EP0338024A1 - Powder for continuous casting. - Google Patents
Powder for continuous casting.Info
- Publication number
- EP0338024A1 EP0338024A1 EP19880901755 EP88901755A EP0338024A1 EP 0338024 A1 EP0338024 A1 EP 0338024A1 EP 19880901755 EP19880901755 EP 19880901755 EP 88901755 A EP88901755 A EP 88901755A EP 0338024 A1 EP0338024 A1 EP 0338024A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- granulated
- powder
- continuous casting
- powder mixture
- inorganic
- 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 invention relates to a process for the production of granulated continuous casting powder which is suitable for the continuous casting of steels of all types and which permits the use of high casting speeds.
- the aim is to be able to increase the casting speed by using improved continuous casting powder and to achieve a cost reduction by automating process sequences.
- the previously known methods for producing granulated casting powder are based on slurrying the casting powder components in water, at least 30% of water being required, whereupon this suspension is then sprayed or atomized or extruded in order to obtain a granulate which is then dried.
- this suspension is then sprayed or atomized or extruded in order to obtain a granulate which is then dried.
- open, spherical hollow bodies or closed, cylindrical full bodies are obtained.
- the shape of the granules is subject to various requirements:
- the granulate should be able to be conveyed pneumatically as well as mechanically, and the grain should not be broken. There must be no abrasion because dust can interfere with the automatic measuring and dosing devices for loading the mold with mold powder and its level control on the bath level. Farther The granulate should be well distributed on the liquid bath level in the mold so that the liquid steel is well covered.
- the granules produced by the previously known processes have disadvantages in this regard.
- the hollow spheres have insufficient mechanical strength, while the cylindrical bodies are poorly distributed on the liquid steel in the mold.
- the invention is therefore based on the object of specifying a process for producing a granulated continuous casting powder which not only satisfies the requirements for rapid melting at the interface between liquid steel and casting powder and for high thermal insulation of the applied casting powder layer, but also sufficient mechanical Has strength, in order to be able to be conveyed without breaking and, moreover, is as spherical as possible and to ensure good distribution when the powders are used.
- the granules should have a bulk density which is as low as possible, the powder mixture must not separate or change in its chemical analysis as a result of the granulation process, and the investment and energy costs for production should be low and finally, if possible, all powder mixtures should be able to be processed into granules in a single plant.
- Addition of water, an inorganic granulating agent and optionally an organic binder is granulated to spherical, full granules. Because the granulated full casting powder produced according to the invention is in spherical form, it has a high fluidity and can be distributed very well on the liquid level in the casting mold. Due to its high mechanical strength, there is no abrasion during conveying and mold loading, which means that workplace-related and ecological problems can be avoided as well as malfunctions in the automatic measuring and metering devices. It has proven to be particularly advantageous that the process according to the invention requires only small amounts of water to granulate the powder. This saves considerable amounts of energy during the subsequent drying process.
- a powder mixture based on high-melting oxides, fluxes and carbon carriers is expediently granulated in a mixer which works by a centrifugal or whirling process with the addition of inorganic granulating agent and water.
- a very low content of inorganic granulating agent of up to about 1% by weight and a very low water content of about 10 to 15% by weight are sufficient.
- a particularly suitable inorganic granulating agent is a colloidal dispersion of amorphous silicon dioxide in water, for example a 30% silica sol.
- the silicon dioxide is present in the form of single, non-crosslinked spherical particles that are hydrolyzed on the surface.
- the sol changes to the gel state, i.e. in solid amorphous, water-insoluble silicon dioxide, binding the casting powder components to a solid, full granulate.
- Water glass for example, can also be used as the inorganic granulating agent.
- the granulated, spherical continuous casting powder is dried after the granulation process, expediently in a fluid bed dryer to a residual moisture content of less than 1% by weight, with an inlet air temperature - ii -
- the continuous casting powder is expediently granulated to a grain size of approximately 200 ⁇ m to above 1 ⁇ m, different grain size distributions being obtained depending on the type of mixing.
- the granulated continuous casting powder produced according to the invention can be used without any dust formation in steelworks in which fully automatic devices carry out a pneumatic or mechanical metering of continuous casting powder in continuous casting plants.
- a granulate is prepared in the following way:
- a granulate is prepared in the following way:
- Water glass of 37 ° BE serves as the granulating liquid. At a moisture content of 12.6%, the components are granulated in a continuous ploughshare mixer. The drying is then carried out in a fluid bed dryer with a residence time of 1 minute under the following conditions:
- the residual moisture of the granules is 0.2%, the bulk density is 0.905 kg / m.
- the components are granulated for 7 minutes in a ploughshare mixer with 11.7% moisture (including 1.2% colloidal silica). After drying in a fluid bed dryer with a hot air inlet of 140 ° C. and a residence time of 3 minutes, granules with a residual moisture content of 0.3% and a bulk density are obtained
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Silicon Compounds (AREA)
- Glanulating (AREA)
Abstract
Selon un procédé de production de poudres de granulés pour coulées continues à base d'oxydes refractaires, tels que le dioxyde de silicium, l'oxyde de calcium ou un produit dégageant de l'oxyde de calcium, de fondants, tels que des carbonates alcalins ou le fluorure de calcium et d'un milieu carboné, on réduit le mélange pulvérulent en granules sphériques et pleins en y ajoutant de l'eau, un granulant anorganique et le cas échéant un liant organique.According to a process for producing powders of granules for continuous castings based on refractory oxides, such as silicon dioxide, calcium oxide or a product releasing calcium oxide, fluxes, such as alkali carbonates or calcium fluoride and a carbonaceous medium, the pulverulent mixture is reduced to spherical and solid granules by adding water, an inorganic granulate and if necessary an organic binder.
Description
_ Λ _ Stranggießpulver _ Λ _ Continuous casting powder
Die Erfindung bezieht sich auf ein Verfahren zur Herstellung von granuliertem Stranggießpulver, das sich zum Stranggießen von Stählen aller Art eignet und die Anwendung hoher Gießgeschwindigkeiten erlaubt.The invention relates to a process for the production of granulated continuous casting powder which is suitable for the continuous casting of steels of all types and which permits the use of high casting speeds.
Beim Stranggießen von Stahl wird u.a. angestrebt, durch den Einsatz verbesserter Stranggießpulver die Gießgeschwindigkeit erhöhen zu können, und durch Automatisierung von Verfahrensablaufen eine Kosten¬ reduktion zu erzielen.When continuously casting steel, the aim is to be able to increase the casting speed by using improved continuous casting powder and to achieve a cost reduction by automating process sequences.
Für das Stranggießen von Stahl sind bereits zahlreiche verschiedene Gießpulver vorgeschlagen worden, siehe hiezu beispielsweise die in der AT-PS 342800 und in der DE-OS 34 03 279 beschriebenen losen Gießpulver und das in der DE-OS 26 14 957 angerührte, in Form von Hohlkugeln vorliegende Stranggießpulver mit einer Korngröße von über 60μm. Granulierte Pulver sind homogener, sie entmischen sich nicht bei Verpackung und Transport, verursachen weniger Staub und können besser durch automatische Geräte auf die Gießkokille dosiert werden.Numerous different casting powders have already been proposed for the continuous casting of steel, see, for example, the loose casting powder described in AT-PS 342800 and in DE-OS 34 03 279 and the one mixed in DE-OS 26 14 957 in the form of Hollow balls of continuous casting powder with a grain size of over 60μm. Granulated powders are more homogeneous, they do not separate during packaging and transport, cause less dust and can be better dosed onto the casting mold by automatic devices.
Die bisher bekannten Verfahren zur Herstellung von granuliertem Gießpulver beruhen auf einem Aufschläπmen der Gießpulverkomponenten in Wasser, wobei mindestens 30% Wasser benötigt werden, worauf diese Suspension dann versprüht oder verdüst oder extrudiert wird, um zu einem Granulat zu gelangen, welches abschließend getrocknet wird. Je nach dem angewendeten Verfahren erhält man offene, kugelför¬ mige Hohlkörper oder aber geschlossene, zylinderförmige volle Körper.The previously known methods for producing granulated casting powder are based on slurrying the casting powder components in water, at least 30% of water being required, whereupon this suspension is then sprayed or atomized or extruded in order to obtain a granulate which is then dried. Depending on the method used, open, spherical hollow bodies or closed, cylindrical full bodies are obtained.
Von der Form her werden an die Granulate verschiedene Forderungen gestellt:The shape of the granules is subject to various requirements:
Das Granulat soll sich pneumatisch wie auch mechanisch gut fördern lassen, es soll dabei das Kom nicht gebrochen werden. Es darf kein Abrieb entstehen, weil Staub die automatische Meß- und Dosierein¬ richtungen für die Beschickung der Kokille mit Gießpulvergranulat und dessen Niveauregulierung auf dem Badspiegel stören kann. Weiterhin
soll sich das Granulat am flüssigen Badspiegel in der Kokille gut verteilen, damit der flüssige Stahl gut abgedeckt wird.The granulate should be able to be conveyed pneumatically as well as mechanically, and the grain should not be broken. There must be no abrasion because dust can interfere with the automatic measuring and dosing devices for loading the mold with mold powder and its level control on the bath level. Farther The granulate should be well distributed on the liquid bath level in the mold so that the liquid steel is well covered.
Die nach den bisher bekannten Verfahren hergestellten Granulate haben in dieser Hinsicht Nachteile. Die Hohlkugeln weisen eine ungenügende mechanische Festigkeit auf, während die zylinderförmigen Körper sich schlecht am flüssigen Stahl in der Kokille verteilen.The granules produced by the previously known processes have disadvantages in this regard. The hollow spheres have insufficient mechanical strength, while the cylindrical bodies are poorly distributed on the liquid steel in the mold.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Herstellung eines granulierten Stranggießpulvers anzugeben, das nicht nur den Forderungen nach einem schnellen Aufschmelzen an der Grenzfläche zwischen flüssigem Stahl und Gießpulver und nach einer hohen Wärredämmung der aufgebrachten Gießpulverschicht genügt, sondern darüber hinaus eine ausreichende mechanische Festigkeit aufweist-,' um ohne zu brechen gefördert werden zu können, und überdies öglichst kugelförmig ist, un eine gute Verteilung beim Einsatz der Pulver zu gewährleisten. Weiterhin sollen mit einem solchen Verfahren Granulate innerhalb bestimmter Größen herstellbar sein, die Granulate sollen ein möglichst niedriges Schüttgewicht haben, das Pulvergemisch darf sich durch den Granuliervorgang nicht ent¬ mischen oder in seiner chemischen Analyse verändern, die Investitions¬ und Energiekosten der Herstellung sollen niedrig sein und schließlich sollen sich möglichst alle Pulvergemische mit einer einzigen Anlage zu Granulaten verarbeiten lassen.The invention is therefore based on the object of specifying a process for producing a granulated continuous casting powder which not only satisfies the requirements for rapid melting at the interface between liquid steel and casting powder and for high thermal insulation of the applied casting powder layer, but also sufficient mechanical Has strength, in order to be able to be conveyed without breaking and, moreover, is as spherical as possible and to ensure good distribution when the powders are used. Furthermore, with such a process it should be possible to produce granules within certain sizes, the granules should have a bulk density which is as low as possible, the powder mixture must not separate or change in its chemical analysis as a result of the granulation process, and the investment and energy costs for production should be low and finally, if possible, all powder mixtures should be able to be processed into granules in a single plant.
Diese Ziele werden erfindungsgernäß durch ein Verfahren zur Herstellung von granuliertem Stranggießpulver auf der Basis von hochschmelzenden Oxiden, wie Siliziumdioxid, Calciumoxid bzw. eines Calciumoxid liefernden Produktes, von Flußmitteln, wie Alkalicarbonaten bzw. Calciumfluorid, und eines Kohlenstoffträgers erreicht, das sich dadurch auszeichnet, daß das Pulvergemisch unterThese goals are achieved according to the invention by a process for the production of granulated continuous casting powder based on high-melting oxides, such as silicon dioxide, calcium oxide or a calcium oxide-producing product, fluxes, such as alkali metal carbonates or calcium fluoride, and a carbon carrier, which is characterized in that the powder mixture under
Zugabe von Wasser, eines anorganischen Granuliermittels und gegebenen¬ falls eines organischen Binders zu kugelförmigen, vollen Granulaten granuliert wird.
Dadurch, daß das erfindungsgemäß hergestellte granulierte volle Gießpulver in Kugelform vorliegt, weist es ein hohes Fließvermögen auf und läßt sich sehr gut auf dem Flüssigkeitsspiegel in der Gie߬ kokille verteilen. Zufolge seiner hohen mechanischen Festigkeit entsteht bei der Förderung und Kokillenbeschickung kein Abrieb, wodurch arbeitsplatztechnische und ökologische Probleme ebenso vermieden werden können wie Störungen der automatischen Meß- und Dosiereinrichtungen. Als besonders vorteilhaft erweist sich, daß das erfindungsgemäße Verfahren nur geringe Mengen an Wasser benötigt, um das Pulver zu granulieren. Dadurch werden erhebliche Energiemengen bei der anschließenden Trocknung eingespart.Addition of water, an inorganic granulating agent and optionally an organic binder is granulated to spherical, full granules. Because the granulated full casting powder produced according to the invention is in spherical form, it has a high fluidity and can be distributed very well on the liquid level in the casting mold. Due to its high mechanical strength, there is no abrasion during conveying and mold loading, which means that workplace-related and ecological problems can be avoided as well as malfunctions in the automatic measuring and metering devices. It has proven to be particularly advantageous that the process according to the invention requires only small amounts of water to granulate the powder. This saves considerable amounts of energy during the subsequent drying process.
In der praktischen Ausführung des erfindungsgemäßen Verfahrens wird ein Pulvergemisch auf der Basis von hochschmelzenden Oxiden, Flußmitteln und Kohlenstoffträger zweckmäßig in einem Mischer, welcher nach einem Schleuder- oder Wirbelverfahren arbeitet, unter Zugabe von anorganischem Granuliermittel und Wasser granuliert. Hiebei reicht ein sehr geringer Gehalt an anorganischon Granuliermittel von bis zu etwa 1 Gew.-%, sowie ein gleichfalls sehr niedriger Wassergehalt von etwa 10 bis 15 Gew.-9o aus.In the practical implementation of the process according to the invention, a powder mixture based on high-melting oxides, fluxes and carbon carriers is expediently granulated in a mixer which works by a centrifugal or whirling process with the addition of inorganic granulating agent and water. A very low content of inorganic granulating agent of up to about 1% by weight and a very low water content of about 10 to 15% by weight are sufficient.
Als anorganisches Granuliermittel eignet sich im besonderen Maße eine kolloidale Dispersion von amorphem Siliziumdioxid in Wasser, beispielsweise ein 30%iges Kieselsol. In dem Kieselsol liegt das Siliziumdioxid in Form von untereinander unvemetzten kugelförmigen Einzelpartikeln vor, die an der Oberfläche hydrolisiert sind. Bei der erfindungsgemäßen Anwendung geht das Sol in den Gelzustand über, d.h. in festes amorphes, wasserunlösliches Siliziumdioxid, unter Bindung der Gießpulverbestandteile zu einem festen, vollen Granulat. Als anorganisches Granuliermittel kann beispielsweise auch Wasserglas verwendet werden.A particularly suitable inorganic granulating agent is a colloidal dispersion of amorphous silicon dioxide in water, for example a 30% silica sol. In the silica sol, the silicon dioxide is present in the form of single, non-crosslinked spherical particles that are hydrolyzed on the surface. In the application according to the invention, the sol changes to the gel state, i.e. in solid amorphous, water-insoluble silicon dioxide, binding the casting powder components to a solid, full granulate. Water glass, for example, can also be used as the inorganic granulating agent.
Das granulierte, kugelförmige Stranggießpulver wird nach dem Granulier¬ vorgang getrocknet, zweckmäßig in einem Fließbetttrockner auf eine Restfeuchte von unter 1 Gew.-%, wobei mit einer Eingangsluftterπperatur
- ii -The granulated, spherical continuous casting powder is dried after the granulation process, expediently in a fluid bed dryer to a residual moisture content of less than 1% by weight, with an inlet air temperature - ii -
von z.B. 120 bis 180°C gearbeitet werden kann.from e.g. 120 to 180 ° C can be worked.
Falls eine zusätzliche Steigerung der mechanischen Festigkeit der GranLiate erzielt werden soll, kann dem Pulvergemisch vor dem Granu¬ lieren bis zu 2 Gew.-% organisches Bindemittel zugesetzt werden.If an additional increase in the mechanical strength of the GranLiate is to be achieved, up to 2% by weight of organic binder can be added to the powder mixture before granulation.
Zweckmäßig wird das Stranggießpulver auf eine Korngröße von etwa 200μm bis über Iπrn granuliert, wobei in Abhängigkeit von der Mischart unterschiedliche Korngrößenverteilungen erhalten werden.The continuous casting powder is expediently granulated to a grain size of approximately 200 μm to above 1 μm, different grain size distributions being obtained depending on the type of mixing.
Das erfindungsgemäß hergestellte granulierte Stranggießpulver kann ohne jegliche Staubbildung in Stahlwerken eingesetzt werden, in welchen vollautomatisch arbeitende Vorrichtungen eine pneumatische oder mechanische Dosierung von Stranggießpulver bei Stranggießanlagen vornehmen.The granulated continuous casting powder produced according to the invention can be used without any dust formation in steelworks in which fully automatic devices carry out a pneumatic or mechanical metering of continuous casting powder in continuous casting plants.
Die Erfindung wird an Hand der nachfolgenden AL^führungsbeispiele, ohne sie hierauf zu beschränken, weiter erläutert.The invention is further explained on the basis of the following AL ^ management examples, without being limited thereto.
BEISPIEL 1:EXAMPLE 1:
Aus den folgenden Komponenten:The following components:
Calciumaluminiumsilikat, Natriumcarbonat,Calcium aluminum silicate, sodium carbonate,
Flußspat,Fluorspar,
Kunstharzbinder,Synthetic resin binder,
Siliziumdioxid >Silicon dioxide>
Graphit undGraphite and
Flugasche - einer chemischen Ana.Fly ash - a chemical ana.
Si02 31,6%Si0 2 31.6%
CaO 28,4% ω203 12,2%CaO 28.4% ω 2 0 3 12.2%
Na20 1,7%Na 2 0 1.7%
Fe2°3 6,1% Fe 2 ° 3 6.1%
F 2,9%F 2.9%
C 15,CP/o
und mit der folgenden Komanalyse: über 0,125πτn 5%C 15, CP / o and with the following coma analysis: over 0.125πτn 5%
0,125-0,063 10% unter 0,063 85%0.125-0.063 10% below 0.063 85%
wird in folgender Weise ein Granulat bereitet:a granulate is prepared in the following way:
Die Komponenten werden 2 Minuten in einem Pflugscharmischer gemischt. Dann werden 15% Wasser mit einem Kieselsolgehalt von 4,3%, entsprechend einem Absolutgehalt von 0,65% Kieselsäure beigefügt. Nach einer Granulierzeit von 19 Minuten und einer Trocknungszeit von 4 Minuten in einem Fleißbetttrockner erhält man unter den nachfolgend angeführten Bedingungen folgende Komausbeute: Trockner, Lufteingangstermperatur 160°C Granuliertes Stranggießpulver Restfeuchte 0,3% Komanalyse: über 3mτι 5%The components are mixed in a ploughshare mixer for 2 minutes. Then 15% water with a silica content of 4.3%, corresponding to an absolute content of 0.65% silica, is added. After a granulation time of 19 minutes and a drying time of 4 minutes in a hard-bed dryer, the following com yield is obtained under the conditions listed below: dryer, air inlet temperature 160 ° C. Granulated continuous casting powder residual moisture 0.3% coma analysis: over 3mτι 5%
3 - 1mm 80% unter lmm 15%3 - 1mm 80% under lmm 15%
BEISPIEL 2:EXAMPLE 2:
AusOut
Calciumcarbonat,Calcium carbonate,
Siliziumdioxid,Silicon dioxide,
Graphit,Graphite,
Natriumcarbonat undSodium carbonate and
Calciumfluorid, entsprechend einer chemischen Analyse der Zusaπmensetzung von:Calcium fluoride, according to a chemical analysis of the composition of:
Si02 33%Si0 2 33%
CaO 30,5%CaO 30.5%
0,5%0.5%
^3^ 3
Na20 4,8%Na 2 0 4.8%
Fe203 0,3%Fe 2 0 3 0.3%
F 7,6%F 7.6%
11,4%
und mit einer Körnung: über 0,125mrι 7%11.4% and with a grain size: over 0.125mm 7%
0, 125-0, 063rtm 15% bis 0,63mm 78% wird in folgender Weise ein Granulat bereitet:0, 125-0, 063rtm 15% to 0.63mm 78% a granulate is prepared in the following way:
Als Granulierflüssigkeit dient Wasserglas von 37° BE. Bei einer Feuchte von 12,6% werden in einem kontinuierlichen Pflug- scharmiεcher die Komponenten granuliert. Die Trocknung erfolgt anschließend in einem Fließbetttrockner mit einer Verweilzeit von 1 Minute unter den folgenden Bedingungen:Water glass of 37 ° BE serves as the granulating liquid. At a moisture content of 12.6%, the components are granulated in a continuous ploughshare mixer. The drying is then carried out in a fluid bed dryer with a residence time of 1 minute under the following conditions:
Heißlufttemperatur 180°C Produkttemperatur 102°CHot air temperature 180 ° C product temperature 102 ° C
Man erhält ein Produkt mit der Körnung: über 0,8πm 6 ,5%A product with the grain size of over 0.8πm 6.5% is obtained.
0,4 - 0,8πm 70,9%0.4 - 0.8πm 70.9%
0,2 - 0,4mrι 22,4% unter 0,2mm 0,1%0.2 - 0.4mrι 22.4% below 0.2mm 0.1%
Die Restfeuchte des Granulates liegt bei 0,2%, das Schüttgewicht be¬ trägt 0,905 kg/m .The residual moisture of the granules is 0.2%, the bulk density is 0.905 kg / m.
BEISPIEL 3:EXAMPLE 3
Die folgenden Komponenten werden für 2 Minuten in einem Pflugschar¬ mischer gemischt:The following components are mixed in a ploughshare mixer for 2 minutes:
Calciumcarbonat, Siliziumdioxid, Aluminiumsilikat, Flußspat,Calcium carbonate, silicon dioxide, aluminum silicate, fluorspar,
Natriumcarbonat und Graphit,Sodium carbonate and graphite,
entsprechend einer chemischen Analyse der Zusammensetzung von:
Si0 30,7%according to a chemical analysis of the composition of: Si0 30.7%
CaO 29,0% *CaO 29.0% *
A1203 3,0%A1 2 0 3 3.0%
Na£0 4,6%Na £ 0 4.6%
F 6,9%F 6.9%
C 10,2%C 10.2%
Fe203 0,7%Fe 2 0 3 0.7%
Die Komanalyse des Ausgangsgemisches ergibt: über 0,125πm 10% 0,125-0,063rrm 25% unter 0,063mm 65%The co-analysis of the starting mixture shows: over 0.125πm 10% 0.125-0.063rrm 25% under 0.063mm 65%
Die Komponenten werden 7 Minuten lang in einem Pflugscharmischer mit 11,7% Feuchte (einschließlich1,2% kolloidale Kieselsäure) granu¬ liert. Nach einer Trocknung im Fließbetttrockner bei einem Heißluft¬ eintritt von 140°C und einer Verweilzeit von 3 Minuten erhält man ein Granulat mit einer Restfeuchte von 0,3%, einem SchüttgewichtThe components are granulated for 7 minutes in a ploughshare mixer with 11.7% moisture (including 1.2% colloidal silica). After drying in a fluid bed dryer with a hot air inlet of 140 ° C. and a residence time of 3 minutes, granules with a residual moisture content of 0.3% and a bulk density are obtained
3 von 0,90 kg/m und einer Körnung von über 1,5 mm 3 %3 of 0.90 kg / m and a grain size of over 1.5 mm 3%
0,2-1,5 88% unter 0,2mm 9%
0.2-1.5 88% under 0.2mm 9%
Claims
1. Verfahren zur Herstellung von granuliertem Stranggießpulver auf der Basis von hochschmelzenden Oxiden, wie Siliziumdioxid, Calciumoxid bzw. eines Calciumoxid liefernden Produktes, von Flußmitteln, wie Alkalicarbonaten bzw. Calciumfluorid, und eines Kohlenstoffträgers, dadurch gekennzeichnet, daß das Pulver¬ gemisch unter Zugabe von Wasser, eines anorganischen Granulier¬ mittels und gegebenenfalls eines organischen Binders zu kugel¬ förmigen, vollenGranulaten granuliert wird.1. A process for the production of granulated continuous casting powder based on high-melting oxides, such as silicon dioxide, calcium oxide or a calcium oxide-supplying product, of fluxes, such as alkali metal carbonates or calcium fluoride, and a carbon carrier, characterized in that the powder mixture with the addition of Water, an inorganic granulating agent and optionally an organic binder are granulated into spherical, full granules.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Pulvergemisch in einem Schleuder- oder Wirbelmischer unter Zugabe von anorganischem Gr.anuliermittel granuliert .wird.2. The method according to claim 1, characterized in that the powder mixture is granulated in a centrifugal or vortex mixer with the addition of inorganic granulating agent.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Pulvergemisch, unter Zugabe von bis zu etwa 1 Gew.-% anorgani¬ schem Granuliermittel und von etwa 10 bis 15 Gew.-% Wasser granuliert wird.3. The method according to claim 1 or 2, characterized in that the powder mixture, with the addition of up to about 1 wt .-% inorganic pelletizing agent and from about 10 to 15 wt .-% water is granulated.
4. Verfahren nach einem der Ansprüche 1 - 3, dadurch gekennzeichnet, daß als Granuliermittel eine kolloidale Dispersionvon amorphem Siliziumdioxid eingesetzt wird.4. The method according to any one of claims 1-3, characterized in that a colloidal dispersion of amorphous silicon dioxide is used as the granulating agent.
5. Verfahren nach einem der Ansprüche 1 - 4, dadurch gekennzeichnet, daß das granulierte Pulver in einem Fließbettrockner auf eine Restfeuchte von unter 1 Gew. -% getrocknet wird.5. The method according to any one of claims 1-4, characterized in that the granulated powder is dried in a fluid bed dryer to a residual moisture content of less than 1% by weight.
6. Verfahren nach einem der Ansprüche 1 - 5, dadurch gekennzeichnet, daß dem Pulvergemisch vor dem Granulieren bis zu 2 Gew.-% orgst- nisches Kunstharzbindemittel zugesetzt wird. 6. The method according to any one of claims 1-5, characterized in that up to 2 wt .-% organic synthetic resin binder is added to the powder mixture before granulation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0037887A AT394320B (en) | 1987-02-20 | 1987-02-20 | METHOD FOR PRODUCING GRANULATED CONTINUOUS POWDER |
| AT378/87 | 1987-02-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0338024A1 true EP0338024A1 (en) | 1989-10-25 |
| EP0338024B1 EP0338024B1 (en) | 1992-07-29 |
Family
ID=3489001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19880901755 Expired - Lifetime EP0338024B1 (en) | 1987-02-20 | 1988-02-19 | Powder for continuous casting |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0338024B1 (en) |
| AT (1) | AT394320B (en) |
| CA (1) | CA1305303C (en) |
| DE (1) | DE3873316D1 (en) |
| WO (1) | WO1988006066A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0673730B2 (en) * | 1990-11-30 | 1994-09-21 | 品川白煉瓦株式会社 | Exothermic mold powder for continuous casting |
| DE102004026443B3 (en) * | 2004-05-29 | 2006-02-02 | Stefanie Heller | Insulating granules for high temperature applications |
| CN114105658B (en) * | 2021-11-30 | 2023-02-28 | 河南通宇冶材集团有限公司 | Carbon-free drainage agent and preparation method thereof |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1569926A (en) * | 1967-03-31 | 1969-06-06 | ||
| BE801930A (en) * | 1972-07-06 | 1974-01-04 | Degussa | PROCESS FOR MANUFACTURING SHAPED BODIES USING MOLECULAR SIEVES |
| DE2345921A1 (en) * | 1973-09-12 | 1975-03-20 | Solint Consulting Establishmen | Heat-insulating cover for molten metals - using a granular with the same compsn. as the lining of the vessel |
| AT342800B (en) * | 1975-04-16 | 1978-04-25 | Tisza Bela & Co | CONTINUOUS POWDER |
| JPS51140830A (en) * | 1975-05-30 | 1976-12-04 | Nisshin Steel Co Ltd | Additions for casting |
| JPS586590B2 (en) * | 1975-06-18 | 1983-02-05 | サカイカガクコウギヨウ カブシキガイシヤ | Granular flux for casting |
| JPS53108033A (en) * | 1977-03-03 | 1978-09-20 | Nippon Chemical Ind | Additive of mold for continuous casting |
| JPS5514865A (en) * | 1978-07-19 | 1980-02-01 | Nippon Steel Corp | Powder for continuous casting of steel |
| DE2917763A1 (en) * | 1979-05-02 | 1980-11-13 | Wacker Chemie Gmbh | POWDER FOR CONTINUOUSLY STEEL |
| JPS5827979B2 (en) * | 1979-06-30 | 1983-06-13 | 新日本製鐵株式会社 | Manufacturing method of granular powder for continuous steel casting |
| GB8325438D0 (en) * | 1983-09-22 | 1983-10-26 | Foseco Int | Fluxes for casting metals |
| JPS60145234A (en) * | 1984-01-09 | 1985-07-31 | Nissan Motor Co Ltd | Device for forming bore serration |
| JPS61123454A (en) * | 1984-11-20 | 1986-06-11 | Kawasaki Steel Corp | Flux for continuous casting and its production |
| DE3537281A1 (en) * | 1984-11-23 | 1986-08-21 | VEB Bandstahlkombinat "Hermann Matern", DDR 1220 Eisenhüttenstadt | Method for producing casting powder for casting steel |
-
1987
- 1987-02-20 AT AT0037887A patent/AT394320B/en not_active IP Right Cessation
-
1988
- 1988-02-19 CA CA000559296A patent/CA1305303C/en not_active Expired - Fee Related
- 1988-02-19 EP EP19880901755 patent/EP0338024B1/en not_active Expired - Lifetime
- 1988-02-19 DE DE8888901755T patent/DE3873316D1/en not_active Expired - Fee Related
- 1988-02-19 WO PCT/AT1988/000009 patent/WO1988006066A1/en active IP Right Grant
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8806066A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ATA37887A (en) | 1991-09-15 |
| EP0338024B1 (en) | 1992-07-29 |
| CA1305303C (en) | 1992-07-21 |
| AT394320B (en) | 1992-03-10 |
| WO1988006066A1 (en) | 1988-08-25 |
| DE3873316D1 (en) | 1992-09-03 |
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