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WO2000061319A1 - Element de recouvrement de base pour surfaces de bain de fusion et procede permettant de le produire - Google Patents

Element de recouvrement de base pour surfaces de bain de fusion et procede permettant de le produire Download PDF

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Publication number
WO2000061319A1
WO2000061319A1 PCT/AT2000/000080 AT0000080W WO0061319A1 WO 2000061319 A1 WO2000061319 A1 WO 2000061319A1 AT 0000080 W AT0000080 W AT 0000080W WO 0061319 A1 WO0061319 A1 WO 0061319A1
Authority
WO
WIPO (PCT)
Prior art keywords
basic
weight
carrier material
balls
covering agent
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/AT2000/000080
Other languages
German (de)
English (en)
Inventor
Manfred Lechner
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.)
Styromagnesit Steirische Magnesitindustrie GmbH
Original Assignee
Styromagnesit Steirische Magnesitindustrie 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 Styromagnesit Steirische Magnesitindustrie GmbH filed Critical Styromagnesit Steirische Magnesitindustrie GmbH
Publication of WO2000061319A1 publication Critical patent/WO2000061319A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/12—Appurtenances, e.g. for sintering, for preventing splashing
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/30—Fluxes or coverings on molten baths

Definitions

  • the invention relates to a basic covering agent for molten bath surfaces for sealing the melt, in particular steel melt against atmospheric attack, and to a method for producing such a basic covering agent.
  • Covering agents are intended to prevent the immediate contact of molten pool surfaces with the atmosphere.
  • charcoal has already been proposed as a covering agent.
  • Melting baths made of magnesium alloy have already been successfully mixed with sulfur bleeding as a covering agent, salt mixtures, for example of cryolite and alkali metal chlorides or carbonates, being used for melting aluminum alloys. Quartz sand has also been used as a covering agent for cast iron.
  • Rice shell ash is currently mainly used as a covering agent, which has excellent insulating properties due to its very low liter weight.
  • a disadvantage of rice husk ash is a relatively high proportion of free SiO 2 and a certain proportion of freer carbon.
  • Another disadvantage of rice husk ash is the attack of the basic-lined slag zone in steel pans due to the SiO 2 content, and the high repair costs that this entails.
  • Basic masking agents have hitherto been used as basic masking powders and mostly produced from approximately equal parts of caustic-fired magnesite or caustic and talc by mixing.
  • the two components of this known covering powder are ground to a high fineness in order to achieve liter weights of approximately 450 g / 1.
  • the basic covering agent according to the invention essentially consists in the fact that basic material, such as, for example, caustic burned magnesite, is present as a shell on an inert carrier material, such as, for example, blown glass balls. Due to the fact that basic material is present as a shell on an inert carrier material, dry granulate is provided which tends to have a much lower tendency to pack up and, due to its grain size, exhibits improved flow behavior.
  • the basic material is present as a shell on the inert carrier material, the formation of dust during application and processing is also significantly reduced compared to known covering agents.
  • the product can also be designed such that the granules melt on contact with a molten steel and in this way form a lid. In this way, a very high thermal insulation ability and a complete seal against oxygen access to the steel bad guaranteed.
  • the basic covering powder according to the invention advantageously has no free SiO 2, a free carbon content of ⁇ 1% by weight and no free water. With a high proportion of basic active ingredients, this covering powder can protect the basic lining of the steel pans in the melting zone and thus significantly reduce their repair costs.
  • the basic covering agent according to the invention is advantageously designed such that the granulated coated product has a moisture content of less than 1% by weight and a liter weight of 450-550 g / 1, in particular 480 g / 1 to 520 g / 1, preferably the Grain of the product is between 0 and 10 mm.
  • the formation is advantageously made such that the softening temperature is below 1350 ° C., preferably between 1200 ° C. and 1250 ° C.
  • a particularly advantageous method for producing such a basic covering agent is essentially characterized in that carrier material balls with a diameter between 1 and 5 mm are mixed with water and basic material is stirred in, whereupon the granules are removed from the mixer and dried.
  • carrier material balls with a diameter between 1 and 5 mm are mixed with water and basic material is stirred in, whereupon the granules are removed from the mixer and dried.
  • the best results were achieved with blown glass balls, whereby blown clay balls, vermiculite or pearlite were used in comparative experiments.
  • porous materials such as clay balls, vermiculite and pearlite, showed undesirable explosions of the causal coating and in some cases even of the carrier material body particles themselves during the drying after granulation.
  • Such porous materials absorb relatively high amounts of moisture when coated with the coating Drying is released in vapor form. Enveloped glass spheres and in particular enveloped blown glass spheres remained _ -
  • C-containing binders e.g. molasses, stearic acid, cellulose
  • binders e.g. molasses, stearic acid, cellulose
  • the process according to the invention is advantageously carried out in such a way that the addition of the basic material is carried out gradually in amounts which are smaller than the weight of the support material balls used and the total weight of the basic material added is greater than three times, preferably 4 to 5 times the weight of the carrier material insert is selected.
  • a product manufactured in this way was distinguished by a particularly light grain and good flowability, and after drying, residual moisture contents of well below 1% could be achieved without impairing the casing.
  • the procedure is such that the addition of the basic material is carried out in at least 5, preferably 10 to 12 steps after stirring for 20 to 120 seconds each, whereby the corresponding amount of basic material is applied in the same layer thickness can.
  • the procedure is advantageously such that water is used in an amount by weight of 1.5 to 2.5 times the weight of the carrier material balls used, in particular blown glass balls.
  • the products obtained in this way are characterized by chemically inert material and dry granules. Due to the encapsulation of the carrier material particles, no free SiO 2 is formed even when blown glass is used and overall thermal insulation is achieved.
  • the granules could then be emptied from the mixture and fed to the drying process.
  • the product obtained had a mixing weight of 44 kg. After drying at 110 ° C., a residual moisture of 0.5% by weight and a bulk density of 480 g / 1 were determined.
  • the mixture had a mixture weight of 51 kg. After drying at 110 ° C., the moisture was again determined to be 0.5% by weight and the bulk density was 520 g / l.
  • the products produced in this way were suitable as basic products and had grain sizes between 0 and 10 mm.
  • the processing resulted in largely dust-free products, whereby a small amount of dust is possible due to abrasion.
  • the products produced are characterized by good flow properties, good flow properties on a flat surface and a specific weight in the order of about 500 g / 1, with no free SiO 2.
  • a softening temperature between 1200 ° and 1220 ° C, a spherical temperature of 1500 ° C and a hemisphere temperature of greater than 1700 ° C could be determined.
  • the products are characterized by the fact that they contain no free carbon and have flow temperatures of over 1700 ° C.
  • the covering powder according to the invention can be used at least partially.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

L'invention concerne un élément de recouvrement de base pour surfaces de bain de fusion, destiné à rendre une matière en fusion, notamment de l'acier liquide, étanche vis-à-vis d'agressions atmosphériques. Afin de réduire la formation de poussière, le matériau de base est appliqué sous forme d'enveloppe sur le matériau support inerte, tel que des billes de verre soufflées. Pour produire l'élément de recouvrement de base, il est prévu d'ajouter progressivement le matériau de base, dans des quantités inférieures au poids des billes de matériau support utilisées. Le poids total retenu du matériau de base utilisé est supérieur au triple, de préférence au quadruple jusqu'au quintuple du poids du matériau support introduit.
PCT/AT2000/000080 1999-04-14 2000-04-05 Element de recouvrement de base pour surfaces de bain de fusion et procede permettant de le produire Ceased WO2000061319A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0066599A AT407058B (de) 1999-04-14 1999-04-14 Basisches abdeckmittel für schmelzbadoberflächen sowie verfahren zu seiner herstellung
ATA665/99 1999-04-14

Publications (1)

Publication Number Publication Date
WO2000061319A1 true WO2000061319A1 (fr) 2000-10-19

Family

ID=3496595

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT2000/000080 Ceased WO2000061319A1 (fr) 1999-04-14 2000-04-05 Element de recouvrement de base pour surfaces de bain de fusion et procede permettant de le produire

Country Status (2)

Country Link
AT (1) AT407058B (fr)
WO (1) WO2000061319A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005115660A1 (fr) * 2004-05-19 2005-12-08 Metakon Gmbh Procede pour traiter un bain de metal en fusion
WO2006058347A3 (fr) * 2004-11-25 2006-08-03 Alistair Allardyce Elrick Bille resistant a la chaleur
DE102016104391A1 (de) * 2015-03-12 2016-09-15 Aalener Gesellschaft für Leichtbauteile mbH Abdeckmittel für eine Metallschmelze
CN116987841A (zh) * 2023-09-28 2023-11-03 吕梁建龙实业有限公司 用于优质碳素结构钢生产的中包覆盖剂及其制备方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102794419B (zh) * 2012-08-08 2014-02-12 江苏大学 一种无氟无钠的钢包覆盖剂
CN103551536B (zh) * 2013-10-17 2016-05-25 河南通宇冶材集团有限公司 一种中间包用喷雾造粒覆盖剂及其生产方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU32321A1 (fr) *
DE3823410C1 (en) * 1988-07-10 1989-05-24 H. Kramer Gmbh & Co Kg, 4000 Duesseldorf, De Thermally insulating covering composition for metal melts and process for producing the composition
JPH01237049A (ja) * 1988-03-17 1989-09-21 Shin Nippon Kagaku Kogyo Co Ltd 溶融金属用断熱耐火粒子
SE463499B (sv) * 1987-10-07 1990-12-03 Ssab Svenskt Stal Ab Taeckmedel foer en metallsmaelta
DE4230161A1 (de) * 1992-09-09 1994-03-10 Veitsch Radex Ag Trockene basische Abdeckmasse für metallurgische Schmelzen
DE19728368C1 (de) * 1997-07-03 1999-03-04 Georg Heller Isolierende Abdeckmittel für Stahl

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU32321A1 (fr) *
SE463499B (sv) * 1987-10-07 1990-12-03 Ssab Svenskt Stal Ab Taeckmedel foer en metallsmaelta
JPH01237049A (ja) * 1988-03-17 1989-09-21 Shin Nippon Kagaku Kogyo Co Ltd 溶融金属用断熱耐火粒子
DE3823410C1 (en) * 1988-07-10 1989-05-24 H. Kramer Gmbh & Co Kg, 4000 Duesseldorf, De Thermally insulating covering composition for metal melts and process for producing the composition
DE4230161A1 (de) * 1992-09-09 1994-03-10 Veitsch Radex Ag Trockene basische Abdeckmasse für metallurgische Schmelzen
DE19728368C1 (de) * 1997-07-03 1999-03-04 Georg Heller Isolierende Abdeckmittel für Stahl

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 198931, Derwent World Patents Index; AN 1989-225836, "Cover medium for applying to open metal smelt" *
PATENT ABSTRACTS OF JAPAN vol. 013, no. 565 (M - 907) 14 December 1989 (1989-12-14) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005115660A1 (fr) * 2004-05-19 2005-12-08 Metakon Gmbh Procede pour traiter un bain de metal en fusion
WO2005115661A1 (fr) * 2004-05-19 2005-12-08 Metakon Gmbh Procede pour usiner du metal en fusion
US7704336B2 (en) 2004-05-19 2010-04-27 Metakon Gmbh Method for treating molten metal
KR101196476B1 (ko) 2004-05-19 2012-11-01 메타콘 게엠베하 용융 금속의 처리 방법
WO2006058347A3 (fr) * 2004-11-25 2006-08-03 Alistair Allardyce Elrick Bille resistant a la chaleur
DE102016104391A1 (de) * 2015-03-12 2016-09-15 Aalener Gesellschaft für Leichtbauteile mbH Abdeckmittel für eine Metallschmelze
CN116987841A (zh) * 2023-09-28 2023-11-03 吕梁建龙实业有限公司 用于优质碳素结构钢生产的中包覆盖剂及其制备方法

Also Published As

Publication number Publication date
AT407058B (de) 2000-12-27
ATA66599A (de) 2000-04-15

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