DE1209930B - Process for the protection of the refractory, for example made of magnesite bricks, lining of degassing vessels against liquid steel and slag - Google Patents
Process for the protection of the refractory, for example made of magnesite bricks, lining of degassing vessels against liquid steel and slagInfo
- Publication number
- DE1209930B DE1209930B DED38284A DED0038284A DE1209930B DE 1209930 B DE1209930 B DE 1209930B DE D38284 A DED38284 A DE D38284A DE D0038284 A DED0038284 A DE D0038284A DE 1209930 B DE1209930 B DE 1209930B
- Authority
- DE
- Germany
- Prior art keywords
- slag
- lining
- refractory
- metal
- vacuum vessel
- 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.)
- Pending
Links
- 238000007872 degassing Methods 0.000 title claims description 17
- 239000002893 slag Substances 0.000 title claims description 16
- 229910000831 Steel Inorganic materials 0.000 title claims description 10
- 238000000034 method Methods 0.000 title claims description 10
- 239000010959 steel Substances 0.000 title claims description 10
- 239000007788 liquid Substances 0.000 title claims description 4
- 239000011449 brick Substances 0.000 title description 3
- 239000001095 magnesium carbonate Substances 0.000 title description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 title description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 title description 3
- 235000014380 magnesium carbonate Nutrition 0.000 title description 3
- 239000010410 layer Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 239000011241 protective layer Substances 0.000 claims description 5
- 239000010436 fluorite Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims description 2
- 239000000395 magnesium oxide Substances 0.000 claims description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000011819 refractory material Substances 0.000 claims description 2
- 239000011247 coating layer Substances 0.000 claims 1
- 239000004615 ingredient Substances 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 4
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009849 vacuum degassing Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229910052851 sillimanite Inorganic materials 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
- F27D1/1678—Increasing the durability of linings; Means for protecting
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/195—Alkaline earth aluminosilicates, e.g. cordierite or anorthite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Description
Verfahren zum Schutz der feuerfesten, zum Beispiel aus Magnesitsteinen bestehenden Zustellung von Entgasungsgefäßen gegen flüssigen Stahl und Schlacke Die Erfindung bezieht sich auf ein Verfahren zum Schutz der feuerfesten, beispielsweise aus Magnesitsteinen bestehenden Zustellung von Entgasungsgefäßen gegen den Angriff flüssigen Stahls der mit dem Stahl in das Entgasungsgefäß gelangenden Schlacke.Method of protecting the refractories, for example from magnesite bricks existing lining of degassing vessels against liquid steel and slag The invention relates to a method of protecting the fireproof, for example made of magnesite bricks lining of degassing vessels against the attack liquid steel of the slag that enters the degassing vessel with the steel.
Bei der Vakuumentgasung von Stahlschmelzen hat es sich herausgestellt, daß die Haltbarkeit der hochfeuerfesten Zustellung der Vakuumgefäße erheblich geringer ist als diejenige einer gleichartigen Zustellung anderer metallurgischer Gefäße. Ursächlich für die geringe Haltbarkeit der feuerfesten Zustellung ist die mit dem flüssigen Metall in das Entgasungsgefäß gelangende Schlacke, die bei den dort herrschenden Verhältnissen in das Steinmaterial der Auskleidung infiltriert, ein Vorgang, der sich unter reduzierenden Bedingungen besonders ungünstig auswirkt. Es läßt sieh betrieblich aber kaum vermeiden, daß beim Chargieren des flüssigen Metalls auf dem Metallbad noch befindliche Schlacke mit in die Vakuumkammer gelangt und dort ihre zerstörende Wirk 0 -ung auf die Zustellung ausübt.In the case of vacuum degassing of molten steel, it has been found that the durability of the highly refractory lining of the vacuum vessels is considerably less than that of a similar lining of other metallurgical vessels. The reason for the low durability of the refractory lining is the slag that gets into the degassing vessel with the liquid metal, which under the conditions prevailing there infiltrates the stone material of the lining, a process that has a particularly unfavorable effect under reducing conditions. It can look operationally but hardly avoid that arrives during the charging of the liquid metal at the metal slag which is still with the vacuum chamber, where their destructive action exerts 0 -ung on delivery.
Nach der deutschen Auslegeschrift 1063 954 ist es bekannt, basische und saure Schamottesteine für Kammergitter der Glasindustrie und in Hüttenwerken mit einer im wesentlichen Kieselsäure, Tonerde und Vanadiumpentoxyd enthaltenden Glasur gegen den Angriff von Staub und insbesondere Alkalien enthaltender Gase zu schützen. Die für die Glasurbildung verwendbaren bekannten Fritten bestehen zu 60 bis 70 % aus Kieselsäure, 20 bis 25 1/o Aluminiumoxyd, 3 bis 5 % Vanadiumpentoxyd sowie geringen Gehalten anderer Oxyde. Diese Mischungen besitzen je- doch eine so niedrige Schmelztemperatur, daß sie für den Schutz der feuerfesten Auskleidung von Stahlentgasungsgefäßen nicht verwendbar sind. Die bekannte Glasur würde nämlich bei den Arbeitstemperaturen der Vakuumentgasung in den schmelzflüssigen Zustand überführt, wonach sie nicht mehr in der Lage ist, einen Schutzfilm auf der feuerfesten Zustellung des Entgasungsgefäßes zu bilden.According to German Auslegeschrift 1063 954 it is known to protect basic and acidic firebricks for chamber grids in the glass industry and in metallurgical plants with a glaze essentially containing silica, alumina and vanadium pentoxide against attack by dust and, in particular, gases containing alkalis. The known frits that can be used for glaze formation consist of 60 to 70 % silica, 20 to 25 1 / o aluminum oxide, 3 to 5 % vanadium pentoxide and small contents of other oxides. However, these mixtures have such a low melting temperature that they cannot be used to protect the refractory lining of steel degassing vessels. The known glaze would namely be converted into the molten state at the working temperatures of the vacuum degassing, after which it is no longer able to form a protective film on the refractory lining of the degassing vessel.
Die der Erfindung zugrunde liegendeAufgabe besteht nun darin, die feuerfeste Zustellung von Entgasungsgefäßen durch eitle auch bei der Entgasun 'astemperatur noch beständige und an der Gefäßausmauerung haftende keramische Schutzschicht gegen C CI den Angriff durch die Schmelze und die mit dieser in das Entgasungsgefäß gelangenden Schlacke zu sichern.The object on which the invention is based now consists in the Refractory lining of degassing vessels by eitle even at the degassing temperature Ceramic protective layer that is still stable and adheres to the vessel lining C CI the attack by the melt and the melt that enters the degassing vessel with it Secure slag.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß eine feuerfeste Mischung aus 5501o Sillimanit (651/o, A120,35 35% Si02), 3011/o Magnesiumoxyd, 10% Aluminiumoxyd und 5019 Flußspat auf das Mauerwerk der Zustellung so aufgebracht wird, daß sich auf der feuerfesten Zustellung des Entgasungsgefäßes bei der üblichen Entgasungstcmperatur von Stählen (etwa 1600' Q eine zähflüssige, etwa 2 bis 3 mm starke Schutzschicht ergibt. Die flußspatfreie Dreistoffmischung nach der Erfindung besitzt im Gegensatz zu den bekannten Glasuren einen zwischen 1800 und 19001 C liegenden Schmelzpunkt, der durch die Zugabe von Flußspat bis auf etwa 1600' C herabgedrückt werden kann. Da die Bellandlungstemperatur im Entgasungsgefäß gewöhnlich 16501' C beträgt, befindet sich die 2 bis 3 mm dicke Schutzschicht nach der Erfindung während der Entgasungsbehandlung im zähflüssigen Zustand, in dem sie das Mauerwerk gleichmäßig bedeckt, in die Poren der Steine eindringt und diese verschließt. Auf diese Weise wird die Infiltration der mit dem zu entcrasenden Stahl in das Entgasungsgefäß gelangenden Schlacke in die feuerfeste Zustellung, mit Sicherheit unterbunden.According to the invention, this object is achieved in that a refractory mixture of 5501o sillimanite (651 / o, A120.35 35% Si02), 3011 / o magnesium oxide, 10% aluminum oxide and 5019 fluorspar is applied to the brickwork of the lining so that the refractory lining of the degassing vessel at the usual degassing temperature of steels (about 1600 ° C. results in a viscous protective layer about 2 to 3 mm thick. The fluorspar-free three-substance mixture according to the invention, in contrast to the known glazes, has a melting point between 1800 and 19001 C, which can be pressed down by adding fluorspar to about 1600 ° C. Since the treatment temperature in the degassing vessel is usually 16501 ° C., the 2 to 3 mm thick protective layer according to the invention is in the viscous state during the degassing treatment The masonry is evenly covered, penetrates the pores of the stone and seals them Infiltration of the slag that got into the degassing vessel with the steel to be decased into the refractory lining, prevented with certainty.
Der Schutz der feuerfesten Zustellung kann nach einem weiteren Merkmal der Erfindung auch aus zwei Schichten aufgebaut werden, von denen die untere aus reinem Sand und die obere aus der erfindungsgemäßen Dreistoffmischung und Flußspat besteht. Dabei kann die Abdeckschicht in Form einer pulverförmigen Mischung ihrer Bestandteile vor der Inbetriebnahme des Vakuumgefäßes auf dessen Zustellung bzw. auf die aus Sand bestehende Grundschicht aufgebracht und das Vakuumgefäß danach auf die Betriebstemperatur von etwa 1600' C aufgeheizt werden.According to a further feature of the invention, the protection of the refractory lining can also be built up from two layers, the lower of which consists of pure sand and the upper of the three-substance mixture according to the invention and fluorspar. The cover layer in the form of a powdery mixture of its constituents can be applied to the lining of the vacuum vessel or to the base layer consisting of sand before the vacuum vessel is put into operation, and the vacuum vessel can then be heated to the operating temperature of about 1600 ° C.
Das Verfahren nach der Erfindung kann auch in der Weise ausgeführt werden, daß das zu entgasende Metall aus dem Schmelzofen schlackenfrei in eine Pfanne abgestochen, hier mit einer aus den obenerwähnten Bestandteilen der Abdeckschicht gebildeten Schlacke bedeckt und danach Metall und Schlacke in das Vakuumgefäß eingeführt werden. Nach dem Ablassen des entgasten Metalls bleibt die Schlacke als zähflüssiger, schützender Überzug auf der Zustellung der Vakuumkammer zurück. Schließlich können die Bestandteile der Abdeckschicht auch nach dem schlackenfreien Einfüllen des zu entgasenden Metalls gesondert in das Vakuumgefäß eingeführt werden.The method according to the invention can also be carried out in such a way that the metal to be degassed is tapped free of slag from the melting furnace into a pan, here covered with a slag formed from the above-mentioned components of the cover layer and then metal and slag are introduced into the vacuum vessel. After the degassed metal has been drained off, the slag remains as a viscous, protective coating on the lining of the vacuum chamber . Finally, the components of the cover layer can also be introduced separately into the vacuum vessel after the metal to be degassed has been filled in without slag.
Es empfiehlt sich, die Schutzschicht von Zeit zu Zeit, etwa nach jeder zehnten Vakuumbehandlung, in der beschriebenen Weise zu erneuern.It is best to remove the protective layer from time to time, about after each tenth vacuum treatment, to be renewed in the manner described.
Claims (2)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DED38284A DE1209930B (en) | 1962-03-03 | 1962-03-03 | Process for the protection of the refractory, for example made of magnesite bricks, lining of degassing vessels against liquid steel and slag |
| GB4256/63A GB962205A (en) | 1962-03-03 | 1963-02-01 | Improvements relating to refractory linings for chambers for degasifying metals |
| US261231A US3203785A (en) | 1962-03-03 | 1963-02-26 | Refractory linings for chambers for degasifying metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DED38284A DE1209930B (en) | 1962-03-03 | 1962-03-03 | Process for the protection of the refractory, for example made of magnesite bricks, lining of degassing vessels against liquid steel and slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1209930B true DE1209930B (en) | 1966-01-27 |
Family
ID=7044025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DED38284A Pending DE1209930B (en) | 1962-03-03 | 1962-03-03 | Process for the protection of the refractory, for example made of magnesite bricks, lining of degassing vessels against liquid steel and slag |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3203785A (en) |
| DE (1) | DE1209930B (en) |
| GB (1) | GB962205A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1046583A (en) * | 1964-03-04 | 1966-10-26 | Gen Motors Ltd | Furnaces for the heat treatment of particulate material |
| US3942293A (en) * | 1971-09-20 | 1976-03-09 | Ppg Industries, Inc. | Metal oxide coated refractory brick |
| US4117868A (en) * | 1975-02-13 | 1978-10-03 | United States Steel Corporation | Refractory lined cylindrical article |
| US4150182A (en) * | 1977-05-02 | 1979-04-17 | United States Steel Corporation | Method of producing a refractory lining in a cylinder or tube and resultant article |
| AT375400B (en) * | 1980-05-19 | 1984-07-25 | Vgini I P Rabot Ogneupornoj | PROTECTIVE LAYERING MASS FOR PROTECTING THE FEED OF IRON CABINETS AGAINST SLAG EFFECT AND MOELLER TO GENERATE SUCH A MASS |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1063954B (en) * | 1958-07-08 | 1959-08-20 | Chamotte Ind | Glaze for basic and acidic firebricks |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1198827A (en) * | 1915-09-21 | 1916-09-19 | Alfred Ernest Davies | Manufacture of steel by the basic open-hearth process. |
| US1663660A (en) * | 1924-12-08 | 1928-03-27 | Chicago Crucible Company | Refractory article and method of making same |
| US1789474A (en) * | 1929-10-24 | 1931-01-20 | Corundite Refractories Inc | Grooved refractory lining |
| US2177716A (en) * | 1937-10-29 | 1939-10-31 | Heuer Russell Pearce | Desulphurizing apparatus |
| US2631344A (en) * | 1950-10-14 | 1953-03-17 | Union Carbide & Carbon Corp | Method of casting metal ingots |
-
1962
- 1962-03-03 DE DED38284A patent/DE1209930B/en active Pending
-
1963
- 1963-02-01 GB GB4256/63A patent/GB962205A/en not_active Expired
- 1963-02-26 US US261231A patent/US3203785A/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1063954B (en) * | 1958-07-08 | 1959-08-20 | Chamotte Ind | Glaze for basic and acidic firebricks |
Also Published As
| Publication number | Publication date |
|---|---|
| US3203785A (en) | 1965-08-31 |
| GB962205A (en) | 1964-07-01 |
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