EP1759787A1 - Procédé pour traiter les sables de moulage - Google Patents

Procédé pour traiter les sables de moulage Download PDF

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Publication number
EP1759787A1
EP1759787A1 EP06017026A EP06017026A EP1759787A1 EP 1759787 A1 EP1759787 A1 EP 1759787A1 EP 06017026 A EP06017026 A EP 06017026A EP 06017026 A EP06017026 A EP 06017026A EP 1759787 A1 EP1759787 A1 EP 1759787A1
Authority
EP
European Patent Office
Prior art keywords
sand
partial
partial flow
binder
stream
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Withdrawn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
EP06017026A
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German (de)
English (en)
Inventor
Bernd Dipl.-Ing. Federhen
Markus Jendrock
Heinz Schmidt
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.)
Klein Anlagenbau AG
Original Assignee
Klein Anlagenbau AG
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 Klein Anlagenbau AG filed Critical Klein Anlagenbau AG
Publication of EP1759787A1 publication Critical patent/EP1759787A1/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Withdrawn legal-status Critical Current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
    • 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
    • B22C5/06—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sieving or magnetic separating
    • 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 invention relates to a method for treating foundry mold materials containing core sand and binder.
  • binder encompasses a product which is capable of combining both similar and different substances.
  • the setting process is carried out by physical drying, by solidification or by a strong increase in viscosity - such as a melting process - or by chemical reactions.
  • bitumen and tar are binders in road construction for aggregates, and in the field of refractories, aluminum phosphates may be used as binders.
  • additives such as sand and gravel are set and cemented by hardening the water-borne binders.
  • binders have changed lately. For example, attempts are being made to replace hitherto customary organic binders in the casting area for cores - and in part also for molds - with inorganic binders which are non-toxic and are hardened without dehumidification by dehumidification. These are, for example, water glass, magnesium sulfate, sodium phosphate and similar substances.
  • the solidification of a closed sand in a core box of the casting industry sand binder mixture is done by dehumidification; For example, hot core boxes, microwaves or hot air conducted through the sand binder mixture into the core box are used.
  • the hard core can be removed from the castings, for example, by shaking, in a water bath or by high pressure water jets.
  • the inventor has set itself the goal of developing a method that makes it possible to regenerate core sand economically, which is provided with cured by moisture removal inorganic binders.
  • the core sand bound with inorganic / inorganic binder (s) is dry-separated after a casting process in still tempered state from castings formed thereby, dry-comminuted, and the tempered core sand is subdivided into two partial streams.
  • the one partial stream is buffered according to the invention and the other partial stream is regenerated.
  • the partial stream to be regenerated is fed to a liquid-containing reactor and the introduced sand is wet-regenerated until the grain surface has been sufficiently cleaned of binder residues and products of the casting process; then this partial stream is mixed with the other partial stream.
  • the second partial flow is dried according to the invention by the heat of the first partial flow.
  • the first partial flow is cooled by the heat of vaporization of the moisture of the second partial flow.
  • the first partial stream is passed through the heating of the second partial stream to the mixing temperature of the merged partial streams after cooling of the second partial stream and the second partial stream is subjected to a wet regeneration by its introduction into the reactor.
  • a cleaning of the grain surface of the introduced sand of binder residues and products of the casting process should be done by means of a liquid, in particular by water.
  • additives can be added to the water in a suitable amount, for example sodium hydroxide solution with waterglass binder.
  • the cleaning process can be mechanically supported according to the invention, for example by agitators, oscillations or ultrasonic radiators;
  • the processes triggered by these stations can also be used in combination.
  • the introduced with the tempered sand in the liquid heat increases the cleaning intensity in the reactor.
  • the bath temperature of the reactor should be controlled by means of a cooling device or with supplied fresh water.
  • Drained water can be cooled and, after removing the substances dissolved in the water, returned to the reactor as fresh water. Arising swaths are removed.
  • the amount of withdrawn for wet regeneration part or sand flow should be at least so large that after the combination of the two streams after the wet regeneration of that partial flow results in a sufficiently high sand quality for new casts.
  • the amount of the partial flow is limited by the heat content of the first subset, through which - as described - the wet-regenerated partial flow is to be dried.
  • the second partial stream - has at a sand temperature of about 200 ° C, the second partial stream - at a humidity of about 4% after wet regeneration - a share of about 40% of the total amount of sand. Also, to increase the second part of this current before addition to the first partial flow by means of sieve, centrifuge or the like. Facilities are deprived of free water.
  • the amount of withdrawn for the regeneration sub-stream S 2 should be selected so that after merging the two sand or streams S 1 , S 2 in the long-term cycle sufficiently good sand properties. Any resulting sand losses can be compensated with new sand and the regeneration effect can be supported.
  • sub-step F 2 the cleaning of the introduced sand takes place in a liquid; as such, water is suitable.
  • additives can be added to the water in a suitable amount, for example sodium hydroxide solution with waterglass binder.
  • This cleaning process can be mechanically supported, for example, by stirrers, oscillations and ultrasonic radiators.
  • the treatment may be batchwise or continuous.
  • the degree of drying is chosen so that the mixture of the completely dry sand or partial stream S 1 of the intermediate storage and the wet-regenerated sand or partial stream S 2 is free-flowing;
  • the composite of two sand or streams S 1 , S 2 sand stream can be handled with the usual facilities of a foundry.
  • step F 4 of sand drying ie the treatment of the sand grains with moist surfaces in a drying reactor, in which the sand grains do not or only very slightly heat; on the one hand there is a flow with dried cooler air in the fluidized bed or in the flow stream (step F 4.1 ), on the other hand, a flow of slightly heated air with low relative humidity in the air flow or fluidized bed (step F 4.2 ).
  • the sand is mixed with grains of a substance that absorbs the moisture from the surface of the sand grain (step F 4.3 ).
  • the sand is mixed with grains of a substance, which absorbs the moisture from the sand grain surface.
  • the grains consist of porous materials with a large internal surface area.
  • the grains of sand and the moisture-absorbing grains are separated, for example by sieving, if their dimension is greater than that of the grains of sand. So the drying takes place without heating the sand.
  • the dried sand is added to the untreated sand or partial stream S 1 . The residual moisture is distributed over the total sand amount.
  • the drying grains outside the sand cycle are deprived of the absorbed moisture.
  • Another way, shown by way of example, to reduce the surface moisture of the sand grains sufficiently, is to bring the wet sand grains with fibrous substances in contact.
  • the fibers absorb the moisture of the grains of sand and, when the sand has been separated from the fibrous materials, are dried, for example, by squeezing, air purging or similar steps, so that they can regain moisture from grains of sand.
  • the family tree of Fig. 4 illustrates another method, namely the regeneration of the core sand after the casting, before the core sand is cooled.
  • the sand S k separated from the castings M l as well as comminuted in station B1.
  • the entire still temperate amount of sand in zone E 1 is divided into two partial streams T 1 , T 2 .
  • the first partial flow T 1 of the sand S k is temporarily buffered in zone K, the second partial flow T 2 is wet-regenerated in a reactor NR, metered into zone Q and subsequently mixed again into the first partial flow T 1 in zone G 1 .
  • the sand in zone R is cooled to use temperature.
  • the screening and the removal of fines can be carried out before the separation into two partial streams T 1 , T 2 in the region of the zone E 1 or preferably after their combination or cooling, as shown in FIG. 4 with the stations C 1 and Z indicates.
  • water is suitable.
  • additives can be added to the water in a suitable amount, for example sodium hydroxide solution with waterglass binder.
  • the cleaning process can be mechanically assisted, e.g. by - also combined - use of agitators, oscillations or ultrasonic radiators.
  • the tempered sand of the partial flow T 2 introduced into the liquid heat increases the cleaning intensity in the reactor NR.
  • the bath temperature of the reactor NR can be controlled by means of a cooling device or with supplied fresh water.
  • Drained water can be cooled. After removing the substances dissolved in the water, it can be recycled to the reactor NR as fresh water. Arising swaths are removed.
  • the treatment is carried out batchwise or continuously.
  • the amount of partial stream T 2 removed for wet regeneration should be at least so great that, after the union of the two partial streams T 1 , T 2 or after the wet regeneration of the partial flow T 2 results in a sufficiently high sand quality for new casts.
  • the amount of the partial flow T 2 is limited by the heat content of the amount of the first partial flow T 1 , through which - - as described - the wet-regenerated substream T 2 is to be dried.
  • the partial flow T 2 which has a humidity of 4% after wet regeneration, have a share of about 40% of the total amount of sand.
  • the partial flow T 2 by means of a sieve, a centrifuge or similar. Free water systems are withdrawn before the partial flow T 2 is added to the partial flow T 1 again.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP06017026A 2005-08-31 2006-08-16 Procédé pour traiter les sables de moulage Withdrawn EP1759787A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510041519 DE102005041519A1 (de) 2005-08-31 2005-08-31 Verfahren zum Behandeln von Gießereiformstoffen

Publications (1)

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EP1759787A1 true EP1759787A1 (fr) 2007-03-07

Family

ID=37070974

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EP06017026A Withdrawn EP1759787A1 (fr) 2005-08-31 2006-08-16 Procédé pour traiter les sables de moulage

Country Status (2)

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EP (1) EP1759787A1 (fr)
DE (1) DE102005041519A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3586995B2 (fr) * 2018-06-29 2024-04-24 Nemak, S.A.B. de C.V. Procédé de préparation d'un mélange de sable de fonderie

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948447A (en) * 1974-08-07 1976-04-06 Hermann Jacob Process and arrangement for the regeneration of foundry sand
EP0465778A2 (fr) * 1990-06-28 1992-01-15 Fried. Krupp AG Hoesch-Krupp Procédé de récupération de sable décoché
DE4126976C1 (fr) * 1991-08-14 1993-01-07 Kuenkel-Wagner Gmbh & Co Kg, 3220 Alfeld, De

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948447A (en) * 1974-08-07 1976-04-06 Hermann Jacob Process and arrangement for the regeneration of foundry sand
EP0465778A2 (fr) * 1990-06-28 1992-01-15 Fried. Krupp AG Hoesch-Krupp Procédé de récupération de sable décoché
DE4126976C1 (fr) * 1991-08-14 1993-01-07 Kuenkel-Wagner Gmbh & Co Kg, 3220 Alfeld, De

Also Published As

Publication number Publication date
DE102005041519A1 (de) 2007-03-01

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