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WO2014111334A2 - Procédé pour former une couverture sur un métal en fusion et matière de couverture - Google Patents

Procédé pour former une couverture sur un métal en fusion et matière de couverture Download PDF

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Publication number
WO2014111334A2
WO2014111334A2 PCT/EP2014/050455 EP2014050455W WO2014111334A2 WO 2014111334 A2 WO2014111334 A2 WO 2014111334A2 EP 2014050455 W EP2014050455 W EP 2014050455W WO 2014111334 A2 WO2014111334 A2 WO 2014111334A2
Authority
WO
WIPO (PCT)
Prior art keywords
granules
molten metal
filter cake
covering
diatomaceous earth
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.)
Ceased
Application number
PCT/EP2014/050455
Other languages
German (de)
English (en)
Other versions
WO2014111334A3 (fr
Inventor
Hans-Peter Noack
Frank Schmidtgen
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP14701925.1A priority Critical patent/EP2946023A2/fr
Publication of WO2014111334A2 publication Critical patent/WO2014111334A2/fr
Publication of WO2014111334A3 publication Critical patent/WO2014111334A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/006—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with use of an inert protective material including the use of an inert gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting

Definitions

  • the invention relates to a method for the insulating covering of a molten metal, wherein on the surface of the molten metal a silicon oxide-containing granules is applied.
  • the invention relates to a granulate as a covering means for a molten metal.
  • a granulate as a covering means for a molten metal.
  • the covering prevents the heat loss during the transport of the melt to a further processing device and ensures the pourability of the metal in continuous operation.
  • a possible and simple way of processing the covering means is the application of insulating bulk material to the molten metal.
  • the covering material should contain as little chemically bound water or water of crystallization and, depending on the steel quality, no or only little carbon.
  • a commonly used covering is rice husk ash, since it is very inexpensive to produce and has excellent insulation properties.
  • small particle size of the ash and their low bulk density are problematic.
  • the fine particles fly up, due to the heat convection, so that handling during production is difficult.
  • a uniform distribution of the material on the metal surface is difficult and it comes to unwanted dust.
  • the rice husk ash because of the content of crystalline silica, can also cause human silicosis once the fine particles enter the human body through the airways. Thus, the use of rice husk ash poses a health hazard.
  • DE 197 31 653 C2 proposes a method which provides for processing the rice husk ash into pellets or pellets, wherein the rice ash is first processed so that it consists of particles with a size of 0.044 mm and is subsequently mixed with a surface-active substance ,
  • the surfactant consists of sodium alginate, sodium salt of carboxymethyl cellulose, sodium hexametaphosphate and mixtures thereof.
  • Granulation or pelleting is carried out using common procedures at a process temperature between 800 and 1400 ° C.
  • DE 38 16 715 A1 discloses a method for covering melts by means of a granular mass which is produced from rice husk ash, a binder and a pore former.
  • Suitable pore formers are surfactants, metal oxides and hydrogen peroxide. The production of the granules takes place at temperatures up to 1200 ° C.
  • DE 101 24 926 B4 describes a process for the thermally insulating covering of a metal bath surface with a free-flowing aluminum silicate catalyst material which consists of at least 40% by weight of aluminum oxide and at least 40% by weight of silicon oxide.
  • a free-flowing aluminum silicate catalyst material which consists of at least 40% by weight of aluminum oxide and at least 40% by weight of silicon oxide.
  • intumescent expanded slate is suggested.
  • EP1602425 B1 discloses a process for the preparation of granules of amorphous silica powder which is pelleted by the addition of water in a ratio of solid to water of 1: 0.25 to 1: 1.5.
  • the object of the invention is to provide a masking agent for molten metals, which forms a uniform covering layer, is not hazardous to health and is inexpensive to produce.
  • the invention proposes a method for insulating cover of a molten metal according to claim 1 and a granulate according to claim 1 1 before.
  • a silicon oxide-containing, granulated covering agent is used, which consists mainly of diatomaceous earth.
  • the covering agent is easy to handle because, due to its granular nature, it can be easily metered and applied to the molten metal, which is e.g. in a steel distributor of a continuous casting plant or in a Stahlg devispfanne is, can be applied.
  • the covering agent Due to its low density and highly porous structure due to the high kieselguhr content, the covering agent also ensures excellent thermal insulation.
  • the granules used according to the invention contain up to 70 percent (weight percent), preferably up to 80 percent, more preferably up to 90 percent diatomaceous earth.
  • Other low specific gravity components may be included to adjust a desired bulk weight.
  • the granules contain nearly 100 percent kieselguhr, i. at least 90 percent.
  • a proportion of binder of only about 0.5 percent may be sufficient.
  • the granulate may contain as further constituent zeolites which prevent or at least slow down the melting of the granules on the molten metal.
  • the covering agent according to the invention can be obtained with advantage from the dry mass of filter materials, which are obtained as a waste product in the beverage industry. This can save costs for reprocessing or disposal. At the same time a cost-effective production of the cover is achieved.
  • the granulated material preferably has a particle size of 0.1 to 20 mm, particularly preferably 1 to 15 mm.
  • the compressive strength of the grains should be chosen so that they can be crushed, so that there is no risk of accident in the case of grains in areas of people.
  • the bulk density of the granules according to the invention is preferably between 0.2 and 0.6 kg / dm 3 , preferably between 0.3 and 0.4 kg / dm 3 . Due to the low bulk density is avoided that the covering sinks into a slag layer on the molten metal. In addition, even a comparatively thin layer of the covering material on the molten metal gives a good thermal insulation effect.
  • the cover material used according to the invention contains carbon, preferably up to 10 percent. Due to the content of carbon, the melting of the granules is delayed.
  • the granules can be produced from filter cakes from the beverage industry, which contain up to 90 percent kieselguhr and further constituents, such as perlite (eg up to 5 percent).
  • the filter material is preferably first pretreated, for example by pressing, to adjust the moisture content to about 30 to 50 percent, preferably 40 to 45 percent, particularly preferably 42 to 43 percent. This moisture content is good for granulating the material.
  • filter material may be pre-washed in an alkaline solution or in pure water (eg, in a counterflush) to remove any organic and other foreign matter that may be present.
  • the granulation of the filter cake is then carried out using a standard procedure for granulation (eg fluidized bed granulation), wherein the filter cake is added binder.
  • Bentonite, water glass, polyvinyl alcohol, polysaccharides or else cellulose or substances containing these substances are preferably used as binders.
  • the granules should be subjected to a drying process after their preparation.
  • the material should contain as little moisture (less than 5 percent, preferably less than 1 percent, particularly preferably less than 0.5 percent residual moisture) in the task on the molten metal.
  • a drying temperature of at least 150 ° C., preferably at least 200 ° C., is advantageous in order to drive off organic substances remaining in the material.
  • a dried filter cake can also be used as starting material. This is added to granulate according to water to adjust a suitable Granulierfeuchte.
  • the wet cake may advantageously be brought directly into a condition suitable for granulation (e.g., fluid bed granulation) by adding binder and water. Drying then takes place exclusively after granulation.
  • a condition suitable for granulation e.g., fluid bed granulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Silicon Compounds (AREA)

Abstract

L'invention concerne un procédé pour former une couverture isolante sur un métal en fusion, un granulat contenant de l'oxyde de silicium étant placé sur la surface du métal en fusion. Selon l'invention, le granulat contient de la terre de diatomées. L'invention porte également sur un granulat contenant de la terre de diatomées, utilisé comme matière de couverture pour un métal en fusion, un procédé de fabrication du granulat à partir de gâteaux de filtration contenant de la terre de diatomées ainsi que l'utilisation d'une matière filtrante contenant, dans la masse sèche, jusqu'à 90 % de terre de diatomées pour la fabrication d'un granulat destiné à la formation d'une couverture isolante sur un métal en fusion.
PCT/EP2014/050455 2013-01-15 2014-01-13 Procédé pour former une couverture sur un métal en fusion et matière de couverture Ceased WO2014111334A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14701925.1A EP2946023A2 (fr) 2013-01-15 2014-01-13 Procédé pour former une couverture sur un métal en fusion et matière de couverture

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013000527.2 2013-01-15
DE201310000527 DE102013000527A1 (de) 2013-01-15 2013-01-15 Verfahren zur Abdeckung einer Metallschmelze und Abdeckmaterial

Publications (2)

Publication Number Publication Date
WO2014111334A2 true WO2014111334A2 (fr) 2014-07-24
WO2014111334A3 WO2014111334A3 (fr) 2014-11-13

Family

ID=50030248

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/050455 Ceased WO2014111334A2 (fr) 2013-01-15 2014-01-13 Procédé pour former une couverture sur un métal en fusion et matière de couverture

Country Status (3)

Country Link
EP (1) EP2946023A2 (fr)
DE (2) DE102013000527A1 (fr)
WO (1) WO2014111334A2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016104391A1 (de) 2015-03-12 2016-09-15 Aalener Gesellschaft für Leichtbauteile mbH Abdeckmittel für eine Metallschmelze
DE102016112039B4 (de) 2016-06-30 2019-07-11 Refratechnik Holding Gmbh Wärmedämmende Platte, insbesondere Abdeckplatte für Metallschmelzen, sowie Verfahren zur Herstellung der Platte und deren Verwendung
DE102016015852B4 (de) 2016-06-30 2024-05-29 Refratechnik Holding Gmbh Verwendung eines wärmedämmenden Formkörpers
DE102016112042B4 (de) 2016-06-30 2019-10-02 Refratechnik Holding Gmbh Wärmedämmender, feuerfester Formkörper, insbesondere Platte, und Verfahren zu dessen Herstellung und dessen Verwendung
DE102016112044B4 (de) 2016-06-30 2019-01-03 Refratechnik Holding Gmbh Verwendung einer wärmedämmenden Platte zur Isolation von Metallschmelzen gegenüber der Atmosphäre oder einem metallurgischen Gefäß
CN109332608A (zh) * 2018-11-27 2019-02-15 沈劲松 用于高温制品的冶金工业用保温覆盖剂

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3816715A1 (de) 1988-05-17 1989-11-30 Alois Hehl Granulatartige masse
DE19731653C2 (de) 1997-07-23 2001-10-31 Council Of Scient & Ind Res Ne Verfahren zur Herstellung von Kügelchen oder Pellets aus Reisschalenasche sowie Kügelchen oder Pellets aus Reisschalenasche
DE10124926B4 (de) 2001-05-21 2006-03-16 Hans-Peter Noack Verwendung von Isoliermaterial für Metallbäder
EP1602425B1 (fr) 2004-05-29 2009-08-05 Stefanie Heller Poudre de couverture pour la coulée continue de métaux et sa méthode d'élaboration

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT198699B (de) * 1955-04-08 1958-07-25 Chemotechnik Anstalt Fuer Chem Verfahren zur Erhöhung des Ausbringens in der Gießerei
DE1519800A1 (de) * 1965-12-01 1970-02-26 Giesicke Basel Gmbh Getrocknete oder gebrannte vorbehandelte Kieselgur als Streumaterial
DE1558375A1 (de) * 1967-03-10 1970-03-19 Vitkovice Zelezarny Synthetisches schlackenbildendes Gemisch zum Rohblockkokillenguss
FR1529725A (fr) * 1967-04-21 1968-06-21 Ferrox France Perfectionnements aux plaquettes de masselotage pour ligotières
DE2410033C2 (de) * 1974-03-02 1975-09-11 Merck Patent Gmbh, 6100 Darmstadt Isolierung von in lipophilen Lösungsmitteln löslichen Inhaltstoffen wäßriger Lösungen
DE2530330A1 (de) * 1975-07-08 1977-01-27 Ferrocast Fa Schlackenbildendes giesspulver
SU679312A1 (ru) * 1977-05-20 1979-08-15 Институт Проблем Литья Ан Украинской Сср Теплоизолирующа смесь дл прибылей отливок
US4201606A (en) * 1977-07-19 1980-05-06 Foseco Trading Ag. Refractory exothermic heating insulating articles
JPS54117321A (en) * 1978-03-04 1979-09-12 Takeshi Shirohata Warmth keeping material of molten metal based on used filter aid
DE19911520C2 (de) * 1999-03-16 2003-08-14 Fne Gmbh Verfahren zur Herstellung einer Kieselgur als Filterhilfsmittel der Getränkeindustrie
EP2136913B1 (fr) * 2007-03-15 2018-04-25 Basf Se Procédé pour régénérer un adjuvant de filtration

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3816715A1 (de) 1988-05-17 1989-11-30 Alois Hehl Granulatartige masse
DE19731653C2 (de) 1997-07-23 2001-10-31 Council Of Scient & Ind Res Ne Verfahren zur Herstellung von Kügelchen oder Pellets aus Reisschalenasche sowie Kügelchen oder Pellets aus Reisschalenasche
DE10124926B4 (de) 2001-05-21 2006-03-16 Hans-Peter Noack Verwendung von Isoliermaterial für Metallbäder
EP1602425B1 (fr) 2004-05-29 2009-08-05 Stefanie Heller Poudre de couverture pour la coulée continue de métaux et sa méthode d'élaboration

Also Published As

Publication number Publication date
DE102013000527A1 (de) 2014-07-17
WO2014111334A3 (fr) 2014-11-13
EP2946023A2 (fr) 2015-11-25
DE202014011135U1 (de) 2018-01-25

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