EP0111616B2 - Verwendung von Zusätzen für umweltfreundliche Giessereiformsande - Google Patents

Verwendung von Zusätzen für umweltfreundliche Giessereiformsande Download PDF

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Publication number
EP0111616B2
EP0111616B2 EP83100419A EP83100419A EP0111616B2 EP 0111616 B2 EP0111616 B2 EP 0111616B2 EP 83100419 A EP83100419 A EP 83100419A EP 83100419 A EP83100419 A EP 83100419A EP 0111616 B2 EP0111616 B2 EP 0111616B2
Authority
EP
European Patent Office
Prior art keywords
sand
use according
carbon
crystalline carbon
additives
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
EP83100419A
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German (de)
English (en)
French (fr)
Other versions
EP0111616B1 (de
EP0111616A1 (de
Inventor
Ewald 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.)
Iko Industriekohle & Co KG Te Marl-Sinsen B GmbH
Original Assignee
Iko Industriekohle & Co KG GmbH
Iko Industriekohle & Co KG GmbH
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6180663&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0111616(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Iko Industriekohle & Co KG GmbH, Iko Industriekohle & Co KG GmbH filed Critical Iko Industriekohle & Co KG GmbH
Priority to AT83100419T priority Critical patent/ATE22021T1/de
Publication of EP0111616A1 publication Critical patent/EP0111616A1/de
Application granted granted Critical
Publication of EP0111616B1 publication Critical patent/EP0111616B1/de
Publication of EP0111616B2 publication Critical patent/EP0111616B2/de
Anticipated expiration legal-status Critical
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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
    • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives

Definitions

  • the present invention relates to the use of additives for foundry molding sand compositions which not only bring improved results in terms of foundry technology, but in particular meet the requirements from an environmental point of view in the workplace much better.
  • thermoplastic in unfoamed form as unsubstituted. polymerized hydrocarbon, e.g. B. consists of polymers of styrene, ethylene or propylene (see also DE-A-1 952 357).
  • Another suggestion is to add to the foundry sand resins which are obtained as hydrocarbon polymers in the form of so-called petroleum resins in petroleum distillation (cf. DE-A-2 064 700).
  • the effect of the carbon-containing additives used hitherto is to be based on the volatilization of hydrocarbon compounds taking place under the conditions of the casting heat, after which the so-called glossy carbon separates above 650 ° C. after the formation of a reducing atmosphere.
  • the glossy carbon formed is intended to separate the liquid metal from the casting mold by encasing the grains of the casting mold sand.
  • coal dust with 25%, 30% and 35% volatile constituents was added. It has been found that coal dust with 10% volatile constituents causes sand to burn onto the castings formed. Partial burning of sand is observed even with coal dust with 15% and 20% volatile components. Only coal dust with 25% volatile components can no longer detect such a burn. As a result, the addition of coal dust with 28% to 30% volatile constituents is required with regard to the properties of hard coal dust as an additive to the molding sand (see Supplements Foundry and Metallurgy, Issue 4/1963, pp. 191-209).
  • coal dust in the wet ground sand affects the green tensile strength through fine coke formation, worsens the wet strength and increases the tension in the hot molding material due to the higher water requirements of the dust-containing sand.
  • the coal dusts are said to be highly volatile and contain more than 25% volatile constituents (see G confuseerei issue 18/1987, pp. 465-471).
  • the additives used according to the invention from crystalline carbon products with anthracite or lean coal are mixtures which have a volatile content of 0.5% to 10%, in which
  • the volatile constituent content relates to the amount of the natural product freed from the mineral constituents, namely as additives to clay-bound foundry molding sand compositions to form a protective layer between the molding sand compositions and the liquid metal while simultaneously reducing the gas formation during the casting process .
  • the additions with a are advantageous.
  • naturally occurring graphite minerals generally contain considerable amounts of mineral constituents which must be separated from them before they can be used in known flotation or chemical treatment processes before they can be used as additives for foundry mold sands.
  • the product purified in this way, which does not occur naturally in this pure form, is usually referred to as "natural graphite”.
  • the thermal gas load during the casting process for the molding sands which contain the additives (carbon carriers) used according to the invention the amount of gas released is significantly lower.
  • the flames when pouring the hot liquid metal into the molds as is the case with the use of the known additives z. B. is based on gas coal and is done by igniting the released volatile constituents in the molding sand, no longer occurs when using molding sands with the carbon carriers used as additives according to the invention.
  • the amounts of carbon carriers added to regenerate the molding sand can be reduced by 25 to 50%, with the result that the environmental impact in the foundry is reduced to a minimum.
  • the combination of the crystalline carbon products with anthracite or lean coal as an admixed carbon product has proven to be particularly advantageous.
  • Anthracite and lean coal react during the casting process at low temperatures (150 to 400 ° C) with the atmospheric oxygen present in the mold cavity, and very quickly create a reducing atmosphere, which is a prerequisite for the fact that the crystalline carbon products now also have very low losses or suffer after the casting process.
  • the additives to foundry sand compositions used according to the invention form an ideal protective layer between the liquid metal and the molding sand composition, thus preventing reactions between the molten metal and the molding sand.
  • a further advantage when using the additives (carbon carriers) used according to the invention is the low water requirement of the molding sand according to the invention thus formed during the preparation process, since the additives (carbon carriers) used according to the invention have a substantially smaller surface area than the conventional carbon compounds.
  • the flow and compression behavior of the molding sand mixed with the additives used according to the invention is also improved, since the additives (carbon carriers) used according to the invention considerably reduce the frictional resistance of the quartz grains coated with clay.
  • the molding sand and the additives used according to the invention the environmental impact in the foundry is considerably reduced.
  • approx. 70,000 t / year of carbon carriers additives to foundry sands on a carbon basis with a proportion of components that are volatile at casting temperatures of 38 to 40% are used, i.e. approx. 20,000 t / year hydrocarbon compounds are used in released the atmosphere.
  • 20,000 t / year of hydrocarbon compounds based on the volatile content of approx. 40%, correspond to 10 612 000 m 3 gas, 85 400 kg tar and 272 000 kg benzene.
  • the casting tends to form leaf ribs and it has been found that the higher the volatile constituents in the carbon carrier, the more the leaf rib formation increases.
  • Samples 1-5 show no leaf ribs, samples 6 and 7, on the other hand, have a strong tendency to leaf ribs, and samples 8 showed only weak deposits of leaf ribs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Detergent Compositions (AREA)
  • Dental Preparations (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
  • Seasonings (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
EP83100419A 1982-12-15 1983-01-18 Verwendung von Zusätzen für umweltfreundliche Giessereiformsande Expired - Lifetime EP0111616B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83100419T ATE22021T1 (de) 1982-12-15 1983-01-18 Verwendung von zusaetzen fuer umweltfreundliche giessereiformsande.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3246324A DE3246324C2 (de) 1982-12-15 1982-12-15 Verwendung von Kohlenstoffprodukten als Zusatz zu tongebundenen Gießereiformsandmassen
DE3246324 1982-12-15

Publications (3)

Publication Number Publication Date
EP0111616A1 EP0111616A1 (de) 1984-06-27
EP0111616B1 EP0111616B1 (de) 1986-09-10
EP0111616B2 true EP0111616B2 (de) 1992-10-21

Family

ID=6180663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83100419A Expired - Lifetime EP0111616B2 (de) 1982-12-15 1983-01-18 Verwendung von Zusätzen für umweltfreundliche Giessereiformsande

Country Status (6)

Country Link
EP (1) EP0111616B2 (cs)
AT (1) ATE22021T1 (cs)
DE (1) DE3246324C2 (cs)
DK (1) DK162265C (cs)
GR (1) GR79166B (cs)
IE (1) IE54891B1 (cs)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3614397A1 (de) * 1986-04-28 1987-10-29 Wolfgang Caspers Verfahren zum vermindern von emissionen, insbesondere von kohlenwasserstoff-verbindungen, beim giessen von metallen
DE3704726C3 (de) * 1987-02-14 1998-01-08 Iko Gmbh & Co Kg Verfahren zum Beschleunigen der Wasseradsorption von als Zuschlagstoff für Gießereiformsande verwendetem Bentonit
US5094289A (en) * 1990-09-19 1992-03-10 American Colloid Company Roasted carbon molding (foundry) sand and method of casting
US5215143A (en) * 1992-11-16 1993-06-01 American Colloid Company Non-porous carbon molding (foundry) sand and method of casting
RU2139769C1 (ru) * 1997-12-08 1999-10-20 Акционерное общество закрытого типа "Литаформ" Формовочный материал
HRP20040182A2 (en) 2001-08-14 2004-08-31 Climarotec Ges Fuer Raumklimat Method and metal casting case for reducing pollutant emissions in foundry practices
DE10205158A1 (de) * 2002-02-07 2003-08-21 Iko Minerals Gmbh Verfahren zum Herstellen eines insbesondere im Kreislauf geführten Formsandes für Gießereizwecke
RU2252104C2 (ru) * 2003-01-14 2005-05-20 Закрытое акционерное общество "Волжская независимая химическая компания" Формовочный материал
RU2372163C1 (ru) * 2008-04-21 2009-11-10 Закрытое акционерное общество Производственно-коммерческая фирма "Волжская независимая производственная компания" Формовочный материал
RU2393938C1 (ru) * 2009-05-18 2010-07-10 Дмитрий Васильевич Скарюкин Формовочный материал
DE102009041677A1 (de) 2009-09-16 2011-03-24 Süd-Chemie AG Gießereiadditiv auf Grafitbasis

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1169087B (de) * 1957-11-05 1964-04-30 Sulzer Ag Anwendung von Zusaetzen zur Giessformmasse zum Schutz der Randzone von Stahlgussstuecken gegen Randentkohlung
DE1952357A1 (de) * 1969-10-17 1971-04-29 Ravensberger Eisenhuette Zusatz fuer Formmassen als Ersatz fuer Kohlenstaeube zur Bildung von Glanzkohlenstoff in Giessformen
DE1925589A1 (de) * 1969-05-20 1970-11-26 Heinze & Co Dr Verfahren zur Herstellung von Formstoffen zur Fertigung von Kernen und Formen zum Giessen von Metallen
DE2064700A1 (de) * 1970-12-31 1972-07-27 Schuiling Metall Chemie N.V., Hengelo (Niederlande) Formstoffzsatz für Gießereisande
CH555789A (de) * 1971-06-10 1974-11-15 Fischer Ag Georg Verfahren zur herstellung von kohlenstoff-formkoerpern, insbesondere von giesskokillen.
DE2501872B1 (de) * 1975-01-15 1976-04-08 Mannesmann Ag Feuerfeste keramische masse
DE2638042A1 (de) * 1975-09-17 1977-03-24 Fischer Ag Georg Verfahren zur behandlung poroeser, koerniger grundstoffe, insbesondere zur herstellung von giessereisanden
JPS5817145B2 (ja) * 1978-12-05 1983-04-05 品川白煉瓦株式会社 黒鉛質耐火物
IT1209745B (it) * 1980-01-21 1989-08-30 Ind Chimica Carlo Laviosa Spa Materiale granulare per la preparazione di terre di formatura di fonderia e suo procedimento di produzione

Also Published As

Publication number Publication date
DK162265C (da) 1992-03-16
DE3246324C3 (de) 1994-07-14
GR79166B (cs) 1984-10-02
DE3246324A1 (de) 1984-07-19
DK575683D0 (da) 1983-12-14
DK162265B (da) 1991-10-07
IE54891B1 (en) 1990-03-14
DE3246324C2 (de) 1994-07-14
EP0111616B1 (de) 1986-09-10
DK575683A (da) 1984-06-16
ATE22021T1 (de) 1986-09-15
IE832968L (en) 1984-06-22
EP0111616A1 (de) 1984-06-27

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