EP0338024B1 - Poudre pour coulee continue - Google Patents

Poudre pour coulee continue Download PDF

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Publication number
EP0338024B1
EP0338024B1 EP19880901755 EP88901755A EP0338024B1 EP 0338024 B1 EP0338024 B1 EP 0338024B1 EP 19880901755 EP19880901755 EP 19880901755 EP 88901755 A EP88901755 A EP 88901755A EP 0338024 B1 EP0338024 B1 EP 0338024B1
Authority
EP
European Patent Office
Prior art keywords
granulated
powder
weight
process according
water
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.)
Expired - Lifetime
Application number
EP19880901755
Other languages
German (de)
English (en)
Other versions
EP0338024A1 (fr
Inventor
Eva Maria Donati
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.)
DIPL.-ING. BELA TISZA & CO. VORMALS MUEHLEN-INDUST
TISZA, EVA MARIA VEREHELICHTE DONATI
Original Assignee
Dipl-Ing Bela Tisza & Co Vormals Muehlen-Industrie fur Zerkleinerung und Aufbereitung Gesmbh
Tisza Eva Maria verehelichte Donati
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 Dipl-Ing Bela Tisza & Co Vormals Muehlen-Industrie fur Zerkleinerung und Aufbereitung Gesmbh, Tisza Eva Maria verehelichte Donati filed Critical Dipl-Ing Bela Tisza & Co Vormals Muehlen-Industrie fur Zerkleinerung und Aufbereitung Gesmbh
Publication of EP0338024A1 publication Critical patent/EP0338024A1/fr
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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 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 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.
  • DE-OS 35 37 281 describes a process for the production of casting powder for casting steel, in which it is pointed out as an essential measure that some of the reactions which take place when the powder is melted are already present is shifted into the manufacturing process.
  • the mixture components must be comminuted and mixed together in an aqueous phase, after which the resulting suspension is dried and granulated in a fluidized bed.
  • the shape of the granules is subject to various requirements:
  • the granulate should be easy to convey both pneumatically and 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 charging the mold with mold powder and its level regulation on the bath level. Furthermore, the granules should be distributed well 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 the liquid jet and casting powder and for high thermal insulation of the applied casting powder layer, but also sufficient mechanical strength has to be able to be conveyed without breaking, and moreover is as spherical as possible to ensure a good distribution when using the powder.
  • granules within certain sizes should be producible with such a method, the granules should have the lowest possible bulk density, the powder mixture must not separate or change in its chemical analysis as a result of the granulation process, the investment and energy costs of the production should be low and finally If possible, all powder mixtures should be able to be processed into granules with a single system.
  • these objectives are achieved 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 dry powder Starting components with the addition of water, an inorganic granulating agent and optionally an organic binder are granulated in a centrifugal or vortex mixer to give spherical, full geranules.
  • high-melting oxides such as silicon dioxide, calcium oxide or a calcium oxide-producing product
  • fluxes such as alkali metal carbonates or calcium fluoride
  • a carbon carrier which is characterized in that the dry powder
  • an inorganic granulating agent and optionally an organic binder are granulated in a centrifugal or vortex mixer to give spherical, full geranules.
  • 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 dosing devices. It has proven 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 spherical individual particles which are not cross-linked with one another and which 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 from 120 to 180 ° C, for example.
  • the continuous casting powder is expediently granulated to a grain size of approximately 200 ⁇ m to more than 1 mm, 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.
  • 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 grain yield is obtained under the following conditions: Dryer, air inlet temperature 160 ° C Granulated casting powder, residual moisture 0.3% Grain analysis:
  • a granulate is prepared in the following way:
  • the residual moisture of the granules is 0.2%, the bulk density is 0.905 kg / m3.
  • the grain analysis of the starting mixture shows:
  • 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 of 0.3%, a bulk density of 0.90 kg / m3 and a grain size of

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Silicon Compounds (AREA)
  • Continuous Casting (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.

Claims (5)

1. Procédé de préparation de poudre granulée pour coulée continue, à base d'oxydes à point de fusion élevé, comme le dioxyde de silicium, l'oxyde de calcium ou un produit donnant de l'oxyde de calcium, de flux comme des carbonates de métal alcalin ou du fluorure de calcium, et d'une source de carbone, caractérisé en ce qu'il consiste à granuler les constituants de départ secs et pulvérulents, avec addition d'eau, d'un agent minéral de granulation et, le cas échéant, d'un liant organique, en des granulés sphériques et pleins dans un mélangeur centrifuge ou dans un mélangeur à turbulence.
2. Procédé suivant la revendication 1, caractérisé en ce qu'il consiste à granuler les constituants de départ pulvérulents avec addition de jusqu'à 1 % en poids environ d'agent de granulation minéral et de 10 à 15 % en poids d'eau.
3. Procédé suivant la revendication 1 ou 2, caractérisé en ce qu'il consiste à utiliser, comme agent de granulation, une dispersion colloïdale de dioxyde de silicium amorphe.
4. Procédé suivant l'une des revendications 1 à 3, caractérisé en ce qu'il consiste à ajouter au mélange de poudre, avant la granulation, jusqu'à 2 % en poids de liant à base de résine synthétique organique.
5. Procédé suivant l'une des revendications 1 à 4, caractérisé en ce qu'il consiste à sécher la poudre granulée dans un sécheur à lit fluidisé, jusqu'à une humidité résiduelle inférieure à 1 % en poids.
EP19880901755 1987-02-20 1988-02-19 Poudre pour coulee continue Expired - Lifetime EP0338024B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT378/87 1987-02-20
AT0037887A AT394320B (de) 1987-02-20 1987-02-20 Verfahren zur herstellung von granuliertem stranggiesspulver

Publications (2)

Publication Number Publication Date
EP0338024A1 EP0338024A1 (fr) 1989-10-25
EP0338024B1 true EP0338024B1 (fr) 1992-07-29

Family

ID=3489001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880901755 Expired - Lifetime EP0338024B1 (fr) 1987-02-20 1988-02-19 Poudre pour coulee continue

Country Status (5)

Country Link
EP (1) EP0338024B1 (fr)
AT (1) AT394320B (fr)
CA (1) CA1305303C (fr)
DE (1) DE3873316D1 (fr)
WO (1) WO1988006066A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0673730B2 (ja) * 1990-11-30 1994-09-21 品川白煉瓦株式会社 連続鋳造用発熱型モールドパウダー
DE102004026443B3 (de) * 2004-05-29 2006-02-02 Stefanie Heller Isolierende Granulate für Anwendungen im Hochtemperaturbereich
CN114105658B (zh) * 2021-11-30 2023-02-28 河南通宇冶材集团有限公司 一种无碳引流剂及其制备方法

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1569926A (fr) * 1967-03-31 1969-06-06
BE801930A (fr) * 1972-07-06 1974-01-04 Degussa Procede de fabrication de corps formes a l'aide de tamis moleculaires
DE2345921A1 (de) * 1973-09-12 1975-03-20 Solint Consulting Establishmen Abdeckmasse fuer metallurgische schmelzen
AT342800B (de) * 1975-04-16 1978-04-25 Tisza Bela & Co Stranggiesspulver
JPS51140830A (en) * 1975-05-30 1976-12-04 Nisshin Steel Co Ltd Additions for casting
JPS586590B2 (ja) * 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 鋳造用顆粒状フラックス
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 (de) * 1979-05-02 1980-11-13 Wacker Chemie Gmbh Giesspulver zum stranggiessen von stahl
JPS5827979B2 (ja) * 1979-06-30 1983-06-13 新日本製鐵株式会社 鋼の連続鋳造用顆粒型パウダ−の製造法
GB8325438D0 (en) * 1983-09-22 1983-10-26 Foseco Int Fluxes for casting metals
JPS60145234A (ja) * 1984-01-09 1985-07-31 Nissan Motor Co Ltd 内径セレ−シヨン成形装置
JPS61123454A (ja) * 1984-11-20 1986-06-11 Kawasaki Steel Corp 連続鋳造用フラツクスならびにその製造方法
DE3537281A1 (de) * 1984-11-23 1986-08-21 VEB Bandstahlkombinat "Hermann Matern", DDR 1220 Eisenhüttenstadt Verfahren zur herstellung von giesspulver zum vergiessen von stahl

Also Published As

Publication number Publication date
EP0338024A1 (fr) 1989-10-25
ATA37887A (de) 1991-09-15
CA1305303C (fr) 1992-07-21
DE3873316D1 (de) 1992-09-03
AT394320B (de) 1992-03-10
WO1988006066A1 (fr) 1988-08-25

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