DE4306007A1 - Method for regenerating water-glass-bonded used foundry sands - Google Patents

Method for regenerating water-glass-bonded used foundry sands

Info

Publication number
DE4306007A1
DE4306007A1 DE4306007A DE4306007A DE4306007A1 DE 4306007 A1 DE4306007 A1 DE 4306007A1 DE 4306007 A DE4306007 A DE 4306007A DE 4306007 A DE4306007 A DE 4306007A DE 4306007 A1 DE4306007 A1 DE 4306007A1
Authority
DE
Germany
Prior art keywords
sand
foundry
glass
moulding
foundry sand
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.)
Ceased
Application number
DE4306007A
Other languages
German (de)
Inventor
Hermann Hiery
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.)
DIETMAR DOMNICK FA
Original Assignee
DIETMAR DOMNICK FA
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
Application filed by DIETMAR DOMNICK FA filed Critical DIETMAR DOMNICK FA
Priority to DE4306007A priority Critical patent/DE4306007A1/en
Publication of DE4306007A1 publication Critical patent/DE4306007A1/en
Ceased legal-status Critical Current

Links

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
    • B22C5/02—Dressing by centrifuging essentially or additionally

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

In the foundry, waterglass is employed as moulding-material binder which, after the moulding, is cured by gassing with acidic gases. Foundry sands of this type can generally be used only once and must be disposed of after the casting process. The new method is to enable the foundry sand to be treated in such a way that it can be reused without restriction. The water-glass-bonded foundry sand is heated after destruction of the sand lumps in a furnace (4) to a temperature exceeding 200 DEG C, as a result of which the troublesome constituents are destroyed or converted, so that there is no disadvantageous influence on a further moulding process. Subsequently, the sand is cooled to processing temperature in a cooler (5). <IMAGE>

Description

In der Gießerei ist Wasserglas seit langem als Formstoffbindemittel in Verwendung. Bei diesem Verfahren wird der Gießereisand mit geeignetem Wasserglas und eigenschaftsverbessernden Zusätzen vermischt und nach dem Formen mit sauren Gasen (meist Kohlendioxid) zur Aushärtung gebracht. Durch die dabei entstehende Kieselsäure werden die Sandkörner vernetzt und bilden eine stabile Form.In the foundry, water glass has long been used as a binder for molding materials. In this process, the foundry sand is coated with a suitable water glass and property-improving additives mixed and after molding with acid gases (mostly carbon dioxide) hardened. Due to the resulting silica the sand grains are cross-linked and form a stable shape.

Derartige Gießereisande können im allgemeinen nur einmal verwendet werden und müssen daher nach jedem Gießprozeß entsorgt werden.Such foundry sands can generally only be used once and must therefore be disposed of after each casting process.

Eine Wiederverwertung derartiger Gießereisande setzt voraus, daß der Gießereisand entweder von Bindemittelrückständen befreit wird, oder die Bindemittelrückstände derart umgewandelt werden, daß sie einen weiteren Formprozeß nicht negativ beeinflussen.The recycling of such foundry sand requires that the foundry sand either from binder residues, or the binder residues in such a way be converted so that they do not negatively influence a further molding process.

Bekannte Verfahren lösen diese Aufgabe, indem sie den Gießereisand einem intensiven Prall- oder Scheuerprozeß unterziehen, wodurch die Bindemittelrückstände teilweise entfernt werden. Derartige Regenerate sind nur bedingt wiederverwendbar. Ein weiterer Nachteil derartiger Verfahren ist der beträchtliche Staubanfall.Known processes solve this task by intensifying the foundry sand Undergo impact or scrubbing process, which partially removes binder residues become. Such regenerates are only partially reusable. Another The disadvantage of such processes is the considerable accumulation of dust.

Andere Verfahren regenerieren den Gießereisand indem die Bindemittelrückstände durch Waschen entfernt werden. Derartige Verfahren liefern gutes Regenerat, allerdings sind sie sehr aufwendig und teuer. Ein weiteres Problem derartiger Verfahren ist die hohe Abwasserbelastung.Other processes regenerate the foundry sand by removing the binder residues Washing can be removed. Such processes provide good regrind, but they are very complex and expensive. Another problem with such methods is the high one Waste water pollution.

Die Erfindung bezweckt, ein wirtschaftliches Verfahren zu schaffen, bei dem das Ausgangsprodukt wasserglasgebundener Gießereisand so behandelt wird, daß er sich ohne Einschränkungen wie Neusand verwenden läßt.The invention aims to provide an economical method in which the Starting product water-glass-bound foundry sand is treated so that it can be used like new sand without restrictions.

Gelöst wird diese Aufgabe, indem der Gießereialtsand nach einer Zerstörung der Sandknollen derart erhitzt wird, daß die Bindemittelrückstände entweder zerstört oder derart umgewandelt werden, daß sie einen weiteren Formprozeß nicht negativ beeinflussen.This task is solved by the foundry sand after the destruction of the Sand tubers are heated so that the binder residues are either destroyed or be transformed in such a way that they do not negatively affect another molding process influence.

Fig. 1 zeigt ein Schema eines derartigen Verfahrens. Fig. 1 is a diagram showing such a method.

Die nach dem Gießen anfallenden Sandknollen werden in einem Brecher 1 mechanisch zerstört und in einem Behälter 2 zwischengelagert. Von hier wird der Gießereisand mittels einer Fördereinrichtung 3 kontinuierlich oder chargenweise einem Ofen 4 zugeführt, wo der Gießereisand auf eine 200°C übersteigende Temperatur erhitzt wird, wodurch die Bindemittelrückstände entweder zerstört oder derart umgewandelt werden, daß sie einen weiteren Formprozeß nicht negativ beeinflussen. Im anschließenden Kühler 5 wird der Gießereisand wieder abgekühlt, so daß er sich anstelle von Neusand verwenden läßt.
The tuber of sand obtained after casting is mechanically destroyed in a crusher 1 and temporarily stored in a container 2 . From here, the foundry sand is fed continuously or in batches to a furnace 4 by means of a conveyor 3 , where the foundry sand is heated to a temperature exceeding 200 ° C., whereby the binder residues are either destroyed or converted in such a way that they do not adversely affect a further molding process. In the subsequent cooler 5 , the foundry sand is cooled again so that it can be used instead of new sand.

Claims (2)

1. Verfahren zur Regenerierung wasserglasgebundener Gießereisande, dadurch gekennzeichnet, daß der mechanisch zerkleinerte Gießereisand kontinuierlich oder chargenweise einem Ofen (4) zugeführt, und auf eine 200°C übersteigende Temperatur erhitzt wird, wodurch die störenden Bestandteile zerstört, oder derart umgewandelt werden, daß der Gießereisand für einen weiteren Formprozeß geeignet ist.1. A process for the regeneration of water-glass-bound foundry sands, characterized in that the mechanically comminuted foundry sand is fed continuously or in batches to an oven ( 4 ), and is heated to a temperature exceeding 200 ° C, whereby the disruptive constituents are destroyed, or are converted such that the Foundry sand is suitable for another molding process. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der heiße Sand in einem Kühler (5) auf Verarbeitungstemperatur abgekühlt wird.2. The method according to claim 1, characterized in that the hot sand is cooled in a cooler ( 5 ) to the processing temperature.
DE4306007A 1993-02-26 1993-02-26 Method for regenerating water-glass-bonded used foundry sands Ceased DE4306007A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE4306007A DE4306007A1 (en) 1993-02-26 1993-02-26 Method for regenerating water-glass-bonded used foundry sands

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4306007A DE4306007A1 (en) 1993-02-26 1993-02-26 Method for regenerating water-glass-bonded used foundry sands

Publications (1)

Publication Number Publication Date
DE4306007A1 true DE4306007A1 (en) 1994-09-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE4306007A Ceased DE4306007A1 (en) 1993-02-26 1993-02-26 Method for regenerating water-glass-bonded used foundry sands

Country Status (1)

Country Link
DE (1) DE4306007A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10038419A1 (en) * 2000-08-07 2002-02-21 Volkswagen Ag Method for regenerating foundry sand bound to waterglass comprises mechanical pretreatment of the foundry sand, the addition of water, movement of the pulp by external forces
DE102007008149A1 (en) * 2007-02-19 2008-08-21 Ashland-Südchemie-Kernfest GmbH Thermal regeneration of foundry sand
US20100326620A1 (en) * 2007-10-30 2010-12-30 Ashland-Südchemie-Kernfest GmbH Mould material mixture having improved flowability
WO2013026579A1 (en) * 2011-08-25 2013-02-28 Bayerische Motoren Werke Aktiengesellschaft Method for regenerating the sand of sand molds and sand cores
DE102015004889A1 (en) 2015-04-16 2016-10-20 Technische Universität Bergakademie Freiberg Process for coring castings with subsequent regeneration of the core salt
EP3202927A1 (en) 2016-02-08 2017-08-09 Klein Anlagenbau AG Method of and device for regeneration of foundry sand

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1210561A (en) * 1983-03-16 1986-09-02 Dieter S. Leidel Method of regenerating old casting sand and apparatus for carrying out the method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1210561A (en) * 1983-03-16 1986-09-02 Dieter S. Leidel Method of regenerating old casting sand and apparatus for carrying out the method
US4681267A (en) * 1983-03-16 1987-07-21 Leidel Dieter S Method of regenerating old casting sand

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
AFS Transactions 69 (1985), S. 429-424 *
DE-Z: Giesserei 74, 1987, Nr. 10, S. 318-321 *
DE-Z: Giesserei 76, 1989, Nr. 21, S. 737-742 *
DE-Z: Giesserei 78, 1991, Nr. 22, S. 822-825 *

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10038419A1 (en) * 2000-08-07 2002-02-21 Volkswagen Ag Method for regenerating foundry sand bound to waterglass comprises mechanical pretreatment of the foundry sand, the addition of water, movement of the pulp by external forces
AU2008217190C1 (en) * 2007-02-19 2013-11-28 Ashland-Sudchemie-Kernfest Gmbh Thermal regeneration of foundry sand
DE102007008149A1 (en) * 2007-02-19 2008-08-21 Ashland-Südchemie-Kernfest GmbH Thermal regeneration of foundry sand
WO2008101668A1 (en) * 2007-02-19 2008-08-28 Ashland-Südchemie-Kernfest GmbH Thermal regeneration of foundry sand
US9737927B2 (en) 2007-02-19 2017-08-22 Ask Chemicals Gmbh Thermal regeneration of foundry sand
DE202008018001U1 (en) 2007-02-19 2011-04-14 Ashland-Südchemie-Kernfest GmbH Thermally regenerated foundry sand, molding material mixture containing regenerated foundry sand and fluidized bed reactor or rotary kiln for regenerating foundry sand
EP2329900A2 (en) 2007-02-19 2011-06-08 Ashland-Südchemie-Kernfest GmbH Thermal recorery of casting sand
EP2329900A3 (en) * 2007-02-19 2012-12-12 ASK Chemicals GmbH Thermal recorery of casting sand
AU2008217190B2 (en) * 2007-02-19 2013-06-13 Ashland-Sudchemie-Kernfest Gmbh Thermal regeneration of foundry sand
EP2209572B1 (en) 2007-10-30 2016-12-14 ASK Chemicals GmbH Mould material mixture having improved flowability
US20160059301A1 (en) * 2007-10-30 2016-03-03 Ask Chemicals Gmbh Mould material mixture having improved flowability
US20100326620A1 (en) * 2007-10-30 2010-12-30 Ashland-Südchemie-Kernfest GmbH Mould material mixture having improved flowability
US10232430B2 (en) * 2007-10-30 2019-03-19 Ask Chemicals Gmbh Mould material mixture having improved flowability
CN103561885A (en) * 2011-08-25 2014-02-05 宝马股份公司 Method for regenerating the sand of sand molds and sand cores
US8985184B2 (en) 2011-08-25 2015-03-24 Bayerische Motoren Werke Aktiengesellschaft Method for regenerating the sand of sand molds and sand cores
CN103561885B (en) * 2011-08-25 2016-11-16 宝马股份公司 For by the sand regeneration method of sand mo(u)ld and core
WO2013026579A1 (en) * 2011-08-25 2013-02-28 Bayerische Motoren Werke Aktiengesellschaft Method for regenerating the sand of sand molds and sand cores
DE102015004889A1 (en) 2015-04-16 2016-10-20 Technische Universität Bergakademie Freiberg Process for coring castings with subsequent regeneration of the core salt
EP3202927A1 (en) 2016-02-08 2017-08-09 Klein Anlagenbau AG Method of and device for regeneration of foundry sand
US11235376B2 (en) 2016-02-08 2022-02-01 Klein Anlagenbau Ag Method and device for regenerating foundry sand

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