EP0257446A2 - Procédé et dispositif de régénération par voie humide de sable de fonderie usé - Google Patents

Procédé et dispositif de régénération par voie humide de sable de fonderie usé Download PDF

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Publication number
EP0257446A2
EP0257446A2 EP87111654A EP87111654A EP0257446A2 EP 0257446 A2 EP0257446 A2 EP 0257446A2 EP 87111654 A EP87111654 A EP 87111654A EP 87111654 A EP87111654 A EP 87111654A EP 0257446 A2 EP0257446 A2 EP 0257446A2
Authority
EP
European Patent Office
Prior art keywords
sand
water
mixture
attraction
regenerated
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.)
Withdrawn
Application number
EP87111654A
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German (de)
English (en)
Other versions
EP0257446A3 (fr
Inventor
Heinz Sagmeister
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.)
Badische Maschinenfabrik GmbH
BMD Badische Maschinenfabrik Durlach GmbH
Original Assignee
Badische Maschinenfabrik GmbH
BMD Badische Maschinenfabrik Durlach 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
Application filed by Badische Maschinenfabrik GmbH, BMD Badische Maschinenfabrik Durlach GmbH filed Critical Badische Maschinenfabrik GmbH
Publication of EP0257446A2 publication Critical patent/EP0257446A2/fr
Publication of EP0257446A3 publication Critical patent/EP0257446A3/fr
Withdrawn legal-status Critical Current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
    • B22C5/18—Plants for preparing mould materials
    • B22C5/185—Plants for preparing mould materials comprising a wet reclamation step

Definitions

  • the invention relates to a method for wet regeneration of foundry sands, in particular clay-bound sands, by pre-desludging the water-mixed old sand, the pre-desludged mixture is fed to a friction washing system in which the binders and contaminants adhering to the old sand grain are separated off by attraction, then the mixture is desludged and the regenerated sand obtained is dewatered and dried. Furthermore, the invention is directed to an apparatus for performing the method.
  • the third known method is wet regeneration, in which the old sand mixed with water is set in motion, the cleaning effect being achieved exclusively by the abrasive frictional forces between the moving sand particles.
  • the sand / water mixture is agitated by a stirrer (e.g. US Pat. No. 2,783,511).
  • a stirrer e.g. US Pat. No. 2,783,511.
  • part of the regenerated and desludged sand is returned to the stirrer, in order to take advantage of the greater abrasive effect of the processed sand compared to the used sand. Due to the high proportion of returned sand (up to 85%), the performance of such regeneration is relatively poor.
  • the invention has for its object to provide a method for wet regeneration of old sand, in which a greater yield of regenerated sand, with a quality equivalent to that of new sand, is obtained and the costs of the water balance can be reduced.
  • this object is achieved in that the used sand / water mixture is treated in several, spatially separate, one after the other, the switched attraction stages, the mixture of each attraction stage is removed and desludged and the desludged mixture is fed to the next attraction stage.
  • the regrind sand which is obtained after desludging after the last attraction stage is washed, then dewatered and dried. With the final washing process, a regenerated sand with a particularly high degree of regeneration is obtained.
  • the sludge obtained at each desludging step and the sludge that may arise when washing the regenerated sand is clarified and the clarified water is returned to the old sand in the cycle.
  • part of the clarified water can optionally be used to wash the regenerated sand.
  • the fresh water to be supplied to the water circuit to compensate for the lost water is preferably used for washing the regenerated sand.
  • the majority of the water is circulated. Essentially, only the water losses occurring during desludging and the evaporation losses when drying the regenerated sand need to be supplemented by fresh water.
  • the sludge that accumulates during classification, washing and clarification can - like the old sand - be deposited in landfills.
  • this sludge often contains organic compounds that result from the various binders and additives of the molding and core sand, it may be advisable to subject the sludge to a thermal cleaning process in order to separate or burn the organic constituents.
  • the dust-like residue then obtained can be landfilled without further notice.
  • the invention is based on a known device (DE- Magazine "Giesserei” 1972, page 596), which consists of a classifier pre-desludging the old sand / water mixture, at least one rubbing washer with several attraction cells, one of these downstream classifiers and a dryer which absorbs the desludged and, if necessary, washed regenerated sand.
  • a device DE- Magazine "Giesserei” 1972, page 596
  • such a device is characterized in that at least two friction washers, each with a maximum of three attraction cells, are connected in series and a classifier for desludging the mixture is arranged between successive friction washers.
  • the classifiers can be designed as trough classifiers or upflow classifiers (hydrose parators), optionally also in combination with one another.
  • the friction washer system preferably consists of two attraction cells, and preferably two or more such washer systems are connected in series.
  • Spiral classifiers have proven to be particularly favorable for achieving an effective desludging and for setting an optimal solids content, which ensures an efficient friction effect.
  • the classifier arranged behind the last friction washing system is followed by a scrubber for the regenerated sand, from which the processed sand then reaches the dryer in order to be subsequently fed to the sand cycle.
  • the scrubber can be a washing centrifuge, which also performs the dewatering.
  • this is behind the last rubbing wash System arranged classifier or the scrubber for the regenerated sand downstream of a clarification device, the water drain is connected to the used sand feed before the first classifier and possibly the scrubber for the regenerated sand.
  • the fresh water compensating for the water losses is expediently added to the scrubber.
  • the sludge obtained in the classifiers, the washer and the clarifier can be fed to a rotary kiln after drying, where it can be thermally cleaned at temperatures between 800 and 1500 degrees Celsius and the residue deposited.
  • I schematically indicates a sand preparation in which the old sand is crushed in a conventional manner and cleaned of metal parts by means of magnetic separators.
  • the old sand pretreated in this way is temporarily stored in a silo 1, from which it reaches a mixing container 3 by means of a metering screw 2.
  • the old sand is mixed with water in the mixing container 3, suctioned off by means of a pump 4 and fed to a first spiral classifier 6 via a line 5.
  • the pre-desludged used sand arrives in a first two-cell attrition machine 7.
  • these, as well as all subsequent attraction machines each have three sets, each with six paddles, which set the used sand / water mixture in an intensive stirring motion, so that binders and others Residues can be rubbed off from the grain of sand.
  • the mixture is again fed to a spiral classifier 8, water still being supplied in small quantities and the thin sludge excreted in the spiral classifier, while the wet old sand in the second attraction machine 9 is forwarded to repeat the scrubbing process.
  • the resulting fine fraction is removed in the third spiral classifier 10 as thin sludge.
  • the regenerated sand passes through an intermediate container 11, in which water may optionally be added, and from there by means of a pump 12 into a washing centrifuge 13.
  • water is again supplied in order to wash out the regenerated sand.
  • the regenerated sand leaves the washing centrifuge and arrives on a conveyor belt 14 which transports the regenerated sand into a dryer, e.g. B. promotes an oscillating dryer 15.
  • the regenerated sand leaves the oscillating dryer 15 via a sieve 15 a and is pneumatically transported, for example in a line 16, to the new sand bunker.
  • the thin sludge obtained at the spiral classifiers 6, 8, 10 passes via the line 17 into a thin sludge collector 18, into which the waste water from the washing centrifuge 13 is also fed.
  • a thin sludge collector 18 into which the waste water from the washing centrifuge 13 is also fed.
  • the dust accumulating in the oscillating dryer 15 and deposited by wet dedusting in the dust extractor 15 b can also be introduced.
  • the thin sludge is pump 19 into a clarifier 20, for. B. transferred a lamella clarifier, the sludge discharge is connected to a decanter 21, 22. This is where the dewatered sludge accumulates, which is brought to landfill 22 a.
  • This sludge can optionally also be dried beforehand and burned out in a rotary tube furnace, not shown, in order to separate off any organic constituents which may still be present and, if appropriate, to afterburn.
  • the residue from the rotary kiln is then deposited in landfill 22 a after cooling.
  • the clarified water obtained at the lamella clarifier 20 and at the decanting device 21, 22 is pumped via line 25 returned to the regeneration system with the addition of fresh water via line 26.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Processing Of Solid Wastes (AREA)
EP87111654A 1986-08-21 1987-08-12 Procédé et dispositif de régénération par voie humide de sable de fonderie usé Withdrawn EP0257446A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT224686A AT387921B (de) 1986-08-21 1986-08-21 Verfahren und vorrichtung zur nassen regenerierung von tongebundenen giesserei-altsanden
AT2246/86 1986-08-21

Publications (2)

Publication Number Publication Date
EP0257446A2 true EP0257446A2 (fr) 1988-03-02
EP0257446A3 EP0257446A3 (fr) 1988-05-11

Family

ID=3530744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111654A Withdrawn EP0257446A3 (fr) 1986-08-21 1987-08-12 Procédé et dispositif de régénération par voie humide de sable de fonderie usé

Country Status (2)

Country Link
EP (1) EP0257446A3 (fr)
AT (1) AT387921B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017127996A1 (fr) * 2016-01-25 2017-08-03 苏州明志科技有限公司 Unité de fabrication de noyau à poste unique et son procédé d'installation
CN114130949A (zh) * 2021-12-10 2022-03-04 南阳仁创再生资源有限公司 一种降低水洗铸造陶粒砂灼减量的再生方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991014524A1 (fr) * 1990-03-20 1991-10-03 Küttner Gmbh & Co. Kg Procede pour la regeneration de vieux sable de fonderie
DE4321297C2 (de) * 1993-06-26 1999-06-17 Krc Umwelttechnik Gmbh Verfahren zur nassen Regenerierung von mit Verunreinigungen und Schadstoffen belasteten körnigen Schüttgütern
DE4321296A1 (de) * 1993-06-26 1995-01-05 Noell Abfall & Energietech Verfahren und Anlage zur nassen Regenerierung von mit Verunreinigungen und Schadstoffen belasteten körnigen Schüttgütern

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2783511A (en) * 1954-02-01 1957-03-05 Hydro Blast Corp Method for reclaiming used foundry sand
DE3019096A1 (de) * 1979-06-06 1981-02-05 Foundry Design Corp Europ Verfahren und anlage zum nassentsanden und reinigen von gusstuecken

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2783511A (en) * 1954-02-01 1957-03-05 Hydro Blast Corp Method for reclaiming used foundry sand
DE3019096A1 (de) * 1979-06-06 1981-02-05 Foundry Design Corp Europ Verfahren und anlage zum nassentsanden und reinigen von gusstuecken

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
GIEBEREI, Jahrgang 59, Nr. 20, 5. Oktober 1972, Chikago, USA HENRY W. ZIMNAWODA "Verfahren zur Sandruckgewinnung" seiten 593-599 *
GIEBEREI-RUNDSCHAU, Jahrgang 31, Nr. 4, April 1984, Wien H. SAGMEISTER "Versuche zur Regenerierung von Bentonitgebundenen Altformstoffen fur die Kernherstellung" seiten 11-16 & Gieberei-Praxis, Nr. 12, 22. Juni 1984, Fachverlag Schiele & Schon GmbH, Berlin H. SAGMEISTER "Versuche zur Regenerierung von Bentonitgebundenen Altformstoffen fur die Kernherstellung" seiten 206-211 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017127996A1 (fr) * 2016-01-25 2017-08-03 苏州明志科技有限公司 Unité de fabrication de noyau à poste unique et son procédé d'installation
CN114130949A (zh) * 2021-12-10 2022-03-04 南阳仁创再生资源有限公司 一种降低水洗铸造陶粒砂灼减量的再生方法

Also Published As

Publication number Publication date
EP0257446A3 (fr) 1988-05-11
ATA224686A (de) 1988-09-15
AT387921B (de) 1989-04-10

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