EP1058077A2 - Composition réfractaire, en particulier pour la fabrication d'une pièce moulée et procédé de fabrication de la pièce moulée - Google Patents

Composition réfractaire, en particulier pour la fabrication d'une pièce moulée et procédé de fabrication de la pièce moulée Download PDF

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Publication number
EP1058077A2
EP1058077A2 EP00111666A EP00111666A EP1058077A2 EP 1058077 A2 EP1058077 A2 EP 1058077A2 EP 00111666 A EP00111666 A EP 00111666A EP 00111666 A EP00111666 A EP 00111666A EP 1058077 A2 EP1058077 A2 EP 1058077A2
Authority
EP
European Patent Office
Prior art keywords
offset according
metal oxide
offset
refractory metal
fibers
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Withdrawn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
EP00111666A
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German (de)
English (en)
Inventor
Hans Wienand
Helge Dr. Jansen
Peter Dr. Bartha
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.)
Refratechnik Holding GmbH
Original Assignee
Refratechnik Holding 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 Refratechnik Holding GmbH filed Critical Refratechnik Holding GmbH
Publication of EP1058077A2 publication Critical patent/EP1058077A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
    • F27D1/06—Composite bricks or blocks, e.g. panels, modules
    • F27D1/08—Bricks or blocks with internal reinforcement or metal backing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics

Definitions

  • the invention relates to an offset, in particular for production a refractory molded body according to the preamble of the claim 1, a refractory molded body according to the preamble of Claim 29 and a method for producing the molded body according to the preamble of claim 31.
  • reaction and transport containers lined with refractory materials or lined with so-called ramming compounds are in particular converters such as inflating or bottom-blowing Converters in which crude steel is extracted from pig iron. Furthermore, so-called steel ladles and treatment ladles for secondary metallurgical processes (steel finishing) but also Subsequent units of the continuous casting system are fireproof accordingly lined.
  • steel ladles can be both alumina-rich be lined up as well as a basic delivery Based on MgO or dolomite.
  • This carbon carrier can be in the form of any resin Kind, tar or pitch or graphite or mixtures of these components consist.
  • the tasks of carbon carriers are complex.
  • the carbon essentially has the function of slagging Minimize moldings by allowing the wettability of the surface reduced and also closes open pores.
  • a wear mechanism is that more or less thin of Slag infiltrated superficial layers of the molded body wear through dissolution and abrasion or flaking. Man speaks of thermochemical wear.
  • thermomechanical wear is known, which is caused by Chipping of unchanged stone areas due to too large thermomechanical stresses takes place.
  • Carbon-containing moldings also wear through Decarburization of the fire-side layers.
  • Moldings based on MgO are generally characterized by high Fire resistance and very good resistance to slags, especially against high basicity slags, i.e. she have great advantages over thermochemical stress.
  • a disadvantage especially with regard to the temperature change behavior, is the relatively high coefficient of thermal expansion of the MgO and its high modulus of elasticity. Further MgO has a relatively high heat conduction.
  • refractory moldings or refractory offsets which a high proportion of a carbon carrier as a "slag brake" have, in particular, pitch-bound moldings, in particular known based on magnesia.
  • This magnesia or too Dolomite stones can be made with tar or pitch binding.
  • pitch-containing binders these coarse-grained magnesia sinter mixtures already in the silo approx. 100 ° C and higher preheated and in heated mixers Bad luck and possibly carbon additives as well crosslinking substances mixed hot. After pressing the Shaped bodies are heat treated in an annealing furnace at approx. 300 ° C.
  • Annealing increases the strength of the stones increases and the chipping sensitivity by the outlet slightly volatile hydrocarbons, especially in the heating phase of the Converter, noticeably reduced.
  • this makes molded articles with a resin bond and graphite made that the components mixed cold, under high Press pressure formed and then hardened at approx. 200 ° C become.
  • the hardening mechanisms depend among other things on it whether a one-component resin (resol resin) or a two-component resin with hardener (novolak resins) is used.
  • the resin content is usually between 2 and 5%
  • the proportion of graphite can be between approx. 7 and 20%, whereby around 15% can be regarded as common.
  • carbonaceous Stones can also have antioxidants, in particular in the form of metals such as Al, Mg or Si.
  • the steel reinforcement elements melt during use on. Investigations on the steel elements Shaped bodies after use have shown that the steel wires are completely melted and the melt in the stone structure, especially along the grain boundaries and in the gussets is finely distributed so that the steel wires are already there after a short time Duration of use as connected elements can no longer be localized are. Such steel wire elements or fibers - if they can be processed in stone at all - only to a possibly improved strength in the green state of the stone. Once the molded body has a certain Temperature threshold has exceeded, or in use a positive effect of the steel fibers is no longer detectable.
  • the object of the invention is a refractory, reinforcements containing offset, especially for the production of moldings to create a high green strength of the molded body, an improved wear resistance, especially at Impact, impact or shock loads as well as an increased resistance to temperature changes having.
  • the refractory offset or the refractory Material at least one refractory metal oxide component, a binder component such as resin or pitch, optionally antioxidants, especially metallic antioxidants, a carbon carrier such as carbon black and / or graphite and reinforcing fibers which are made of a stainless steel material which a casing made of the refractory metal oxide at operating temperatures trains.
  • a binder component such as resin or pitch
  • antioxidants especially metallic antioxidants
  • a carbon carrier such as carbon black and / or graphite and reinforcing fibers which are made of a stainless steel material which a casing made of the refractory metal oxide at operating temperatures trains.
  • a reinforcing body was selected, which deal with the other components of the offset without problems especially without the formation of nests, layers or others Can mix inhomogeneities and also good when mixing is connected to the other components. Furthermore, for the Manufacture of moldings the material for the reinforcement selected to have ductility or ductility has such that when pressing the offset to form bodies no appreciable pressing or deformation energy due to this reinforcement body is stored so that elasticity in that that the elements have their original shape due to Want to accept restoring forces again, does not occur. The reinforcement elements are thus created in the pressing Molded structure pressed in without this apart to drive.
  • the material forming the reinforcement body during heating the offset in particular as a shaped body forms a scale layer on the surface, i.e. that it's too a superficial oxidation of the material occurs without this oxidation progresses too far into the interior of the material and so the element is destroyed by further oxidation.
  • the material was also selected in such a way that a conversion to the liquid phase as slowly as possible and first takes place at the highest possible temperatures, so that the fiber is possible remains inherently stable for a long time.
  • this a thin scaled surface of the reinforcement material or a hem made of the refractory oxidic material forms this hem is formed in such a way that a fireproof envelope surrounding the reinforcing element becomes.
  • the invention is also exemplified on the basis of a Figure and explained using exemplary embodiments, wherein the illustration shows the cross section through a partial area shows the shaped body formed according to the invention, in which a reinforcing element used in the invention Cross section can be seen.
  • the refractory backing of the invention comprises a refractory metal oxide.
  • This metal oxide can in particular be Al 2 O 3 (alumina), MgO (periclase) or dolomite.
  • These raw materials are present with the usual and known impurities.
  • the raw materials are classified according to a desired grain distribution and thus a desired grain band is achieved by systematically combining the classes.
  • the grain width ranges in particular from 0 to 10, a typical grain distribution can be 0 to 6.
  • the content of the refractory metal oxide in the offset can be between 70 M% and 100 M%.
  • Magnesium oxide is used as the refractory metal oxide preferably a magnesium oxide with low iron oxide, silicate and boron content with a high sintering density and as large as possible Periclase crystals are used, the MgO content being 97% or lies above.
  • the batch according to the invention further comprises a binder component.
  • the binder component can be used as a one-component synthetic resin (resol resin) or designed as a two-component synthetic resin (novolak resin) his.
  • a pitch bond can also be sought be pitch and a hardener as a binder component (Nitrate, sulfur) is used.
  • a hardener as a binder component (Nitrate, sulfur) is used.
  • the offset according to the invention further comprises a carbon carrier in particular in the form of carbon black and / or graphite, the Carbon carrier content in the total offset between 0% and 30% by mass, in particular between 11 to 15% by mass.
  • the offset can also have antioxidants, especially metallic antioxidants such as silicon, aluminum or magnesium in amounts of 0% up to 10% included.
  • the total carbon content after coking is between 0% and 30%.
  • melt-spun stainless steel fiber elements For use in the offset according to the invention are special selected, melt-spun stainless steel fiber elements.
  • melt-spun steel fibers are used which according to the melt extract (ME) process or according to the melt overflow (MO) process getting produced.
  • ME melt extract
  • MO melt overflow
  • MO fibers can be significant are produced thinner than ME fibers, using the MO process
  • the fibers obtained are long fibers, which are used, for example, for fabrics can be used.
  • the MO fibers have a crescent shape Cross section on. According to the invention it was found that fibers produced by the MO process are well suited, if they are shorter than the commonly produced MO fibers.
  • the fibers used have a diameter of 5 to 250 ⁇ m with a length of 4 to 100 mm.
  • chromium steel is used as the material forming the fiber, e.g. the classification of chrome-nickel steel 430 and / or Chrome-nickel steel, e.g. the classification of chrome-nickel steel 310 used.
  • the offset has up to 3 M% (MO) fibers or up 5 M% (ME) fibers, with mixtures of both types of fibers may be included in the offset.
  • the grain belt is made up of several Grain fractions composed.
  • this flour, fine and fine grain fraction for example with a grain size of 0 to 100 ⁇ m are initially the fibers or the reinforcement elements gradually mixed in a mixer until the desired amount of reinforcing elements is included. Subsequently, until homogeneous further mixed and then the dry carbon carrier such as graphite or carbon black. It then becomes this Premix the remaining, coarser part of the refractory Metal oxide gradually mixed in, the total mass of the refractory Metal oxide mixed homogeneously with the fibers and the graphite is. It is also possible to pre-mix the already in a remaining grain band of the refractory metal oxides located in a mixer admitted.
  • Shaped bodies are to be achieved with a resin bond then added the resin to the cold mixer and until mixed to homogeneity. If a resin-hardener mixture is used, the resin is premixed with the hardener and added together or first only the resin and then the hardener and mixed to homogeneity. It is also possible the mixture of the refractory metal oxide, the reinforcement elements and the carbon for mixing with the resin or binder a separate dedicated mixer give up to mix there with the resin.
  • the offset also contains antioxidants if desired as well as other common components such as pressing aids, if this is needed.
  • the finished batch mixture is fed to the presses customary in the refractory industry, where it is pressed into shaped bodies. For example with a pressure of 180 N / mm 2 .
  • the finished resin-bound moldings are then the hardening step at temperatures usual for this technology subjected to between 120 ° C and 200 ° C.
  • a pitch bond of the offset according to the invention is to be achieved the process steps up to the finished mixture the fixed components, including any necessary auxiliary components such as antioxidants and other known minor ingredients carried out and then this premix in given a heated mixer where this mixture mixed with pitch and is homogenized.
  • this mixture mixed with pitch and is homogenized.
  • the homogenization of the Pitch or the crosslinkers for the bad luck are added, especially sulfur and / or nitrate.
  • the moldings obtained are pressed in a tempering step subjected at 200 ° C to 300 ° C, the pitch with the help of Crosslinking agent is crosslinked.
  • An MgO sinter is classified. To the flour, very fine and fine grain fraction ( ⁇ 10 to 20 M%) which are placed in a mixer fibers are obtained using the melt overflow process made of a chrome steel with a diameter of 100 ⁇ m and one Length of 6 mm in an amount of 1% based on the total mass added. After homogenization, 10% become one Flake graphite metered in and homogenization achieved. Out the other fractions of the classified MgO sinter become one Grain composition or a grain band with a typical grain distribution curve for magnesia carbon stones in a mixer mixed together. To this rough portion of the refractory metal oxide the fine fraction is now together with the fibers and mixed with the graphite.
  • An MgO sinter is classified as in Example 1.
  • very fine and fine grain fraction (approx. 10 to 20 M%)
  • the placed in a mixer are made using the melt overflow process fibers obtained from a chrome steel (e.g. the classification Chrome steel 430) with a diameter of 100 ⁇ m and a length of 20 mm in an amount of 1% by mass based on the Total mass added.
  • 5% become one Graphite metered in and homogenization achieved.
  • From the other fractions of the classified MgO sinter are as with Embodiment 1 a grain composition or a grain belt with a typical grain distribution curve for magnesia carbon stones mixed together in a mixer.
  • the others Method steps correspond to the method steps of the exemplary embodiment 1.
  • refractory offset according to the invention in particular Manufacture of moldings is advantageous because of the special selection of steel reinforcement elements for the first time extraordinarily good processability of refractory raw material, Carbon beams and reinforcement elements achieved in one mass is, with the reinforcement elements a change in shape after pressing through the elastic storage of deformation forces is achieved. In addition, an education of inhomogeneities during mixing and of layer formation prevented during pressing. It is also advantageous that it through the special selection of the reinforcement elements Materials have succeeded in making these elements a ceramic Form envelope around, so that the reinforcing elements their original Maintain shape even in the high temperature range.
  • a refractory offset is therefore particularly achieved for the production of moldings, which the production of moldings allowed, which improved wear resistance especially against impact, impact, impact, and thermomechanical and have mechanical stresses.
  • the illustrated Advantages can also be achieved if the refractory offset according to the invention for injection or ramming compounds as well as mortar is used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP00111666A 1999-06-04 2000-05-31 Composition réfractaire, en particulier pour la fabrication d'une pièce moulée et procédé de fabrication de la pièce moulée Withdrawn EP1058077A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19925591A DE19925591C2 (de) 1999-06-04 1999-06-04 Feuerfester Versatz, Formkörper hieraus und Verfahren zur Herstellung des Formkörpers
DE19925591 1999-06-04

Publications (1)

Publication Number Publication Date
EP1058077A2 true EP1058077A2 (fr) 2000-12-06

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ID=7910229

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Application Number Title Priority Date Filing Date
EP00111666A Withdrawn EP1058077A2 (fr) 1999-06-04 2000-05-31 Composition réfractaire, en particulier pour la fabrication d'une pièce moulée et procédé de fabrication de la pièce moulée

Country Status (6)

Country Link
US (1) US6645425B1 (fr)
EP (1) EP1058077A2 (fr)
JP (1) JP4473412B2 (fr)
BR (1) BRPI0002582B8 (fr)
CA (1) CA2310431C (fr)
DE (1) DE19925591C2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004079284A1 (fr) * 2003-03-05 2004-09-16 Refratechnik Holding Gmbh Mur refractaire et pierres refractaires destinees a la fabrication d'un mur
WO2005001359A1 (fr) * 2003-06-30 2005-01-06 Refratechnik Holding Gmbh Ouvrage de maçonnerie a l'epreuve des flammes et pierres a l'epreuve des flammes destinees a cet ouvrage de maçonnerie a produire
WO2015018813A1 (fr) * 2013-08-05 2015-02-12 Calderys France Compositions réfractaires à mouler et leur utilisation dans la formation et la réparation de revêtements réfractaires monolithiques
WO2016102149A1 (fr) * 2014-12-22 2016-06-30 Refratechnik Holding Gmbh Produits réfractaires et leur utilisation
US10207955B2 (en) 2014-12-22 2019-02-19 Refratechnik Holding Gmbh Refractories and use thereof

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008014959U1 (de) * 2008-11-11 2010-04-01 Flint, Eckart Mörtelmischung
KR101109877B1 (ko) * 2010-06-28 2012-02-15 현대제철 주식회사 부정형 내화물

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
DE1039059B (de) * 1957-06-29 1958-09-18 Basf Ag Verfahren zur Herstellung von Cyclooctatetraen
US4208214A (en) * 1978-04-21 1980-06-17 General Refractories Company Refractory compositions
DE3026570C2 (de) * 1980-07-12 1984-06-28 Didier-Werke Ag, 6200 Wiesbaden Feuerfester Stein mit einem Gehalt an Stahl- oder Edelstahlfasern und Verwendung des Steins
US4366255A (en) * 1981-03-23 1982-12-28 Wahl Refractory Products, Company Highly reinforced refractory concrete with 4-20 volume % steel fibers
US5018709A (en) * 1988-08-15 1991-05-28 Cassens Jr Nicholas Making a taphole
SE9201363L (sv) * 1992-04-30 1993-11-01 Kanthal Ab Användning av fibrer eller trådar av ett metalliskt material i eldfast keramiskt material samt material innehållande sådana fibrer eller trådar
DE19643111C2 (de) * 1995-10-20 2003-04-03 Hans Wienand Verwendung von Steinen für die Stahlindustrie

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004079284A1 (fr) * 2003-03-05 2004-09-16 Refratechnik Holding Gmbh Mur refractaire et pierres refractaires destinees a la fabrication d'un mur
WO2005001359A1 (fr) * 2003-06-30 2005-01-06 Refratechnik Holding Gmbh Ouvrage de maçonnerie a l'epreuve des flammes et pierres a l'epreuve des flammes destinees a cet ouvrage de maçonnerie a produire
DE10394173B4 (de) * 2003-06-30 2017-04-13 Refratechnik Holding Gmbh Verwendung von ungebrannten, feuerfesten Steinen in einem feuerfesten Mauerwerk
WO2015018813A1 (fr) * 2013-08-05 2015-02-12 Calderys France Compositions réfractaires à mouler et leur utilisation dans la formation et la réparation de revêtements réfractaires monolithiques
EP3705463A1 (fr) * 2013-08-05 2020-09-09 Imertech Sas Compositions réfractaires coulables, leur utilisation dans la formation de garnitures réfractaires et procédés de production de ces compositions
EA036340B1 (ru) * 2013-08-05 2020-10-28 Имертеш Сас Литьевые огнеупорные составы и их использование в формировании и восстановлении монолитных огнеупорных футеровок
WO2016102149A1 (fr) * 2014-12-22 2016-06-30 Refratechnik Holding Gmbh Produits réfractaires et leur utilisation
US10207955B2 (en) 2014-12-22 2019-02-19 Refratechnik Holding Gmbh Refractories and use thereof
US10227260B2 (en) 2014-12-22 2019-03-12 Refratechnik Holding Gmbh Refractories and use thereof

Also Published As

Publication number Publication date
DE19925591A1 (de) 2000-12-07
US6645425B1 (en) 2003-11-11
DE19925591C2 (de) 2002-01-17
CA2310431A1 (fr) 2000-12-04
BR0002582A (pt) 2001-01-02
JP2001039776A (ja) 2001-02-13
CA2310431C (fr) 2006-09-05
BR0002582B1 (pt) 2013-10-29
BRPI0002582B8 (pt) 2017-03-07
JP4473412B2 (ja) 2010-06-02

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