EP1222982B1 - Lining for ladles, tundishes and similar receptacles used in the iron and steel industry - Google Patents
Lining for ladles, tundishes and similar receptacles used in the iron and steel industry Download PDFInfo
- Publication number
- EP1222982B1 EP1222982B1 EP02000486A EP02000486A EP1222982B1 EP 1222982 B1 EP1222982 B1 EP 1222982B1 EP 02000486 A EP02000486 A EP 02000486A EP 02000486 A EP02000486 A EP 02000486A EP 1222982 B1 EP1222982 B1 EP 1222982B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- lining
- bricks
- binding material
- ladles
- 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
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
Definitions
- the present invention relates to one-piece lining for ladles, tundishes and similar receptacles used in iron and steel industry. It comprises one or more layers of refractory bricks, which are joined together on every contact surfaces with a low-expansion, heat resistant stucco, said stucco being treated with a carbon-based additive as the one described in the European patent No. 0505542.
- molten metal from the blast furnace is taken to steel meting shop where further reduction of impurities is done in converters.
- the liquid steel is taken into ladles and afterwards in other containers or tundishes.
- Ladles are metal receptacles lined with refractory bricks and a refractory wall, which is in contact with the molten metal and must be periodically replaced (rebricking).
- Tundishes are containers made of steel and lined with some brick layers coated with 3-4 cm, highly refractory materials.
- said receptacles and, in particular, ladles and buckets are subjected to oxidation of the metal sheets with the consequent reduction of the wall thickness; lastly, also the carbon-based bricks subjected to slags attack, are oxidized. With time and at a temperature ranging between 800°C and 1000°C, oxygen decarburises the bricks, lowering their mechanical resistance, and causing wear and carbon release in the produced steel.
- the invention solves the above mentioned problems being characterised as a one-piece lining comprising some layers of refractory bricks joined together with alumina- or zircon-based stuccos.
- These stuccos, treated with a carbon additive already described and claimed in the European patent No. 0505542, are thermal resistant and have a low coefficient of thermal expansion.
- Fig. 1 describes a practical, preferred but not restrictive example, how said coating can be applied to a ladle surface.
- the lining consists of a not penetrable wall pattern made of horizontal and vertical joints with suitable binding materials that makes a real barrier to the liquid steel.
- (1) is the ladle metal shell, on which a first 2-mm layer of protective, binding and insulating stucco (2) is applied.
- this material can be composed of aluminum silicate, sand and ceramic fibers.
- a first protective layer (3) made of slabs or bricks (flat or with a proper curvature) is laid on said stucco (2) and joined together with the alumina- and/or zirconium-based, low expansion stucco (5). Before the next protective layer is laid, a further layer of the material (5) is applied on the bricks surface.
- Said stucco layer must be applied gradually, on small portions of the wall (some square meters), to avoid its complete hardening before the bricks are laid down. Then, the bricks (4) are laid down, joined with the same material (5).
- the most important part of the coating is a layer (6) made of the very same material of the layer (5).
- Said layer which acts as a strong barrier to molten steel or cast iron infiltrations, can have a thickness of approximately 2 mm and must be applied on the whole surface; then it must dry completely (about 4-8 hours, according to the external temperature) before laying the final layer of the wall (7).
- said stuccos (5), (6) are additivated with an additive described in the European Patent 0505542.
- Said additive for bonding agents with insulating, impermeabilizing and antishrink properties comprising a mixture of carbonates which, expressed as their respective oxides, comprises in weight percentages, 0 to 1% Fe 2 O 3 , 65 to 80% CaO, 20 to 30% SiO 2 , 0 to 2% Al 2 O 3 and 0 to 1% MgO.
- the additivated stucco (5), (6) will be prepared in liquid form, mixing the components with an appropriate amount of water, so as to obtain a final mix in the form of a mortar; at least one resin selected from epoxy, acrylic, phenolic, polyurethane, or other resins known for uses with bonding agents will be added; then the composition will to be heated.
- the advantages of such coating system are: the reduction of infiltrations due to the stucco interlayers that cool down the molten steel which solidifies into thin sheets easily removable; reduction of maintenance time and longer lifetime of the refractory materials; reduction of ladles cracking and leakage; lower temperature of the shell external surface and, consequently, lower steel heat losses.
- the use of such insulating and heat resistant coating for such receptacles avoids the oxidation of the sheet metal walls, their thickness reduction and allows a lower carbon release in the produced steel, in particular if carbon bricks are used.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Ladders (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
- The present invention relates to one-piece lining for ladles, tundishes and similar receptacles used in iron and steel industry. It comprises one or more layers of refractory bricks, which are joined together on every contact surfaces with a low-expansion, heat resistant stucco, said stucco being treated with a carbon-based additive as the one described in the European patent No. 0505542.
- As known, steel production process comprises several phases: molten metal from the blast furnace is taken to steel meting shop where further reduction of impurities is done in converters. The liquid steel is taken into ladles and afterwards in other containers or tundishes. Ladles are metal receptacles lined with refractory bricks and a refractory wall, which is in contact with the molten metal and must be periodically replaced (rebricking). Tundishes are containers made of steel and lined with some brick layers coated with 3-4 cm, highly refractory materials.
- These containers have some drawbacks: steel infiltration into the refractory materials, persistent adhesion of steel to the ladles or buckets inner walls. Experts try to overcome these problems lining the ladles walls with special refractory bricks and binding materials, as described in the French Patent FR2296485. That lining comprises a layer of insulating material applied to the metal shell of the ladle, an intermediate layer of refractory material and a working layer. Moreover, in the Japanese Patent JP 63 119971, a lining for a ladle which comprises a heat insulating layer, two layers of lining brick and a working layer of bricks has been disclosed, but no mention how to build up the lining is available.
- Therefore, up to now nobody has effectively solved the problem. Moreover, said receptacles and, in particular, ladles and buckets are subjected to oxidation of the metal sheets with the consequent reduction of the wall thickness; lastly, also the carbon-based bricks subjected to slags attack, are oxidized. With time and at a temperature ranging between 800°C and 1000°C, oxygen decarburises the bricks, lowering their mechanical resistance, and causing wear and carbon release in the produced steel.
- The invention solves the above mentioned problems being characterised as a one-piece lining comprising some layers of refractory bricks joined together with alumina- or zircon-based stuccos. These stuccos, treated with a carbon additive already described and claimed in the European patent No. 0505542, are thermal resistant and have a low coefficient of thermal expansion.
- These and other advantages will be pointed out in the detailed description of the invention that will refer to the figures 1 and 2 of the tables 1/1. Both are examplifying and not restrictive.
- Fig. 1 describes a practical, preferred but not restrictive example, how said coating can be applied to a ladle surface.
- The lining consists of a not penetrable wall pattern made of horizontal and vertical joints with suitable binding materials that makes a real barrier to the liquid steel. In figure 1, (1) is the ladle metal shell, on which a first 2-mm layer of protective, binding and insulating stucco (2) is applied. According to a preferred embodiment, this material can be composed of aluminum silicate, sand and ceramic fibers. Afterwards, a first protective layer (3) made of slabs or bricks (flat or with a proper curvature) is laid on said stucco (2) and joined together with the alumina- and/or zirconium-based, low expansion stucco (5). Before the next protective layer is laid, a further layer of the material (5) is applied on the bricks surface. Said stucco layer must be applied gradually, on small portions of the wall (some square meters), to avoid its complete hardening before the bricks are laid down. Then, the bricks (4) are laid down, joined with the same material (5). The most important part of the coating is a layer (6) made of the very same material of the layer (5). Said layer, which acts as a strong barrier to molten steel or cast iron infiltrations, can have a thickness of approximately 2 mm and must be applied on the whole surface; then it must dry completely (about 4-8 hours, according to the external temperature) before laying the final layer of the wall (7).
- As already mentioned, said stuccos (5), (6) are additivated with an additive described in the European Patent 0505542. Said additive for bonding agents with insulating, impermeabilizing and antishrink properties, comprising a mixture of carbonates which, expressed as their respective oxides, comprises in weight percentages, 0 to 1% Fe2O3, 65 to 80% CaO, 20 to 30% SiO2, 0 to 2% Al2O3 and 0 to 1% MgO.
- The additivated stucco (5), (6) will be prepared in liquid form, mixing the components with an appropriate amount of water, so as to obtain a final mix in the form of a mortar; at least one resin selected from epoxy, acrylic, phenolic, polyurethane, or other resins known for uses with bonding agents will be added; then the composition will to be heated.
- Summarizing, the advantages of such coating system are: the reduction of infiltrations due to the stucco interlayers that cool down the molten steel which solidifies into thin sheets easily removable; reduction of maintenance time and longer lifetime of the refractory materials; reduction of ladles cracking and leakage; lower temperature of the shell external surface and, consequently, lower steel heat losses. Finally, the use of such insulating and heat resistant coating for such receptacles avoids the oxidation of the sheet metal walls, their thickness reduction and allows a lower carbon release in the produced steel, in particular if carbon bricks are used.
Claims (4)
- Process to build up a one-piece lining for ladles, tundishes and similar receptacles used in iron and steel industry, said lining consisting of one or more layers of refractory material, a working lining and several layers of alumina- and/or zirconium-based binding materials (5), (6), the binding material comprising an additive comprising a mixture of carbonates which, expressed as their respective oxides, comprises in weight percentages, 0 to 1% Fe2O3, 65 to 80% CaO, 20 to 30% SiO2, 0 to 2% Al2O3 and 0 to 1% MgO, the process comprising following steps:applying a first layer of protective, binding andinsulating stucco (2), based on ceramic or alumina fibers, on the ladle metal shell (1);laying a first protective layer (3) made of slabs or bricks, flat or with a proper curvature, joined together with the binding material (5), on said stucco (2);applying a layer of the binding material (5) on the bricks surface, gradually, on small portions of the wall to avoid its complete hardening before the bricks of the next protective layer are laid down;laying the bricks of a further protective layer (4), joined with the same binding material (5);applying a layer (6), made of the very same binding material as the layer (5) on the whole surface;drying layer (6) completely;applying the bricks of the final layer of the wall (7).
- Lining for ladles, tundishes and similar receptacles used in the iron and steel industry, obtainable by the process according to the claim 1, consisting of:a first layer of protective and insulating material (2), approximately 2-mm thick, based on ceramic or alumina fibers, applied on the ladles metal sheets (1) as a binding stucco;a first protective brick layer (3), laid on the said material (2) and joined together by a material (5);a layer of the same binding material (5), approximately 2-mm thick, applied as a binding stucco on the first layer of bricks;a further protective brick layer (4), joined with the same binding material (5);a layer (6) made of the same binding material as the layer (5);a final working lining (7), wherein the binding material (5), (6) is alumina- and/or zirconium-based binding material comprising comprising an additive comprising a mixture of carbonates which, expressed as their respective oxides, comprises in weight percentages, 0 to 1% Fe2O3, 65 to 80% CaO, 20 to 30% SiO2, 0 to 2% Al2O3 and 0 to 1% MgO.
- Lining according to the claim 2, characterized by the fact that said materials of layers (5), (6) containing alumina, zirconium silicate and/or other alkaline or acid elements.
- Lining according to the claim 2 or 3, characterized by the fact that said materials of layers (5), (6) present heat resistance up to 1700 °C.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBA010004 | 2001-01-16 | ||
IT2001BA000004A ITBA20010004A1 (en) | 2001-01-16 | 2001-01-16 | MONOBLOCK COATING FOR LADDERS, BASKETS AND SIMILAR CONTAINERS USED IN THE STEEL INDUSTRY. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1222982A2 EP1222982A2 (en) | 2002-07-17 |
EP1222982A3 EP1222982A3 (en) | 2003-07-16 |
EP1222982B1 true EP1222982B1 (en) | 2005-04-20 |
Family
ID=11437719
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02000486A Expired - Lifetime EP1222982B1 (en) | 2001-01-16 | 2002-01-08 | Lining for ladles, tundishes and similar receptacles used in the iron and steel industry |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1222982B1 (en) |
AT (1) | ATE293504T1 (en) |
DE (1) | DE60203744T2 (en) |
ES (1) | ES2240577T3 (en) |
IT (1) | ITBA20010004A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107427904A (en) * | 2015-03-24 | 2017-12-01 | 维苏威坩埚公司 | The metallurgical tank lining of perforation structure with configuration |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20050038442A (en) * | 2003-10-22 | 2005-04-27 | 삼성광주전자 주식회사 | Floor nozzle for vacuum cleaner |
CN103464735B (en) * | 2013-09-29 | 2016-03-30 | 武汉钢铁集团耐火材料有限责任公司 | Improve the method and high life low material consumption smelting ladle thereof of smelting ladle service efficiency |
WO2015043452A1 (en) * | 2013-09-29 | 2015-04-02 | 武汉钢铁(集团)公司 | Method for improving use efficiency of smelting ladle, and smelting ladle of long service life and low material consumption |
CN112264612B (en) * | 2020-09-30 | 2022-01-18 | 江苏沙钢集团有限公司 | Steel ladle masonry structure and steel ladle using method |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3528647A (en) * | 1968-12-13 | 1970-09-15 | Koppers Co Inc | Insulating structure for use between the steel shell and the internal refractory lining in a metallurgical furnace |
LU71573A1 (en) * | 1974-12-30 | 1976-11-11 | ||
JPS63119971A (en) * | 1986-11-05 | 1988-05-24 | Kobe Steel Ltd | Brick structure around nozzle part of ladle for molten steel |
JPH01289564A (en) * | 1988-05-13 | 1989-11-21 | Aichi Steel Works Ltd | Ladle for molten steel |
DD282635A5 (en) * | 1989-04-28 | 1990-09-19 | Bandstahlkombinat Matern Veb | FIRE-RESISTANT FODDER ASSEMBLY FOR METALLURGICAL GEFAESSE |
IT1243637B (en) * | 1990-10-17 | 1994-06-16 | Somergom Srl | POWDER ADDITIVE FOR SCREEDS, PLASTERS, CONCRETE AND PREFABRICATED IN GENERAL WITH PROPERTIES INSULATING AND WATERPROOFING AND WITH ANTI-WITHDRAWAL FEATURES. |
DE4142029C2 (en) * | 1991-12-19 | 1994-06-16 | Didier Werke Ag | Steel ladle |
JPH05296667A (en) * | 1992-04-17 | 1993-11-09 | Nippon Steel Corp | Construction structure of container for molten metal |
-
2001
- 2001-01-16 IT IT2001BA000004A patent/ITBA20010004A1/en unknown
-
2002
- 2002-01-08 ES ES02000486T patent/ES2240577T3/en not_active Expired - Lifetime
- 2002-01-08 DE DE60203744T patent/DE60203744T2/en not_active Expired - Fee Related
- 2002-01-08 EP EP02000486A patent/EP1222982B1/en not_active Expired - Lifetime
- 2002-01-08 AT AT02000486T patent/ATE293504T1/en not_active IP Right Cessation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107427904A (en) * | 2015-03-24 | 2017-12-01 | 维苏威坩埚公司 | The metallurgical tank lining of perforation structure with configuration |
CN107427904B (en) * | 2015-03-24 | 2019-04-26 | 维苏威美国公司 | The metallurgical tank lining of perforation structure with configuration |
US10507523B2 (en) | 2015-03-24 | 2019-12-17 | Vesuvius Usa Corporation | Metallurgical vessel lining with configured perforation structure |
Also Published As
Publication number | Publication date |
---|---|
DE60203744D1 (en) | 2005-05-25 |
ATE293504T1 (en) | 2005-05-15 |
EP1222982A3 (en) | 2003-07-16 |
ITBA20010004A1 (en) | 2002-07-16 |
DE60203744T2 (en) | 2006-03-02 |
ES2240577T3 (en) | 2005-10-16 |
EP1222982A2 (en) | 2002-07-17 |
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