EP0338024A1 - Stranggiesspulver. - Google Patents
Stranggiesspulver.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
- 239000000843 powder Substances 0.000 title claims abstract description 36
- 238000009749 continuous casting Methods 0.000 title claims abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000008187 granular material Substances 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 10
- 239000000292 calcium oxide Substances 0.000 claims abstract description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 8
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 8
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 4
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 4
- 230000004907 flux Effects 0.000 claims abstract description 4
- 239000003979 granulating agent Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000005469 granulation Methods 0.000 claims description 5
- 230000003179 granulation Effects 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910000288 alkali metal carbonate Inorganic materials 0.000 claims description 2
- 150000008041 alkali metal carbonates Chemical class 0.000 claims description 2
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 claims description 2
- 238000001246 colloidal dispersion Methods 0.000 claims description 2
- 229920003002 synthetic resin Polymers 0.000 claims description 2
- 239000000057 synthetic resin Substances 0.000 claims description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims 1
- 229910052791 calcium Inorganic materials 0.000 claims 1
- 239000011575 calcium Substances 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 238000005453 pelletization Methods 0.000 claims 1
- 239000007787 solid Substances 0.000 abstract description 3
- 239000003513 alkali Substances 0.000 abstract 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 abstract 1
- 238000005266 casting Methods 0.000 description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 description 3
- 206010010071 Coma Diseases 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- IQDXNHZDRQHKEF-UHFFFAOYSA-N dialuminum;dicalcium;dioxido(oxo)silane Chemical compound [Al+3].[Al+3].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O IQDXNHZDRQHKEF-UHFFFAOYSA-N 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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)
- Silicon Compounds (AREA)
- Continuous Casting (AREA)
- Glanulating (AREA)
Description
Claims
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 (de) | 1989-10-25 |
| EP0338024B1 EP0338024B1 (de) | 1992-07-29 |
Family
ID=3489001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19880901755 Expired - Lifetime EP0338024B1 (de) | 1987-02-20 | 1988-02-19 | Stranggiesspulver |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0338024B1 (de) |
| AT (1) | AT394320B (de) |
| CA (1) | CA1305303C (de) |
| DE (1) | DE3873316D1 (de) |
| WO (1) | WO1988006066A1 (de) |
Families Citing this family (3)
| 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1569926A (de) * | 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 |
-
1987
- 1987-02-20 AT AT0037887A patent/AT394320B/de not_active IP Right Cessation
-
1988
- 1988-02-19 DE DE8888901755T patent/DE3873316D1/de not_active Expired - Fee Related
- 1988-02-19 CA CA000559296A patent/CA1305303C/en not_active Expired - Fee Related
- 1988-02-19 EP EP19880901755 patent/EP0338024B1/de not_active Expired - Lifetime
- 1988-02-19 WO PCT/AT1988/000009 patent/WO1988006066A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8806066A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ATA37887A (de) | 1991-09-15 |
| CA1305303C (en) | 1992-07-21 |
| DE3873316D1 (de) | 1992-09-03 |
| AT394320B (de) | 1992-03-10 |
| EP0338024B1 (de) | 1992-07-29 |
| WO1988006066A1 (fr) | 1988-08-25 |
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Legal Events
| Date | Code | Title | Description |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: TISZA, EVA MARIA VEREHELICHTE DONATI Owner name: DIPL.-ING. BELA TISZA & CO. VORMALS MUEHLEN-INDUST |
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