components, for example) act as lubricants and hinder the desired abrasion, so that even with multi-stage attrition, a sufficiently satisfactory regeneration result cannot be achieved.
  • the present invention has for its object, while avoiding the aforementioned and other disadvantages to provide a both technically and economically satisfactory method for processing used foundry sand, in which (compared to the prior art) relatively low technical and economic outlay a largely generally usable regrind with relatively low pollutant components What can be achieved, which enables problem-free reuse instead of new sand for mold and core production in foundries.
  • the solution to this problem is, according to the invention, that the old sand to be treated is first soaked with water so that the pores of the grain shells i.w. are filled with water, and that the impregnated old sand is then placed in a heated fluidized bed, the water in the pores spontaneously evaporating due to the shock heating of the old sand to be treated and the grain shells being blown off or at least blown off due to the considerable increase in volume of the water that arises are loosened so much that they can be separated from the quartz grains directly in the fluidized bed. Due to the usual drying of wet regenerated used sand using hot air at approx. 150 - 300 ° C, such a blasting or loosening effect is not achieved, as the binding agent requirement mentioned above shows.
  • the heat dissipation by the water evaporation in the immediate vicinity of the quartz grain prevents a possible change in the crystal modification and a grain decay due to a shock-like heating of the quartz grains.
  • the used sand which can consist of any mixture of organically and inorganically bound used sands, has to pass through an attraction stage that is otherwise necessary for wet regeneration when it is wetted or soaked. This results in considerable economic advantages due to the simplified method of operation and the less expensive equipment.
  • the process according to the invention is highly satisfactory not only from a technical but also from an economic point of view, especially since the heated fluidized bed can itself consist of sand (possibly also of already processed used sand).
  • the ratio of the amount of fluidized bed sand to the amount of moist used sand supplied per minute can be selected in the range from approximately 50 to 100.
  • the fluidized bed is most preferably heated from above, preferably with high-speed burners, gaseous fuels having proven to be particularly useful as the additional fuel (in addition to the fuel components already contained in the used sand).
  • the fluidized bed can preferably be kept at a steady temperature of approximately 750 to 950 ° C.
  • the dwell time of the used sand to be processed in the fluidized bed can be adjusted depending on its nature. In this way, a complete burnout of organic substances is to be ensured.
  • the old sand to be humidified and to be treated is moistened in a vacuum.
  • the drawing shows a schematic representation of a bunker 1 in which the used sand, which is regularly a mixture of inorganic and organic used sand, is collected.
  • the used sand to be processed is fed from the bunker 1 to a used sand preparation 2 (consisting of a magnetic separator for separating Fe parts, a tuber shredder and a sieve) and from there it arrives in an intermediate bunker 3.
  • a used sand preparation 2 consisting of a magnetic separator for separating Fe parts, a tuber shredder and a sieve
  • the prepared used sand is fed by means of a metering device 4 to a mixer 5, into which water 6 and agents which reduce the surface tension are also added.
  • the water is heated to max. 95 ° C heated.
  • the moist sand is circulated in a conditioner 7 until the pores of the grain shells are completely moistened is reached and then metered into a fluidized bed furnace 8.
  • the wet old sand to be treated is suddenly heated to an operating temperature of 800 to 850 °, whereby the steam formation described above blows the fireclay shells off the quartz grains or at least considerably loosens them and organic Burn pollutants completely.
  • the furnace exhaust gas is cooled in a heat exchanger 11 while preheating the fluidized air.
  • the furnace discharge To cool the furnace discharge, it first passes through a fluidized bed cooler 12, in which the water required for the impregnation is preheated to 70 to 95 ° C. and the sensible heat of the sand is recovered in the form of steam or hot water.
  • a final treatment of the regenerate obtained takes place in a pneumatic cleaning device 13 and a fractionation into (at least) two grits ("coarse” and "fine”).
  • the processed used sand is universally reusable, whereby the granulation of the new sand to be formed from the processed used sand (if necessary with a certain addition of new sand) can be done by dosing from the individual fractions in order to obtain used sand with a predetermined average grain size or a certain grain size range .
  • the filter dust is free of pollutants and can be safely deposited or used, for example, as a building material or aggregate.

Landscapes

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

Claims (10)

  1. Procédé de régénération de vieux sable de fonderie dont les grains de quartz comportent une enveloppe de grain constituée principalement de liants minéraux et/ou organiques du sable de fonderie d'origine, selon lequel on écarte des grains de quartz, par choc thermique, les enveloppes de grains du vieux sable se trouvant alors dans une couche turbulente, caractérisé en ce que l'on imprègne d'abord le vieux sable à traiter avec de l'eau, de telle sorte que les pores des enveloppes de grains sont globalement remplis d'eau, et en ce que l'on fait ensuite passer le vieux sable imprégné dans une couche turbulente chauffée, le choc thermique auquel est alors soumis le vieux sable faisant spontanément évaporer l'eau qui se trouve dans les pores des enveloppes de grains et faisant que les enveloppes de grains se séparent des grains de quartz par éclatement dû à l'augmentation ainsi provoquée du volume de l'eau, ou qu'elles s'en détachent suffisamment pour tomber des grains de quartz alors qu'elles sont encore dans la couche turbulente.
  2. Procédé selon la revendication 1, caractérisé en ce que la couche turbulente chauffée est formée de sable.
  3. Procédé selon la revendication 2, caractérisé en ce que le rapport de la quantité de sable de la couche turbulente et de la quantité de vieux sable humide amené par minute vaut environ 50 à 100.
  4. Procédé selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que, dans le cas de l'arrivée séparée de vieux sables ayant des enveloppes de grains formées de liants minéraux ou de vieux sables ayant des enveloppes de grains formées de liants organiques, on amène séparément ces sables dans la couche turbulente, seul le vieux sable ayant des enveloppes de grains constituées de liants minéraux ayant préalablement été imprégnés d'eau.
  5. Procédé selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que l'on préchauffe à une température de 70 à 95 °C l'eau destinée à imprégner le vieux sable.
  6. Procédé selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que l'on ajoute à l'eau des produits diminuant la tension superficielle.
  7. Procédé selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que l'on chauffe la couche turbulente par le haut.
  8. Procédé selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que l'on maintient la couche turbulente à une température d'équilibre thermique de 750 à 950 °C environ.
  9. Procédé selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que l'on peut régler la durée de séjour du vieux sable à traiter dans la couche turbulente.
  10. Procédé selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que l'on imprègne sous vide le vieux sable à traiter avec de l'eau.
EP19910250173 1991-06-29 1991-06-29 Procédé pour la régéneration de sable de fonderie decoché Expired - Lifetime EP0521201B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES91250173T ES2100205T3 (es) 1991-06-29 1991-06-29 Procedimiento para regenerar arena usada de fundicion.
EP19910250173 EP0521201B1 (fr) 1991-06-29 1991-06-29 Procédé pour la régéneration de sable de fonderie decoché
DE59108648T DE59108648D1 (de) 1991-06-29 1991-06-29 Verfahren zum Regenerieren von Giesserei-Altsand

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19910250173 EP0521201B1 (fr) 1991-06-29 1991-06-29 Procédé pour la régéneration de sable de fonderie decoché

Publications (2)

Publication Number Publication Date
EP0521201A1 EP0521201A1 (fr) 1993-01-07
EP0521201B1 true EP0521201B1 (fr) 1997-04-02

Family

ID=8208136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910250173 Expired - Lifetime EP0521201B1 (fr) 1991-06-29 1991-06-29 Procédé pour la régéneration de sable de fonderie decoché

Country Status (3)

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EP (1) EP0521201B1 (fr)
DE (1) DE59108648D1 (fr)
ES (1) ES2100205T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007008104A1 (de) 2007-02-19 2008-08-21 Daimler Ag Verfahren zur Regeneration von Gießereisanden
CN109482809A (zh) * 2018-12-25 2019-03-19 大连汇隆活塞股份有限公司 一种废旧水玻璃铬矿砂的处理方法
DE102020004563A1 (de) 2020-07-28 2022-02-03 Joachim Ernstberger Verfahren zum Temperieren und gleichzeitigem Entstauben von Kernsanden

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1050209A (fr) * 1974-12-16 1979-03-13 Julius M. Bleuenstein Recuperation et nettoyage du sable
CH640159A5 (de) * 1979-06-06 1983-12-30 Foundry Design Corp Europ Verfahren und anlage zum formen, nassentsanden und reinigen von gussstuecken.
DE3639634A1 (de) * 1986-11-24 1988-07-21 Klein Alb Gmbh Co Kg Verfahren und vorrichtung zum regenerieren von giessereisand
DE3825361A1 (de) * 1988-07-26 1990-02-08 Hermann Jacob Verfahren und anlage zur regenerierung von giessereialtsandgemischen

Also Published As

Publication number Publication date
ES2100205T3 (es) 1997-06-16
DE59108648D1 (de) 1997-05-07
EP0521201A1 (fr) 1993-01-07

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