EP0930113A1 - Schützendes Pulver für Schleudergussmaschinen zum Giessen von gusseisernen Rohren und Verfahren zur Hertellung des Pulvers - Google Patents

Schützendes Pulver für Schleudergussmaschinen zum Giessen von gusseisernen Rohren und Verfahren zur Hertellung des Pulvers Download PDF

Info

Publication number
EP0930113A1
EP0930113A1 EP99420004A EP99420004A EP0930113A1 EP 0930113 A1 EP0930113 A1 EP 0930113A1 EP 99420004 A EP99420004 A EP 99420004A EP 99420004 A EP99420004 A EP 99420004A EP 0930113 A1 EP0930113 A1 EP 0930113A1
Authority
EP
European Patent Office
Prior art keywords
powder
silicon
cast iron
product according
mineral
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Withdrawn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
EP99420004A
Other languages
English (en)
French (fr)
Inventor
Thomas Margaria
Rolnad Siclari
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.)
Ferropem SAS
Original Assignee
Pechiney Electrometallurgie SAS
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 Pechiney Electrometallurgie SAS filed Critical Pechiney Electrometallurgie SAS
Publication of EP0930113A1 publication Critical patent/EP0930113A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
    • B22D13/101—Moulds
    • B22D13/102—Linings for moulds

Definitions

  • the invention relates to a powder product intended for the protection of molds (often referred to as "shells") for centrifugal casting cast iron pipes.
  • Products used for the protection (also called poteyage) of shells of centrifugal casting of cast iron pipes are in powder form containing an inoculating alloy intended for the treatment of the external surface of the pipe.
  • This alloy is most often based on ferro-silicon, possibly alloyed with calcium, aluminum and / or strontium and sometimes other elements such as manganese or zirconium.
  • Silicon and calcium can also be provided under form of a silicon-calcium alloy. They also contain mineral powders inert such as carbon, silica, fluorspar or other fluorinated compounds, including the role is to facilitate the detachment of the pipe at the end of casting.
  • the industrial synthesis of silicones is carried out from alkyl- or aryl-halosilanes, in particular dimethyldichlorosilane, obtained by reaction of a contact mass based on powdered metallurgical silicon with methyl chloride, at a temperature between 300 and 350 ° C, in the presence of a catalyst containing copper and optionally tin.
  • This reaction known under the name of Rochow reaction, is used worldwide and leaves significant quantities of residues, called spent contact masses, appearing in the form of sludges containing various metallic elements in the form of silicides, silicates or oxides.
  • spent masses which ceased to be reactive under the conditions of the Rochow reaction, remain reactive in air and their landfilling requires prior passivation treatment.
  • Elkem's patent application EP 0786532 describes the manufacture of briquettes made of residues based on silicon mixed with cardboard, hydraulic cement and a ferro-alloy, and usable as metallurgical additive.
  • Application EP 0794160 from the applicant describes the recycling of spent masses in the form of a refractory powder based on silicon nitride which, mixed with an organic binder, makes it possible to produce plugs for tap holes for blast furnaces or electric metallurgy ovens.
  • silicone production due to the significant development of silicone production, it remains necessary to find other possibilities for recycling used materials.
  • the waste masses recovered at the outlet of the reactor are first treated, for example by means of a sulfuric acid solution containing from 15 to 50% by weight of pure acid, at a temperature between 20 and 100 ° C. Tin and copper are eliminated in the form of sulfates which can be reused.
  • the insoluble fraction that is to say the purified mass, is then dried and then takes the form of a powder with a particle size of less than 0.1 mm.
  • the content of non-oxidized silicon is very variable and this variability is a major obstacle to its recycling in industrial applications requiring a minimum of reproducibility.
  • the quality obtained should be checked at each stage of the process, which requires both an evaluation test of the inoculating power of the base material and a specific application test for the protection of centrifugal casting shells.
  • a melting crucible is treated in an induction furnace by adding 1 % by weight of base material, then poured into a sand mold to obtain test pieces of different thicknesses.
  • the quenching thickness that is to say the thickness of the skin of pearlitic structure around the core of the piece of ferritic structure, is checked on these test pieces, by optical microscopy.
  • liquid cast iron is poured into a fixed cylindrical mold with a vertical axis of porous sintered metal, the outer part of which is surrounded by an envelope waterproof allowing the vacuum to be drawn on the outside of the mold.
  • This device makes it possible to maintain the protective powder of product to be tested on the internal surface of the mold, and thus to prevent this powder from being swept away by the flow of liquid cast iron at the time of casting.
  • a cylindrical core of agglomerated sand placed in a coaxial position makes it possible to obtain the toric shape simulating that of a pipe.
  • the internal face of the mold is produced at an angle of 2 degrees to facilitate demolding.
  • the quality of the products tested is assessed in relation to the release time of the part under the sole action of gravity, and the depth of quenching observed on the outer skin of the part.
  • the test is carried out with a constant dosage of product to be tested of 200 g / m 2 .
  • the liquid cast iron required for the test is treated beforehand at 1550 ° C. by adding 14 g / kg of nickel-magnesium alloy cast iron to 15% magnesium.
  • the inoculating power of this alloy is tested by treating with 30 g of alloy 3 kg of Sorel cast iron melted at 1400 ° C in an induction furnace, and by casting this cast iron within 5 minutes following its treatment in a sand mold for obtain 20, 10, 5 and 2 mm thick test pieces.
  • test pieces is entirely perlitic for the two thinner ones, the perlite thickness being 3 mm on the 20 mm thick test piece and 4 mm on the 10 mm thick test piece.
  • a mixture consisting of 90% by weight of the preceding inoculating alloy and 10% of silica powder with a particle size between 50 and 100 ⁇ m is then prepared. This mixture is tested for shell protection in a vertical cylindrical mold with a diameter of 90 mm and a height of 130 mm, with a central graphite core with a diameter of 70 mm. The part obtained is released by gravity 20 s after the end of the casting and the thickness of perlite on the external surface is 2 mm.
  • Residues from the manufacture of dichloromethylsilane were collected at the outlet of a synthesis reactor and are treated with a sulfuric acid solution to remove the tin and copper.
  • the mixture is tested as an inoculant under the same conditions as in Example 1.
  • test pieces is completely perlitic for the thicknesses 2 and 5 mm, and that the thickness of perlite is respectively 3 and 2 mm for thicknesses of 10 and 20 mm.
  • the mixture without the addition of any other product, is then tested as a product for protecting the pipe casting shells under conditions identical to those of Example 1.
  • the casting is released from the mold 18 s after the end of the casting and the thickness of perlite on the external face is evaluated at 1.5 mm. It is therefore found that this product provides slightly better protection than that of Example 1.
EP99420004A 1998-01-16 1999-01-12 Schützendes Pulver für Schleudergussmaschinen zum Giessen von gusseisernen Rohren und Verfahren zur Hertellung des Pulvers Withdrawn EP0930113A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9800628A FR2773728B1 (fr) 1998-01-16 1998-01-16 Produit en poudre pour la protection des moules de coulee centrifuge des tuyaux de fonte et procede de preparation de ce produit
FR9800628 1998-01-16

Publications (1)

Publication Number Publication Date
EP0930113A1 true EP0930113A1 (de) 1999-07-21

Family

ID=9522004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99420004A Withdrawn EP0930113A1 (de) 1998-01-16 1999-01-12 Schützendes Pulver für Schleudergussmaschinen zum Giessen von gusseisernen Rohren und Verfahren zur Hertellung des Pulvers

Country Status (4)

Country Link
US (1) US6338753B1 (de)
EP (1) EP0930113A1 (de)
JP (1) JPH11277210A (de)
FR (1) FR2773728B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006100375A1 (fr) * 2005-03-22 2006-09-28 Pechiney Electrometallurgie Produits du type « dry-spray » pour la protection des moules de coulee centrifuee des tuyaux de fonte
CN106312070A (zh) * 2016-08-09 2017-01-11 兰州理工大学 金属胎体金刚石工具烧压石墨模具用碳基分型剂及其制备方法和使用方法
EP1575724B1 (de) * 2002-01-25 2018-08-01 Ferropem Produkte zum schutz von stranggussformen für gusseiserne rohre

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2884739B1 (fr) * 2005-04-20 2007-06-29 Pechiney Electrometallurgie So Produits du type "dry-spray" pour la protection des moules de coulee centrifugee des tuyaux de fonte, en association avec un produit du type "wet-spray"
CN100352576C (zh) * 2006-05-23 2007-12-05 武汉重工铸锻有限责任公司 型砂及其制备方法
CN105081257A (zh) * 2015-08-05 2015-11-25 苏州好洁清洁器具有限公司 一种复合型铝合金管材
CN105886883B (zh) * 2016-05-31 2017-08-04 含山县兴达球墨铸铁厂 孕育剂及其制备方法和在球墨铸铁的应用

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058153A (en) * 1974-07-18 1977-11-15 Pont-A-Mousson S.A. Process for centrifugally casting spheroidal graphite cast iron pipes
EP0201200A1 (de) * 1985-04-09 1986-11-12 Toray Silicone Company, Ltd. Verfahren zur Behandlung von aktiviertem Siliciumpulver
EP0675077A2 (de) * 1994-03-30 1995-10-04 Elkem A/S Verfahren zur Rückgewinnung von Metallchloriden aus Silicium oder Ferrosiliciumlegierungen, die mit Chlorierungsmitteln reagiert haben
WO1995026926A1 (en) * 1994-03-30 1995-10-12 Elkem A/S Method for upgrading of silicon-containing residues obtained after leaching of copper-containing residues from chlorosilane synthesis
WO1995027086A1 (en) * 1994-03-30 1995-10-12 Elkem A/S Method for treatment of residues from organochlorosilane and/or chlorosilansynthesis
EP0727389A2 (de) * 1995-02-15 1996-08-21 Dow Corning Corporation Verfahren zur Rückgewinnung teilchenförmigen Siliciums aus einem Nebenproduktstrom
EP0786532A2 (de) * 1996-01-24 1997-07-30 Elkem ASA Siliziumhaltige Rückstände enthaltendes Brikett als Additiv für metallurgische Zwecke und Verfahren zu seiner Herstellung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2745562B1 (fr) * 1996-03-04 1998-04-17 Pechiney Electrometallurgie Procede de preparation d'une poudre refractaire a partir de masses de contact usees issues de la production de silanes et produits refractaires obtenus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058153A (en) * 1974-07-18 1977-11-15 Pont-A-Mousson S.A. Process for centrifugally casting spheroidal graphite cast iron pipes
EP0201200A1 (de) * 1985-04-09 1986-11-12 Toray Silicone Company, Ltd. Verfahren zur Behandlung von aktiviertem Siliciumpulver
EP0675077A2 (de) * 1994-03-30 1995-10-04 Elkem A/S Verfahren zur Rückgewinnung von Metallchloriden aus Silicium oder Ferrosiliciumlegierungen, die mit Chlorierungsmitteln reagiert haben
WO1995026926A1 (en) * 1994-03-30 1995-10-12 Elkem A/S Method for upgrading of silicon-containing residues obtained after leaching of copper-containing residues from chlorosilane synthesis
WO1995027086A1 (en) * 1994-03-30 1995-10-12 Elkem A/S Method for treatment of residues from organochlorosilane and/or chlorosilansynthesis
EP0727389A2 (de) * 1995-02-15 1996-08-21 Dow Corning Corporation Verfahren zur Rückgewinnung teilchenförmigen Siliciums aus einem Nebenproduktstrom
EP0786532A2 (de) * 1996-01-24 1997-07-30 Elkem ASA Siliziumhaltige Rückstände enthaltendes Brikett als Additiv für metallurgische Zwecke und Verfahren zu seiner Herstellung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1575724B1 (de) * 2002-01-25 2018-08-01 Ferropem Produkte zum schutz von stranggussformen für gusseiserne rohre
WO2006100375A1 (fr) * 2005-03-22 2006-09-28 Pechiney Electrometallurgie Produits du type « dry-spray » pour la protection des moules de coulee centrifuee des tuyaux de fonte
FR2883495A1 (fr) * 2005-03-22 2006-09-29 Pechiney Electrometallurgie So Produits du type "dry-spray" pour la protection des moules de coulee centrifugee des tuyaux de fonte
US7896961B2 (en) 2005-03-22 2011-03-01 Pechiney Electrometallurgie Products of the dry-spray type, for the protection of centrifugal casting molds for cast iron pipes
CN106312070A (zh) * 2016-08-09 2017-01-11 兰州理工大学 金属胎体金刚石工具烧压石墨模具用碳基分型剂及其制备方法和使用方法

Also Published As

Publication number Publication date
FR2773728A1 (fr) 1999-07-23
US6338753B1 (en) 2002-01-15
FR2773728B1 (fr) 2000-03-17
JPH11277210A (ja) 1999-10-12

Similar Documents

Publication Publication Date Title
FI84595B (fi) Framstaellningsprocess foer eldfast massa och bestaondsdelsblandning foer bildning av saodan massa.
EP0358751B1 (de) Elektrisch geschmolzenes mehrphasiges material auf der basis von aluminiumoxid, aluminiumoxycarbid und aluminiumoxynitrid
EP0930113A1 (de) Schützendes Pulver für Schleudergussmaschinen zum Giessen von gusseisernen Rohren und Verfahren zur Hertellung des Pulvers
EP0110809B1 (de) Verfahren und Vorrichtung zur Behandlung von Stahl in der Pfanne
CA2474273C (fr) Produits pour la protection des moules de coulee continue des tuyaux de fonte
FR2814757A1 (fr) Elaboration d'alliages de type aluminium-silicium
WO2001090019A1 (fr) Procede de traitement oxydant des laitiers d'acierie et scories ld obtenues
EP0720967B1 (de) Metallurgisches Silizium und Ferrosilizium mit niedrigem Sauerstoffgehalt
EP0794160B1 (de) Verfahren zur Herstellung eines feuerfesten Pulvers aus gebrauchten Kontaktmassen der Silanherstellung und hergestellte feuerfeste Produkte
EP0342132A1 (de) Verfahren zur Entschwefelung von Roheisen
EP0485309A1 (de) Beschichtete Magnesiumteilchen zur Entschwefelung von Gusseisen oder Flussstahl
FR2657604A1 (fr) Element faconne en ceramique refractaire et procede pour sa fabrication.
RU2706402C1 (ru) Способ получения огнеупорного изделия при алюмотермитном восстановлении металла
JP2003292383A (ja) 不定形耐火物の製造方法
JPH01319621A (ja) 純マグネシウムによる鋳鉄溶湯の処理方法
CH663963A5 (fr) Procede de preparation d'un alliage de base pour la fabrication de metal amorphe.
SU1638177A1 (ru) Способ производства слитков
EP0806258B1 (de) Neue isolierende Schicht für Metallform und Verfahren zur Herstellung einer solchen Schicht
FR2556623A1 (fr) Procede de moulage a modele perdu de metaux, moules pour la mise en oeuvre de ce procede et procede de fabrication de ces moules
FR2752243A1 (fr) Procede de preparation de granulats a partir de laitier liquide d'acierie
SU1560570A1 (ru) Способ рафинировани ферросилици от алюмини
WO2022106675A1 (fr) Procede et installation de purification de silicium a partir d'un melange issu de la decoupe de briques de silicium en plaquettes
FR2481691A1 (fr) Procede de recuit d'un produit refractaire coule, fondu par la chaleur
FR2537565A1 (fr) Materiau refractaire contenant du carbone
RU2098370C1 (ru) Способ обработки шлакового расплава

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE ES GB IT LI

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 19991216

AKX Designation fees paid

Free format text: CH DE ES GB IT LI

17Q First examination report despatched

Effective date: 20030225

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20040803