WO1992017294A1 - Verfahren zur herstellung von granuliertem stranggiesspulver - Google Patents
Verfahren zur herstellung von granuliertem stranggiesspulver Download PDFInfo
- Publication number
- WO1992017294A1 WO1992017294A1 PCT/AT1992/000041 AT9200041W WO9217294A1 WO 1992017294 A1 WO1992017294 A1 WO 1992017294A1 AT 9200041 W AT9200041 W AT 9200041W WO 9217294 A1 WO9217294 A1 WO 9217294A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dispersion
- drying chamber
- continuous casting
- spray drying
- casting powder
- Prior art date
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 previously known methods for the production of 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 diluted or extruded in order to obtain a granulate which is then dried.
- this suspension is then sprayed or diluted 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 granules should be easy to convey 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 granulate 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 balls have insufficient mechanical strength, while the cylindrical-shaped 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 a sufficient mechanical one Has strength in order to be able to be conveyed without breaking and, moreover, is as spherical as possible in order to ensure good distribution when the powders are used.
- granules within certain sizes should be producible with such a method, the granules should have the lowest possible bulk density, the powder mixture should not separate or change in its chemical analysis through 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.
- 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 prepares an aqueous dispersion of the powdery starting components in a turbomixer and the dispersion obtained from stationary nozzles arranged in the transition region from the conical lower part to the cylindrical upper part of a spray drying chamber in countercurrent to hotter, atomized the spray drying chamber from top to bottom through dry air and predominantly full spherical granules is granulated.
- 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 prepares an aqueous dispersion of the powdery starting components in a turbomixer and the dispersion obtained from stationary nozzles arranged in
- the granulated casting powder produced in accordance with the invention is in spherical form and can therefore be distributed very well on the liquid level in the casting mold. Due to its high mechanical strength, there is no abrasion during the conveyance and the removal of chemicals, which means that technical and ecological problems at the workplace can be avoided, as can faults in the automatic measuring and metering devices.
- the atomizing nozzles are fed with the aqueous dispersion using a piston pump with adjustable output in order to convey the dispersion to the nozzle at constant pressure.
- the dispersion is atomized in countercurrent to the drying air (fountain principle) in a spray dryer from fixed nozzles. These fixed nozzles are arranged in the transition area from the lower part which tapers in the shape of a truncated cone to the cylindrical upper part of the drying tower located above.
- the spray-dried, full spherical granules are continuously discharged from the bottom of the drying tower via a lock.
- This special arrangement of the nozzles and the counterflow of the drying air ensure controllable and uniform atomization of the food product, so that an optimal particle size distribution can be achieved.
- 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.
- This dispersion (density approx. 1.5 kg / l, viscosity approx. 6 ° E) is fed into a nozzle ring in the transition area of a conical spray drying plant with a pressure of more than 10 bar.
- the drying air enters the drying chamber at a temperature of about 530 to 540 ° C in countercurrent at the top and leaves the drying chamber at the bottom with an outlet temperature of about 180 ° C.
- the practically dry spherical product (product moisture content when leaving the drying chamber: 0.1 to 0.2% by weight) has a narrow grain size spectrum, with a predominant grain size of about 0.2 mm in diameter.
- aqueous dispersion is prepared, to which 1% o sodium silicate and 2% o REOTAN are added.
- the dispersion obtained (density 1.440 kg / l, viscosity 1.4 ° E) is spray-dried analogously to Example 1 and leads to spherical granules which can be used directly as casting powder without further drying.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Glanulating (AREA)
- Silicon Compounds (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0068691A AT404098B (de) | 1991-03-28 | 1991-03-28 | Verfahren zur herstellung von granuliertem stranggiesspulver |
ATA686/91 | 1991-03-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992017294A1 true WO1992017294A1 (de) | 1992-10-15 |
Family
ID=3497143
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AT1992/000041 WO1992017294A1 (de) | 1991-03-28 | 1992-03-27 | Verfahren zur herstellung von granuliertem stranggiesspulver |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0577711A1 (de) |
AT (1) | AT404098B (de) |
IT (1) | IT1255392B (de) |
WO (1) | WO1992017294A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000020335A1 (de) * | 1998-10-05 | 2000-04-13 | Riedel-De Haen Gmbh | Verfahren zur herstellung komplexer fluoroaluminate, die hergestellten fluoroaluminate und verwendung von sprühtrocknung und polyalkylenglykolen zur steuerung der struktur von fluoroaluminaten |
CN1082984C (zh) * | 1996-08-16 | 2002-04-17 | 拜尔公司 | 生产无机颗粒的方法及其用途 |
EP1602425A1 (de) * | 2004-05-29 | 2005-12-07 | Stefanie Heller | Isolierende Granulate für Metallstranggiessen und deren Herstellungsverfahren |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2013067A1 (en) * | 1967-06-26 | 1971-06-16 | N V Porselem en Tegelfabriek MOSA, Maastricht (Niederlande) | Drying of aqueous suspensions |
AT342800B (de) * | 1975-04-16 | 1978-04-25 | Tisza Bela & Co | Stranggiesspulver |
DE2917763A1 (de) * | 1979-05-02 | 1980-11-13 | Wacker Chemie Gmbh | Giesspulver zum stranggiessen von stahl |
DE3537281A1 (de) * | 1984-11-23 | 1986-08-21 | VEB Bandstahlkombinat "Hermann Matern", DDR 1220 Eisenhüttenstadt | Verfahren zur herstellung von giesspulver zum vergiessen von stahl |
EP0137734B1 (de) * | 1983-09-22 | 1988-08-03 | Foseco International Limited | Flussmitteln zum Giessen von Metallen |
DE3804279A1 (de) * | 1987-02-12 | 1988-08-25 | Shinagawa Refractories Co | Giesszusatzmittel zur verwendung beim stranggiessen von stahl |
DE3835492A1 (de) * | 1987-10-19 | 1989-04-27 | Shinagawa Refractories Co | Giessformzusatz zum stranggiessen von stahl |
DE3806062A1 (de) * | 1988-02-26 | 1989-09-07 | Heinz Kayser | Verfahren zum herstellen von pumpfaehigem, auch als brand- und schallschutz einsatzfaehigem baustoff und geeignete vorrichtung |
-
1991
- 1991-03-28 AT AT0068691A patent/AT404098B/de not_active IP Right Cessation
- 1991-07-19 IT ITMI912004A patent/IT1255392B/it active IP Right Grant
-
1992
- 1992-03-27 EP EP92908741A patent/EP0577711A1/de not_active Withdrawn
- 1992-03-27 WO PCT/AT1992/000041 patent/WO1992017294A1/de not_active Application Discontinuation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2013067A1 (en) * | 1967-06-26 | 1971-06-16 | N V Porselem en Tegelfabriek MOSA, Maastricht (Niederlande) | Drying of aqueous suspensions |
AT342800B (de) * | 1975-04-16 | 1978-04-25 | Tisza Bela & Co | Stranggiesspulver |
DE2917763A1 (de) * | 1979-05-02 | 1980-11-13 | Wacker Chemie Gmbh | Giesspulver zum stranggiessen von stahl |
EP0137734B1 (de) * | 1983-09-22 | 1988-08-03 | Foseco International Limited | Flussmitteln zum Giessen von Metallen |
DE3537281A1 (de) * | 1984-11-23 | 1986-08-21 | VEB Bandstahlkombinat "Hermann Matern", DDR 1220 Eisenhüttenstadt | Verfahren zur herstellung von giesspulver zum vergiessen von stahl |
DE3804279A1 (de) * | 1987-02-12 | 1988-08-25 | Shinagawa Refractories Co | Giesszusatzmittel zur verwendung beim stranggiessen von stahl |
DE3835492A1 (de) * | 1987-10-19 | 1989-04-27 | Shinagawa Refractories Co | Giessformzusatz zum stranggiessen von stahl |
DE3806062A1 (de) * | 1988-02-26 | 1989-09-07 | Heinz Kayser | Verfahren zum herstellen von pumpfaehigem, auch als brand- und schallschutz einsatzfaehigem baustoff und geeignete vorrichtung |
Non-Patent Citations (1)
Title |
---|
KIRK-OTHMER "Encyclopedia of chemical technology" 3. Auflage, Band 21: "Suspen- ded-Particle Techniques" 1983, JOHN WILEY & SONS INC., USA * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1082984C (zh) * | 1996-08-16 | 2002-04-17 | 拜尔公司 | 生产无机颗粒的方法及其用途 |
WO2000020335A1 (de) * | 1998-10-05 | 2000-04-13 | Riedel-De Haen Gmbh | Verfahren zur herstellung komplexer fluoroaluminate, die hergestellten fluoroaluminate und verwendung von sprühtrocknung und polyalkylenglykolen zur steuerung der struktur von fluoroaluminaten |
CZ298437B6 (cs) * | 1998-10-05 | 2007-10-03 | Riedel-De Haen Gmbh | Zpusob výroby komplexních fluorohlinitanu |
EP1602425A1 (de) * | 2004-05-29 | 2005-12-07 | Stefanie Heller | Isolierende Granulate für Metallstranggiessen und deren Herstellungsverfahren |
Also Published As
Publication number | Publication date |
---|---|
IT1255392B (it) | 1995-10-31 |
ATA68691A (de) | 1998-01-15 |
ITMI912004A1 (it) | 1993-01-19 |
EP0577711A1 (de) | 1994-01-12 |
ITMI912004A0 (it) | 1991-07-19 |
AT404098B (de) | 1998-08-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE2908136A1 (de) | Verfahren und vorrichtung zur herstellung von harnstoffkoernchen | |
EP1126017B1 (de) | Verfahren zur Herstellung von Vollwaschmitteln und Vollwaschmittelkomponenten | |
EP1373586B1 (de) | Verfahren zur herstellung von hartmetallgranulat | |
DE2509730A1 (de) | Sorptionstraeger und verfahren zu dessen herstellung | |
EP0787682A1 (de) | Verfahren zur Herstellung von Natriumpercarbonat in Granulatform | |
EP3455177B1 (de) | Verfahren zur herstellung von mikrohohlkugeln aus glas | |
AT404098B (de) | Verfahren zur herstellung von granuliertem stranggiesspulver | |
EP0924268B1 (de) | Perlruss und Verfahren zu seiner Herstellung | |
EP3480176B1 (de) | Mikrohohlkugeln aus glas und verfahren zu deren herstellung | |
AT394320B (de) | Verfahren zur herstellung von granuliertem stranggiesspulver | |
DD140987B1 (de) | Kontinuierliches herstellungsverfahren granulierter wasch-und reinigungsmittel in wirbelschichtapparaten | |
AT407402B (de) | Verfahren zur herstellung von für einen direktreduktionsprozess einsetzbarem einsatzmaterial | |
EP0047794B1 (de) | Verfahren zur gleichmässigen, geschlossenen Oberflächenbeschichtung einzelner Körner von rieselfähigen Gütern und Vorrichtung zu seiner Durchführung | |
DE19724142B4 (de) | Verfahren zur Herstellung von granuliertem Mischdünger | |
DE2940263A1 (de) | Verfahren zur homogenen, gleichmaessigen, geschlossenen oberflaechenbeschichtung auf den einzelnen koernern koerniger, rieselfaehiger gueter und vorrichtung zu seiner durchfuehrung | |
DE4342331A1 (de) | Pigmentgranulat zum Einfärben von Baustoffen | |
WO2001028954A1 (de) | Farbpigmentgranalien und verfahren zur herstellung | |
DE19904657A1 (de) | Verfahren zur Herstellung von Vollwaschmitteln und Vollwaschmittelkomponenten | |
DE3925966A1 (de) | Lp 86 148 - verfahren zur herstellung von koernigem paraformaldehyd | |
DE939737C (de) | Verfahren und Vorrichtung zur Herstellung eines pulverfoermigen latenthydraulischen Stoffes | |
DE1571941C (de) | Verfahren zum Herstellen von pulverförmigen Füllmassen für galvanische Elemente | |
DE1930194A1 (de) | Kaliduengergranulat | |
AT259530B (de) | Verfahren und Vorrichtung zum Granulieren staubförmiger Stoffe und/oder zur Umhüllung von Granulaten, Tabletten u. ähnl. Gegenständen | |
DE1667205C (de) | Verfahren und Vorrichtung zur Her stellung von Granulat aus Losungen und Suspensionen | |
DE1782092A1 (de) | Verfahren zum Mischen von pulverfoermigen und feinkoernigen Feststoffen mit Fluessigkeiten und Vorrichtung zur Durchfuehrung des Verfahrens |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CA RU US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IT LU MC NL SE |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
EX32 | Extension under rule 32 effected after completion of technical preparation for international publication |
Ref country code: UA |
|
LE32 | Later election for international application filed prior to expiration of 19th month from priority date or according to rule 32.2 (b) |
Ref country code: UA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1992908741 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1992908741 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: CA |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1992908741 Country of ref document: EP |