EP1602425B1 - Poudre de couverture pour la coulée continue de métaux et sa méthode d'élaboration - Google Patents

Poudre de couverture pour la coulée continue de métaux et sa méthode d'élaboration Download PDF

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Publication number
EP1602425B1
EP1602425B1 EP05011589A EP05011589A EP1602425B1 EP 1602425 B1 EP1602425 B1 EP 1602425B1 EP 05011589 A EP05011589 A EP 05011589A EP 05011589 A EP05011589 A EP 05011589A EP 1602425 B1 EP1602425 B1 EP 1602425B1
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EP
European Patent Office
Prior art keywords
silicon dioxide
granulated materials
water
granules
dioxide powder
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.)
Not-in-force
Application number
EP05011589A
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German (de)
English (en)
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EP1602425A1 (fr
Inventor
Stefanie Heller
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Individual
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Individual
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Classifications

    • 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

Definitions

  • the present invention relates to insulating granules which are suitable as insulating and / or separating agents for high-temperature applications, and to their production.
  • the granules are to be used in different particle sizes and are produced by spray or pelletizing pelletizing with sometimes considerable technical effort.
  • a low carbon content is required in addition to the temperature and transport stability, since the carbon content in the additive changes the properties of iron and steel in an undesirable manner.
  • a constant volume of the aggregate over the entire temperature range is desirable in foundry technology, since a change in volume of the fillers and release agents used leads to an unwanted change in the casting geometry.
  • the sound-insulating properties are of outstanding importance.
  • amorphous silica powder can be processed with the addition of water to give granules which have the desired properties.
  • the object of the present invention is therefore achieved by isolating granules which are obtainable from an amorphous silica powder by pelleting with the addition of water in a ratio of solids: water of 1: 0.25 to 1: 1.5.
  • the granules according to the invention offer the advantage of good environmental compatibility in the case of production-controllable grain size or bulk density.
  • an automated task is possible. Experiments have shown that a temperature stability up to 1600 ° C is guaranteed.
  • the granules behave inert in terms of reaction and thus offer the certainty that they do not react as inserted filling material with the substances to be processed.
  • Suitable SiO 2 suppliers are all silicon powders which contain high proportions of amorphous SiO 2 or silica. Particularly suitable are microsilica, silica filter dust and mixtures of microsilica or silica filter dust and rice husk ash in different proportions by weight. The addition of further additives for defined bulk density or particle size control is possible. The composition of the starting materials and the mixing ratio of the components involved allows the control of the grain size. At the same time, these parameters also influence the carbon content that is important for the iron and foundry industry.
  • the silicon dioxide used is preferably silica filter dust, which is obtained without carbon in the silicon or silicon-producing industry and has a consistently high SiO 2 content of at least 90%. Particularly preferred is a filter dust is used, which is obtained from the flue gas scrubbing the residue combustion in the silicone production. It is irrelevant whether the silicon powder is already in the dried state or in wet chunk form as a filter cake. The silicon dioxide can be used without further drying in the form of the resulting filter cake. The already existing moisture is often enough to cause a direct granulation by stirring.
  • pretreat a caked filter cake by digestion for example by comminution / milling / sieving, in particular by pressing the puffy SiO 2 through a perforated screen, so that an open-pored structure important for granulation is obtained.
  • the granulation must be carried out from a defined moisture, which may be based on the used SiO 2 at a water content of up to 150% based on the total mass.
  • Useful water contents are 25 to 150%; Typically, proportions of 30 to 80%, in particular 30 to 70% are particularly suitable.
  • This slightly empirically determined moisture content must be met quite accurately for a given presented mixture, since too little water does not give rise to granules, only local lumps form in the powder. Further addition of water causes the granules to germinate and grow more and more. This happens until, in a moist granulation equilibrium, the added water combines to form an earth-entrained mass with the germs.
  • the granulation equilibrium is again shifted to an unfavorable range: the granules lose their structure and, depending on the amount of water, a viscous to light-bodied pasty pulp, which can be moved back into the granulation only by re-addition of solids.
  • the stirring time the granules can be further increased, which, if necessary, reach their final spherical shape after transfer into the granulating. If the quality of the resulting granules in the stirrer is already sufficient, pelletizing in the plate can be dispensed with.
  • the components used in a targeted manner by pasting with water to form granules are used in a targeted manner by pasting with water to form granules.
  • the silicon dioxide and optionally present additives expediently have a particle size which is below, preferably significantly below, the desired granule size.
  • a particle size of the starting materials of not more than 0.1 mm is well suited. A finer grind operated with higher technical effort remains without appreciable effect with this granule size.
  • substances which are used as thickening agents in food chemistry are used as additives.
  • these are first prepared in a low-percentage solution in order to influence the size of the granules after already done ate Trent of the components to be used with water and an incipient granulation.
  • the addition of dilute thickening agent solution allows the granules to be enlarged as required so that, depending on the area of application, granules of up to several centimeters in diameter can be produced in a targeted manner. Due to the agglomerating property of the additive at the same time an increase in the bulk density is observed, which in turn depends on the used and percentage composition of the SiO 2 component (s) is. It should be noted that this addition is not required for granule formation.
  • High-melting oxides or carbonates of the alkali and alkaline earth metals can also be used as additives.
  • the pH of the granules produced changes, and the formation of eutectics lowers the melting point of the mixtures in comparison to pure SiO 2 .
  • To control the pH it is also possible, if this is not to be achieved by adding an additive, to influence the silicic acid to be used in the aftertreatment by aqueous solutions of acidic or basic precipitation additions so that the granule preparation is already preceded by a filter dust with a defined pH Value takes place.
  • the effects of the precipitants used in filter dust precipitation which lead to accelerated formation of solids, must be taken into account.
  • the granules according to the invention are preferably prepared from silicon dioxide powder with the addition of water and optionally additives in a stirrer. As far as e.g. for optimal flow behavior as uniform as possible spherical shape is desired, followed by further processing in a pelletizing.
  • a SiO 2 for example, a silica filter slurry is introduced. This can be immediately pasted while stirring with water; Alternatively, rice husk ash in variable proportions can be added to the filter slurry before the addition of water, which is then mixed with water in the next step as a homogeneous mixture.
  • the already formed granules can be treated with the described additives; also by adding Reisschalenasche a granule enlargement is possible. Since the granules already formed during stirring, a subsequent treatment of the same in the granulating is not absolutely necessary, but leads to a regular spherical shape, which is desirable for certain applications.
  • the increase in size can be terminated by spraying with rice husk ash or filter dust, wherein it has been shown that the rice husk ash is particularly well suited for this process.
  • a rice husk ash addition of about 0.5% based on the total mixture is sufficient. It produces dull black granules with a size of 0.5 - 5mm, depending on the stirring time and Reisschalenaschezugabe.
  • Spraying the granules formed with weakly concentrated thickener liquid as an additive further increases the size, so that the granules can be built up to spheres with a diameter of several centimeters.
  • black-gloss granules are produced, which can be powdered again using filler or rice husk ash.
  • the process of enlarging the resulting granules can be carried out in the same way in the granulating; the granules differ only in the rounder form.
  • An alternative in the granulator is a final spraying of the granules with water, which softens the surface of the granules and leads to a perfect spherical shape due to the rotation in the plate.
  • the rice husk ash can be added as required in any weight ratios; In practice, shares of up to 30% ash have led to a good result. At the same time, however, the addition of the rice husk ash increases the bulk density.
  • pH neutrality of the granules which are at pH 8.
  • An aggregate should be pH-neutral as changes in pH may have a negative impact on the substance being processed or the forms in which the substance is processed and transported.
  • the granule size can also be influenced by the residence time in the stirrer or later in the pelletizing plate. In both cases, an extension leads to an enlargement of the granules, whereby the evaporation of the water at the granule surface dries them increasingly and the granulation comes to a standstill. An enlargement of the granules is only possible as long as the outside of the granules has a residual moisture, which allows by their pasty surface, an addition of further material.
  • the previously used powdered materials have the disadvantage of lack of flow properties and are therefore less favorable to handle and dosage. Especially the production of granules with a defined grain size leads to a possibility of customer and application-specific adaptation for the particular application.
  • the granules according to the invention have a bulk density of 0.2 to 0.7 kg / l, e.g. of 0.5 kg / l and thus meet the demand for a lightweight granules with a low bulk density.
  • the finished product can be transported and deposited in sacks or BigBags of different sizes, in troughs or silos.
  • microsilica (Elcem, Norway) having the following composition: SiO 2 : 91.1%, Fe 2 O 3 : 2.5%, Al 2 O 3 : 0.9%, MgO: 1.1%, K 2 O. : 1.7%, Na 2 O: 0.4%, SO 3 : 0.4%, residual moisture 0.5% and total carbon content. 1.65% was mixed with 30 g of water. The mass was thoroughly mixed in the stirrer, it formed granule nuclei, which increased in size with lasting stirring time. To achieve a smooth surface, the granules were powdered with 5g rice husk ash. The granules had a particle size of 0.5-3 mm and a bulk density of 0.6 kg / l.
  • the conglomerate is fed to a granulating and dried in a belt dryer.
  • the pellets in the plate can be influenced in size. Screening in the dryer returns dust and large chunks to the Eirich mixer.
  • the pellets had a bulk density of 0.5 kg / l and a softening temperature of 1,600 ° C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Silicon Compounds (AREA)
  • Processing Of Solid Wastes (AREA)
  • Glanulating (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Continuous Casting (AREA)

Claims (12)

  1. Granulats présentant une densité apparente de 0,2 à 0,7 kg/l comme agent d'isolation ou de séparation pour des applications à haute température constitués par une poudre de dioxyde de silicium, des additifs pouvant être contenus, choisis parmi les oxydes à haut point de fusion pour la modification du pH et/ou du point de fusion des granulats et des épaississants pour le contrôle de la grosseur, caractérisés en ce que les granulats sont obtenus à partir de poudre de dioxyde de silicium amorphe présentant une teneur d'au moins 90% de SiO2, choisie parmi les microsilices, la poussière de filtre de dioxyde de silicium ainsi que les mélanges de microsilice et/ou de poussière de filtre de dioxyde de silicium avec des cendres de balles de riz par granulation avec addition d'eau et séchage consécutif.
  2. Granulats selon la revendication 1, caractérisés en ce que les granulats peuvent être obtenus par pelletisation.
  3. Granulats selon la revendication 1 ou 2, caractérisés en ce que de la poussière de filtre de dioxyde de silicium y est contenue comme poudre de dioxyde de silicium.
  4. Granulats selon la revendication 1 ou 2, caractérisés en ce que des mélanges de poussière de filtre de dioxyde de silicium avec des cendres de balles de riz y sont contenus en différentes proportions en poids comme poudre de dioxyde de silicium.
  5. Granulats selon l'une quelconque des revendications 1 à 4,
    caractérisés en ce que des additifs y sont contenus pour le réglage de la densité apparente ou de la grosseur des grains.
  6. Granulats selon l'une quelconque des revendications 1 à 5,
    caractérisés en ce que la proportion totale de carbone est inférieure à 2%.
  7. Granulats selon l'une quelconque des revendications 1 à 6,
    caractérisés en ce que la grosseur des grains est située dans la plage de 0,5-5 mm.
  8. Procédé pour la préparation de granulats présentant une densité apparente de 0,2 à 0,7 kg/l comme agent d'isolation ou de séparation pour des utilisations à haute température, où
    a) de la poudre de dioxyde de silicium, choisie parmi la microsilice, la poudre de filtre d'oxyde de silice ainsi que les mélanges de microsilice ou de poussière de filtre de dioxyde de silicium avec des cendres de balles de riz, le cas échéant en ajoutant des épaississants comme additifs pour le contrôle de la grosseur et/ou en ajoutant des oxydes à point de fusion élevé comme additif pour la modification du pH et/ou du point de fusion des granulats, est gâchée/sont gâchés par de l'eau dans un rapport solide:eau de 1:0,25 à 1:1,5,
    b) la masse est granulée de manière connue en soi et
    c) les granulats sont séchés
    caractérisé en ce que la poudre de dioxyde de silicium contient au moins 90% de SiO2 amorphe.
  9. Procédé selon la revendication 8, caractérisé en ce que la masse est pelletisée.
  10. Procédé selon la revendication 9, caractérisé en ce que la grosseur de grain des granulats est réglée à 0,5-5 mm via le temps de séjour et/ou la pente et/ou la vitesse de rotation lors de la pelletisation.
  11. Procédé selon l'une quelconque des revendications 8 à 10,
    caractérisé en ce que la grosseur des grains est contrôlée via la quantité d'eau et/ou la composition de la poudre de dioxyde de silicium.
  12. Procédé selon l'une quelconque des revendications 8 à 11,
    caractérisé en ce que la densité apparente est contrôlée via la quantité d'eau et/ou la composition de la poudre de dioxyde de silicium.
EP05011589A 2004-05-29 2005-05-30 Poudre de couverture pour la coulée continue de métaux et sa méthode d'élaboration Not-in-force EP1602425B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004026443A DE102004026443B3 (de) 2004-05-29 2004-05-29 Isolierende Granulate für Anwendungen im Hochtemperaturbereich
DE102004026443 2004-05-29

Publications (2)

Publication Number Publication Date
EP1602425A1 EP1602425A1 (fr) 2005-12-07
EP1602425B1 true EP1602425B1 (fr) 2009-08-05

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EP05011589A Not-in-force EP1602425B1 (fr) 2004-05-29 2005-05-30 Poudre de couverture pour la coulée continue de métaux et sa méthode d'élaboration

Country Status (4)

Country Link
EP (1) EP1602425B1 (fr)
AT (1) ATE438471T1 (fr)
DE (2) DE102004026443B3 (fr)
ES (1) ES2331522T3 (fr)

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DE102013000527A1 (de) 2013-01-15 2014-07-17 Hans-Peter Noack Verfahren zur Abdeckung einer Metallschmelze und Abdeckmaterial

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AT504328B8 (de) * 2007-05-22 2008-09-15 Kdm Engineering Gmbh Verwendung eines zusatzstoffes für einen baustoff und verfahren zur herstellung eines baustoffes
WO2012087091A1 (fr) * 2010-12-21 2012-06-28 Hanhausen Mariscal Juan Luis Procédé de production d'une fibre isolante, thermique et organique et produit ainsi obtenu
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US8944541B2 (en) 2012-04-02 2015-02-03 Whirlpool Corporation Vacuum panel cabinet structure for a refrigerator
US9689604B2 (en) 2014-02-24 2017-06-27 Whirlpool Corporation Multi-section core vacuum insulation panels with hybrid barrier film envelope
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US9476633B2 (en) 2015-03-02 2016-10-25 Whirlpool Corporation 3D vacuum panel and a folding approach to create the 3D vacuum panel from a 2D vacuum panel of non-uniform thickness
US10161669B2 (en) 2015-03-05 2018-12-25 Whirlpool Corporation Attachment arrangement for vacuum insulated door
US9897370B2 (en) 2015-03-11 2018-02-20 Whirlpool Corporation Self-contained pantry box system for insertion into an appliance
US9441779B1 (en) 2015-07-01 2016-09-13 Whirlpool Corporation Split hybrid insulation structure for an appliance
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US10422573B2 (en) 2015-12-08 2019-09-24 Whirlpool Corporation Insulation structure for an appliance having a uniformly mixed multi-component insulation material, and a method for even distribution of material combinations therein
US10429125B2 (en) 2015-12-08 2019-10-01 Whirlpool Corporation Insulation structure for an appliance having a uniformly mixed multi-component insulation material, and a method for even distribution of material combinations therein
US10222116B2 (en) 2015-12-08 2019-03-05 Whirlpool Corporation Method and apparatus for forming a vacuum insulated structure for an appliance having a pressing mechanism incorporated within an insulation delivery system
US10808987B2 (en) 2015-12-09 2020-10-20 Whirlpool Corporation Vacuum insulation structures with multiple insulators
US11994336B2 (en) 2015-12-09 2024-05-28 Whirlpool Corporation Vacuum insulated structure with thermal bridge breaker with heat loop
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US9840042B2 (en) 2015-12-22 2017-12-12 Whirlpool Corporation Adhesively secured vacuum insulated panels for refrigerators
US10018406B2 (en) 2015-12-28 2018-07-10 Whirlpool Corporation Multi-layer gas barrier materials for vacuum insulated structure
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US11247369B2 (en) 2015-12-30 2022-02-15 Whirlpool Corporation Method of fabricating 3D vacuum insulated refrigerator structure having core material
US10712080B2 (en) 2016-04-15 2020-07-14 Whirlpool Corporation Vacuum insulated refrigerator cabinet
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DE102016112042B4 (de) * 2016-06-30 2019-10-02 Refratechnik Holding Gmbh Wärmedämmender, feuerfester Formkörper, insbesondere Platte, und Verfahren zu dessen Herstellung und dessen Verwendung
WO2018022007A1 (fr) 2016-07-26 2018-02-01 Whirlpool Corporation Coupe-garniture à structure isolée sous vide
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Publication number Priority date Publication date Assignee Title
DE102013000527A1 (de) 2013-01-15 2014-07-17 Hans-Peter Noack Verfahren zur Abdeckung einer Metallschmelze und Abdeckmaterial
WO2014111334A2 (fr) 2013-01-15 2014-07-24 Hans-Peter Noack Procédé pour former une couverture sur un métal en fusion et matière de couverture
DE202014011135U1 (de) 2013-01-15 2018-01-25 Hans-Peter Noack Granulat zur Abdeckung einer Metallschmelze

Also Published As

Publication number Publication date
DE502005007824D1 (de) 2009-09-17
EP1602425A1 (fr) 2005-12-07
DE102004026443B3 (de) 2006-02-02
ATE438471T1 (de) 2009-08-15
ES2331522T3 (es) 2010-01-07

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