EP0446402A1 - Verfahren zum Wiederaufbereiten von Giessereisand - Google Patents

Verfahren zum Wiederaufbereiten von Giessereisand Download PDF

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Publication number
EP0446402A1
EP0446402A1 EP19900107984 EP90107984A EP0446402A1 EP 0446402 A1 EP0446402 A1 EP 0446402A1 EP 19900107984 EP19900107984 EP 19900107984 EP 90107984 A EP90107984 A EP 90107984A EP 0446402 A1 EP0446402 A1 EP 0446402A1
Authority
EP
European Patent Office
Prior art keywords
sand
regeneration
neutralization
neutralizing
added
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Withdrawn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
EP19900107984
Other languages
German (de)
English (en)
French (fr)
Inventor
Hermann W. Dr. Dipl.-Ing. Sommer
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.)
SRL SOMMER RECYCLING LAUTA GMBH
Original Assignee
ERE Emmer Recycling und Entsorgung 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 ERE Emmer Recycling und Entsorgung GmbH filed Critical ERE Emmer Recycling und Entsorgung GmbH
Publication of EP0446402A1 publication Critical patent/EP0446402A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • 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 recycling foundry sand.
  • Organically bound sand generally only needs to be regenerated thermally, provided that it does not contain basic, acidic or other disruptive components that cannot be burned or volatilized.
  • Inorganically bound mono or mixed sand in particular sand originally charged with bentonite, must be regenerated thermally and mechanically in order to produce a reusable sand.
  • regenerate has different properties compared to new sand such as pH, electrical conductivity, degree of oolithization, sludge content and the like. Properties of such regenerates are therefore more or less impaired, especially when used again in core production. Reduced usage properties of such regenerates result above all when used as synthetic resin-bonded core sand and have an impact on reduced strength, reduced processing time of the sand mixtures, increased binder consumption and the like.
  • the object on which the invention is based is to specify a method of the type outlined above with which thermally and / or mechanically regenerated sand is treated in such a way that it is subsequently similar or like new sand.
  • This object is achieved in that the organic binder-containing sand after thermal regeneration or the inorganic binder-containing sand after thermal and mechanical regeneration, depending on its pH after regeneration by a measuring process such as titration with a suitable base or acid is neutralized so that it finally has a pH between 6 and 8.
  • the essence of the proposal according to the invention is, in particular, to additionally, for example, neutralize and purify the grains of sand, such as quartz grains, originally charged with organic and / or inorganic binder (bentonite) after a thermal treatment and mechanical cleaning, in order in particular to adjust its pH and its to adjust electrical conductivity to the corresponding new sand values.
  • sand such as quartz grains
  • organic and / or inorganic binder bentonite
  • the thermal and mechanical treatment e.g. the organic bond is largely burned or e.g. the clay or bentonite was burnt to death and largely removed from the grain of sand and removed by mechanical cleaning.
  • the regenerates obtained in this way are then neutralized and cleaned wet in containers.
  • the mixture is stirred or circulated in the treatment tank.
  • the necessary amounts of neutralization additives can be determined particularly advantageously on 50 to 100 g sand samples by titration, specifically when the sand is in its thermal and optionally mechanical regeneration state.
  • the sand treated in this way shows a clearly clean appearance and properties that are the same as or similar to that of the new sand, as is evident from the following Examples I and II, compared with the binoculars previously.
  • the sand which has already been regenerated, is fed from a sand feed 1 into a neutralization container 3 for weight adjustment per batch via a belt scale 2.
  • a neutralization solution is pumped from a storage container 4 via a pump 5 into the neutralization container 3, controlled via a fill level indicator (not shown).
  • the goods are stirred or circulated in the container 3 with a schematically illustrated agitator.
  • the solution is suctioned off via a filter plate 6, a pump 7 and a filter 8 and returned to the storage container 4.
  • a refreshment of the used neutralization solution by means of rinsing or fresh water and addition of new acid or base takes place with the interposition of a container 16.
  • the neutralized regenerate is washed and cleaned by introducing rinsing solution from a storage container 13 into the container 3 while the stirring process continues.
  • the sand / rinse water mixture is then pumped from the container 3 into a cyclone 10 by a pump 9.
  • cyclone 10 sand and muddy water settle.
  • the sludge water is cleaned by a pump 11 in a filter 12 and then returned to the reservoir 13.
  • Used rinse water is filled with fresh water.
  • the settled, cleaned and neutralized sand from the cyclone 10 is dried using an oscillating dryer 14 and then transported to a storage bunker 15.
  • the neutralization and the rinsing or cleaning take place alternately in two closed circuits.
  • bases are added when neutralizing with acid and vice versa.
  • the belt scale can also fill several neutralization tanks via a distributor belt, whereby several cyclones can also be used.
  • the neutralization and cleaning process takes place in a closed cycle with the lowest possible water consumption.
  • the neutralization solution is drawn off from the container together with the detached sludge fractions and then passed through a filter to separate the sludge. If necessary, the filtered used neutralizing solution is refreshed with fresh acid or base and fresh water or rinsing water and used for the next treatment e.g. repeatedly returned to the cycle process via intermediate containers.
  • a further example of an inorganically bound mixed sand is shown below, represented by starting old sand, thermally and mechanically produced regenerate and its subsequent neutralization and cleaning.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Processing Of Solid Wastes (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Treatment Of Sludge (AREA)
EP19900107984 1990-02-14 1990-04-26 Verfahren zum Wiederaufbereiten von Giessereisand Withdrawn EP0446402A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4004553 1990-02-14
DE4004553A DE4004553C1 (no) 1990-02-14 1990-02-14

Publications (1)

Publication Number Publication Date
EP0446402A1 true EP0446402A1 (de) 1991-09-18

Family

ID=6400137

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900107984 Withdrawn EP0446402A1 (de) 1990-02-14 1990-04-26 Verfahren zum Wiederaufbereiten von Giessereisand

Country Status (15)

Country Link
EP (1) EP0446402A1 (no)
JP (1) JPH03238141A (no)
KR (1) KR910015345A (no)
CN (1) CN1054021A (no)
BR (1) BR9003152A (no)
CA (1) CA2022769A1 (no)
CS (1) CS219190A2 (no)
DD (1) DD297087A5 (no)
DE (1) DE4004553C1 (no)
DK (1) DK149890A (no)
FI (1) FI902822A (no)
HU (1) HUT58008A (no)
NO (1) NO902410L (no)
PL (1) PL285083A1 (no)
PT (1) PT94164A (no)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0613741A1 (de) * 1991-09-07 1994-09-07 ELINO INDUSTRIE-OFENBAU CARL HANF GmbH & CO. Verfahren und Vorrichtung zur Aufbereitung von bentonitgebundenem Giesserei-Altsand
DE19927107A1 (de) * 1999-06-14 2000-12-21 Fischer Georg Gmbh & Co Kg Verfahren und Vorrichtung zur Verminderung der Geruchsemissionen von Giessereianlagen
US11707777B2 (en) 2018-06-29 2023-07-25 Nemak, S.A.B. De C.V. Method for preparing a foundry sand mixture

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1222978A3 (en) * 2001-01-15 2007-10-17 Sintokogio, Ltd. A method for making sand covered with bentonite, the sand, and a method for recycling molding sand for a mold using the sand covered by bentonite
DE102007027298A1 (de) * 2007-06-11 2008-12-18 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Verfahren zur Aufbereitung von Formsand
CN102059319B (zh) * 2011-01-19 2012-12-19 昆明理工大学 一种树脂旧砂的联合再生方法
CN102500458B (zh) * 2011-11-28 2014-07-09 河海大学 一种洗沙方法及其专用装置
CN102615243B (zh) * 2012-03-27 2013-09-18 华中科技大学 一种铸造旧砂湿法间歇式再生方法及其设备
JP2016147287A (ja) * 2015-02-12 2016-08-18 マツダ株式会社 鋳物砂の再生方法および研磨装置
JP7142563B2 (ja) * 2018-12-26 2022-09-27 伊藤忠セラテック株式会社 回収砂の再生方法
EP3797896A1 (en) * 2019-09-27 2021-03-31 Finn Recycling OY Cleaning sand used at foundry

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2656672B1 (de) * 1976-12-15 1978-02-09 Daimler Benz Ag Verfahren beim regenerieren von kernsand
US4401638A (en) * 1981-12-21 1983-08-30 Materias Primas, Monterrey, S.A. Process for purifying silica sand
EP0130808A1 (en) * 1983-06-29 1985-01-09 British Industrial Sand Limited Chemical treatment of sand
EP0152230A1 (en) * 1984-02-03 1985-08-21 Steel Castings Research And Trade Association Reclamation of foundry sands

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US414388A (en) * 1889-11-05 emmens
DE2233111C3 (de) * 1972-07-06 1974-11-28 Hermann 2105 Seevetal Jacob Verfahren und Vorrichtung zum Regenerieren von kunstharzgebundenem Gießereialtsand
US4113510A (en) * 1974-06-07 1978-09-12 Societe D'applications De Procedes Industriels Et Chimiques S.A.P.I.C. Process for regenerating foundry sand
CA1050209A (en) * 1974-12-16 1979-03-13 Julius M. Bleuenstein Sand reclamation and purification
JPS5292823A (en) * 1976-02-02 1977-08-04 Hitachi Ltd Old sand cleaning reproduction process
CH631643A5 (de) * 1978-04-14 1982-08-31 Fischer Ag Georg Verfahren zur regenerierung von giesserei-altsand sowie einrichtung zur durchfuehrung des verfahrens und erzeugnis des verfahrens.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2656672B1 (de) * 1976-12-15 1978-02-09 Daimler Benz Ag Verfahren beim regenerieren von kernsand
US4401638A (en) * 1981-12-21 1983-08-30 Materias Primas, Monterrey, S.A. Process for purifying silica sand
EP0130808A1 (en) * 1983-06-29 1985-01-09 British Industrial Sand Limited Chemical treatment of sand
EP0152230A1 (en) * 1984-02-03 1985-08-21 Steel Castings Research And Trade Association Reclamation of foundry sands

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0613741A1 (de) * 1991-09-07 1994-09-07 ELINO INDUSTRIE-OFENBAU CARL HANF GmbH & CO. Verfahren und Vorrichtung zur Aufbereitung von bentonitgebundenem Giesserei-Altsand
DE19927107A1 (de) * 1999-06-14 2000-12-21 Fischer Georg Gmbh & Co Kg Verfahren und Vorrichtung zur Verminderung der Geruchsemissionen von Giessereianlagen
US11707777B2 (en) 2018-06-29 2023-07-25 Nemak, S.A.B. De C.V. Method for preparing a foundry sand mixture

Also Published As

Publication number Publication date
KR910015345A (ko) 1991-09-30
JPH03238141A (ja) 1991-10-23
HUT58008A (en) 1992-01-28
NO902410D0 (no) 1990-05-31
DE4004553C1 (no) 1991-10-10
FI902822A0 (fi) 1990-06-06
CN1054021A (zh) 1991-08-28
FI902822A (fi) 1991-08-15
NO902410L (no) 1991-08-15
DK149890A (da) 1991-08-15
DD297087A5 (de) 1992-01-02
CA2022769A1 (en) 1991-08-15
PL285083A1 (en) 1991-10-07
BR9003152A (pt) 1991-11-12
CS219190A2 (en) 1991-09-15
PT94164A (pt) 1991-09-30
DK149890D0 (da) 1990-06-19
HU903815D0 (en) 1990-11-28

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