EP0338024A1 - Poudre pour coulee continue. - Google Patents

Poudre pour coulee continue.

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
Application number
EP19880901755
Other languages
German (de)
English (en)
Other versions
EP0338024B1 (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 Muhlen-Industrie fur Zerkleinerung und Aufbereitung Gesmbh
Tisza Bela & Co
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 Muhlen-Industrie fur Zerkleinerung und Aufbereitung Gesmbh, Tisza Bela & Co filed Critical Dipl-Ing Bela Tisza & Co Vormals Muhlen-Industrie fur Zerkleinerung und Aufbereitung Gesmbh
Publication of EP0338024A1 publication Critical patent/EP0338024A1/fr
Application granted granted Critical
Publication of EP0338024B1 publication Critical patent/EP0338024B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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

Landscapes

  • 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.
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 true EP0338024A1 (fr) 1989-10-25
EP0338024B1 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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8806066A1 *

Also Published As

Publication number Publication date
AT394320B (de) 1992-03-10
EP0338024B1 (fr) 1992-07-29
ATA37887A (de) 1991-09-15
WO1988006066A1 (fr) 1988-08-25
DE3873316D1 (de) 1992-09-03
CA1305303C (fr) 1992-07-21

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