EP1602425A1 - Isolierende Granulate für Metallstranggiessen und deren Herstellungsverfahren - Google Patents
Isolierende Granulate für Metallstranggiessen und deren Herstellungsverfahren Download PDFInfo
- Publication number
- EP1602425A1 EP1602425A1 EP05011589A EP05011589A EP1602425A1 EP 1602425 A1 EP1602425 A1 EP 1602425A1 EP 05011589 A EP05011589 A EP 05011589A EP 05011589 A EP05011589 A EP 05011589A EP 1602425 A1 EP1602425 A1 EP 1602425A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- granules
- water
- sio
- silica
- silica 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.)
- Granted
Links
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 can be used as insulating and / or release agents for high temperature applications, as well as their preparation.
- the granules are to come in different particle sizes are used and be by spraying or pelletizing pelletizing with sometimes considerable produced technical effort.
- low carbon content is required because the carbon content in the additive Property of iron and steel changed in an undesirable manner.
- the mentioned properties is a constant volume in foundry technology the aggregate over the entire temperature range desired as a Volume change of the fillers and release agents used to an unwanted Changing the mold geometry leads. In the construction sector, however, are next thermal stability the sound-insulating properties of outstanding Importance.
- amorphous silica powder can be processed with the addition of water to granules, the desired Have properties.
- the object of the present invention is therefore achieved by insulating Granules consisting of an amorphous silica powder by pelleting with the addition of water in a ratio of solid: water of 1: 0.25 to 1: 1.5 are available.
- the granules according to the invention offer the advantage of good environmental compatibility in production controllable grain size or bulk density.
- Manual material dosing is an automated task possible. Experiments have shown that a temperature stability up to 1600 ° C is guaranteed. At the same time, the granules behave inert in terms of reaction and thus offer the certainty that they are not used as a filling material react to 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 / grinding / screening, in particular by pressing the puffy SiO 2 through a perforated screen, so that an open-pored structure important for granulation is obtained.
- the dried and possibly ground filter cake by defined addition of water first in the Granulierungs Kunststoff be brought, with a crushing or grinding for Achieving the open-pore structure described is also preferred.
- 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 granules can be further increased, if necessary. reach their final spherical shape after transfer to the granulator. Is the Quality of the resulting granules in the stirrer already sufficient, can on a Pelleting in the plate can be dispensed with.
- the components used in a targeted manner cake with water to make granules.
- the silica and optionally present additives have expediently a particle size on, which is below, preferably well below, the desired granule size.
- a granule size of e.g. 0.5 mm is a particle size of the starting materials of a maximum of 0.1 mm.
- One with higher technical Effort operated finer grinding remains at this granule size without significant impact.
- 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 made 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, an increase in the bulk density is simultaneously observed, which in turn depends on the used and percentage composition of the SiO 2 component (s). 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 made of silicon dioxide powder prepared with the addition of water and optionally additives in a stirrer. As far as e.g. for an optimal flow behavior as even as possible Ball shape is desired, completes further processing in a pelletizing at.
- the granules by other agglomeration or granulation as the pelleting in a stirrer. Preferably should No or very little compressive forces are used in the granulation. Suitable are e.g. Screen granulators or vertical granulators and the Fluidized bed granulation. The well-known Kompaktierungs vide are only suitable if a slightly higher bulk density is acceptable.
- 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 are treated with the described additives; also by one Addition of rice husk ash is a granule enlargement possible. Because the Granules already formed during stirring, is a subsequent treatment the same in the granulator not necessarily necessary, but leads to a regular spherical shape, which is desirable for certain applications.
- the increase in size can be due to Powders are finished with rice husk ash or filter dust, taking has shown that the rice husk ash is particularly good for this process suitable is.
- a Reisschalenaschezugabe 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.
- the rice husk ash can be used as required in any Weight ratios are added; in practice shares have up to 30% Ashes led to a good result. At the same time, the addition of the Rice husk ash but increase the bulk density.
- pH neutrality of the Granules that are at pH 8.
- An aggregate should become pH neutral behave as changes in the pH negatively affect the processing substance or the forms in which the substance is processed and is transported, can carry.
- the present production process without combining the powders used forms a matrix with the aid of a gel-forming material.
- amorphous SiO 2 allows direct granulation.
- inclination by defined addition of water and controlling the reaction conditions by residence time and Inclination / rotational speed of the pelletizing plate can be a granulate in defined Grain size of 0.5 - 5 mm size can be produced, which is characterized by thermal and mechanical stability up to the high temperature range.
- the granule size can also be determined by the residence time in the stirrer or later in the Pelletizing be influenced. In both cases, an extension leads to an enlargement of the granules, whereby by the evaporation of the water the granules surface increasingly dries and the granulation for Standstill comes. An enlargement of the granules is only possible as long as the Outside of the granules has a residual moisture, through their pasty Surface allows attachment of additional material.
- the powdered materials used so far have the here Disadvantage of missing 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 respective 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 light granules with a low bulk density.
- the finished product can vary according to customer requirements in bags or BigBags Size, transported in troughs or silos and abandoned.
- 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)
- Continuous Casting (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
SiO2: 87%, CaO: 1 %, Al2O3: 0,2%, Na2O: 0,2%, K2O: 2%, Fe2O3: 0,15%, Cges: 6,2%, Restfeuchte 1,1 %
und 25 g Wasser gemischt. Anschließend wurde die Masse im Rührer gerührt, wobei sich nach kurzer Zeit offenporige Pellets bilden, die bei langsam drehendem Rüher anwachsen. Weiterrühren führt zu ca. 3 mm großen Verklumpungen, die die Bildung des Granulats darstellen. Weiterbehandlung im Pelletierteller führ zu glatten Pellets, die weiter wachsen. Abpudern mit SiO2 stoppt die Vergrößerung und führt zu gleichmäßiger Oberfläche und runder Struktur. Die Granulate hatten eine Korngröße von 2 - 5 mm und ein Schüttgewicht von 0,62 kg/l.
SiO2: 96,7%, CaO: 1 %, Al2O3: 0,2%, Na2O: 0,03%, K2O: 0,01 %, Fe2O3: 0,2%, Cges: 0,75%, Restfeuchte 1 %
wurden mit 40 kg Reisschalenasche mit folgender Zusammensetzung:
SiO2: 87%, CaO: 1 %, Al2O3: 0,2%, Na2O: 0,2%, K2O: 2%, Fe2O3: 0,15%, Cges: 6,2%, Restfeuchte 1,1%
und 138 kg Wasser in einem Eirich-Mischer vermischt. Über einen Dosierer und eine Förderschnecke wird das Konglomerat einem Granulierteller zugeführt und in einem Bandtrockner getrocknet. Durch Abpudern mit SiO2 bzw. Besprühen mit Wasser können die Pellets im Teller in ihrer Größe beeinflußt werden. Eine Siebung im Trockner führt Staubanteile und zu große Brocken in den Eirich-Mischer zurück. Die Pellets hatten ein Schüttgewicht 0,5 kg/l und eine Erweichungstemepratur von 1.600°C.
Claims (12)
- Granulate als Isolier- oder Trennmittel für Hochtemperaturanwendungen enthaltend Siliziumdioxid, dadurch gekennzeichnet, dass die Granulate aus amorphem Siliziumdioxidpulver mit einem Gehalt von mindestens 90% SiO2 durch Granulierung unter Zugabe von Wasser und anschließende Trocknung erhältlich sind.
- Granulate gemäß Anspruch 1, dadurch gekennzeichnet, dass die Granulate durch Pelletierung erhältlich sind.
- Granulate gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass Mikrosilika oder Siliziumdioxidfilterstaub als Siliziumdioxidpulver enthalten ist.
- Granulate gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass Mischungen aus Mikrosilika und/oder Siliziumdioxidfilterstaub mit Reisschalenasche in unterschiedlichen Gewichtsanteilen als Siliziumdioxidpulver enthalten sind.
- Granulate gemäß einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass Additive zur Einstellung von Schüttdichte bzw. Korngröße enthalten sind.
- Granulate gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Schüttgewicht im Bereich von 0,2 bis 0,7 kg/l liegt.
- Granulate gemäß einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Korngröße im Bereich von 0,5 - 5 mm liegt.
- Verfahren zur Herstellung von Granulaten als Isolier- oder Trennmittel für Hochtemperaturanwendungen, wobeia) Siliziumdioxidpulver mit Wasser in einem Verhältnis von Feststoff:Wasser von 1:0,25 bis 1:1,5 angeteigt wird,b) die Masse in an sich bekannter Weise granuliert wird undc) die Granulate getrocknet werden
- Verfahren gemäß Anspruch 8, dadurch gekennzeichnet, dass die Masse pelletiert wird.
- Verfahren gemäß Anspruch 9, dadurch gekennzeichnet, dass die Korngröße der Granulate über die Verweilzeit und/oder die Neigung und/oder die Rotationsgeschwindigkeit bei der Pelletierung auf 0,5 - 5 mm eingestellt wird.
- Verfahren gemäß einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, dass die Korngröße über die Menge an Wasser und/oder die Zusammensetzung des Siliziumdioxidpulvers gesteuert wird.
- Verfahren gemäß einem der Ansprüche 8 bis 11, dadurch gekennzeichnet, dass das Schüttgewicht über die Menge an Wasser und/oder die Zusammensetzung des Siliziumdioxidpulvers gesteuert wird.
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 true EP1602425A1 (de) | 2005-12-07 |
EP1602425B1 EP1602425B1 (de) | 2009-08-05 |
Family
ID=34982613
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05011589A Not-in-force EP1602425B1 (de) | 2004-05-29 | 2005-05-30 | Isolierende Granulate für Metallstranggiessen und deren Herstellungsverfahren |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1602425B1 (de) |
AT (1) | ATE438471T1 (de) |
DE (2) | DE102004026443B3 (de) |
ES (1) | ES2331522T3 (de) |
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AT504328B1 (de) * | 2007-05-22 | 2008-05-15 | Kdm Engineering Gmbh | Verwendung eines zusatzstoffes für einen baustoff und verfahren zur herstellung eines baustoffes |
US9835369B2 (en) | 2012-04-02 | 2017-12-05 | Whirlpool Corporation | Vacuum insulated structure tubular cabinet construction |
US9833942B2 (en) | 2012-04-11 | 2017-12-05 | Whirlpool Corporation | Method to create vacuum insulated cabinets for refrigerators |
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WO2018002098A1 (de) * | 2016-06-30 | 2018-01-04 | Refratechnik Holding Gmbh | Wärmedämmender, feuerfester formkörper, insbesondere platte, und verfahren zu dessen herstellung und dessen verwendung |
US10018406B2 (en) | 2015-12-28 | 2018-07-10 | Whirlpool Corporation | Multi-layer gas barrier materials for vacuum insulated structure |
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US10598424B2 (en) | 2016-12-02 | 2020-03-24 | Whirlpool Corporation | Hinge support assembly |
US10610985B2 (en) | 2015-12-28 | 2020-04-07 | Whirlpool Corporation | Multilayer barrier materials with PVD or plasma coating for vacuum insulated structure |
US10712080B2 (en) | 2016-04-15 | 2020-07-14 | Whirlpool Corporation | Vacuum insulated refrigerator cabinet |
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DE102019131241A1 (de) * | 2019-08-08 | 2021-02-11 | HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung | Verfahren zur Herstellung eines Artikels zur Verwendung in der Gießereiindustrie, entsprechendes Granulat sowie Kit, Vorrichtungen und Verwendungen |
US11009284B2 (en) | 2016-04-15 | 2021-05-18 | Whirlpool Corporation | Vacuum insulated refrigerator structure with three dimensional characteristics |
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WO2012087091A1 (es) * | 2010-12-21 | 2012-06-28 | Hanhausen Mariscal Juan Luis | Proceso para producir una fibra aislante, térmica y orgánica y producto resultante |
DE102013000527A1 (de) | 2013-01-15 | 2014-07-17 | Hans-Peter Noack | Verfahren zur Abdeckung einer Metallschmelze und Abdeckmaterial |
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EP0018633A2 (de) * | 1979-05-02 | 1980-11-12 | Wacker-Chemie GmbH | Giesspulver zum Stranggiessen von Stahl |
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EP0723828A1 (de) * | 1995-01-27 | 1996-07-31 | SOLLAC (Société Anonyme) | Ein Stahlstranggussform deckendes Giesspulver, insbesondere für Stahl mit sehr niedrigem Kohlenstoffgehalt |
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-
2004
- 2004-05-29 DE DE102004026443A patent/DE102004026443B3/de not_active Expired - Fee Related
-
2005
- 2005-05-30 ES ES05011589T patent/ES2331522T3/es active Active
- 2005-05-30 EP EP05011589A patent/EP1602425B1/de not_active Not-in-force
- 2005-05-30 DE DE502005007824T patent/DE502005007824D1/de active Active
- 2005-05-30 AT AT05011589T patent/ATE438471T1/de not_active IP Right Cessation
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Publication number | Publication date |
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ATE438471T1 (de) | 2009-08-15 |
EP1602425B1 (de) | 2009-08-05 |
DE502005007824D1 (de) | 2009-09-17 |
ES2331522T3 (es) | 2010-01-07 |
DE102004026443B3 (de) | 2006-02-02 |
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