CN114905033B - Hot-metal bottle structure with heating function - Google Patents
Hot-metal bottle structure with heating function Download PDFInfo
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- CN114905033B CN114905033B CN202210553513.XA CN202210553513A CN114905033B CN 114905033 B CN114905033 B CN 114905033B CN 202210553513 A CN202210553513 A CN 202210553513A CN 114905033 B CN114905033 B CN 114905033B
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- 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
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
- B22D41/01—Heating means
- B22D41/015—Heating means with external heating, i.e. the heat source not being a part of the ladle
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- 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
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- 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
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- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The hot-metal ladle structure with heating function mainly comprises a straight tank body, a tank bottom, a permanent heat-insulating layer, a permanent refractory brick layer, a refractory working layer, an iron water cavity, a tank edge pouring material layer at the upper end of the straight tank body, a working slag line brick layer between the tank edge pouring material layer and the permanent refractory brick layer, a permanent pouring material layer at the tank bottom and a working pouring material layer, wherein an air brick is arranged in the working pouring material layer, an air pipe is arranged in the permanent pouring material layer, and the air pipe is communicated with holes in the air brick; an electric heater is arranged in the molten iron cavity; the permanent casting material layer is U-shaped, and the top end of the permanent casting material layer is connected with the permanent heat-insulating layer and the permanent refractory brick layer; the shape of the working pouring material layer is U-shaped, and the height direction of the U-shape is 1-2 rings of refractory bricks overlapped with the refractory working layer. According to the invention, as the hot-metal ladle is added with heating and stirring, the scrap steel is completely melted under the condition of meeting the requirement of large scrap steel amount, the process performance is stable, and the whole service life is up to more than 600 furnaces.
Description
Technical Field
The invention relates to a hot-metal ladle for steel making, in particular to a hot-metal ladle structure with a heating function.
Background
The hot metal ladle is a widely adopted molten iron receiving, conveying and desulfurizing pretreatment device in a steel mill, is also an important carrier of an iron-steel interface, and the running stability of the hot metal ladle directly influences the technical and economic indexes such as material consumption, energy consumption and the like in the molten iron pretreatment and converter steelmaking process.
The recycled scrap steel resources are digested and utilized in the smelting engineering, so that the recycling of the resources is facilitated, the survival and benefits of iron and steel enterprises are facilitated, and the dependence on iron ores is reduced. In the modern steelmaking process, the whole flow scrap steel ratio is continuously improved, and the scrap steel adding amount of the hot metal ladle is increased by using the surplus heat of the temperature of a furnace lining or molten iron, so that the temperature of the molten iron is obviously reduced, the phenomenon that the fluidity of the molten iron is reduced, the scrap steel cannot be completely melted and the like is caused, and the desulfurization pretreatment of the molten iron and the completion of the subsequent processes of blowing into a converter and the like are influenced.
The addition of the scrap steel not only needs to scientifically calculate the heat balance of the upper working procedure and the lower working procedure, but also changes the using condition of the hot-metal ladle. The raw hot-metal ladle is only used as a container for transferring and preprocessing molten iron, and the material, structure and function of a furnace lining cannot meet the requirements of the processes such as heating and stirring of the upper LF furnace. Because the molten iron temperature is lower, the heated scrap steel is not easy to be completely melted, and the subsequent process is greatly influenced, the adding amount of the scrap steel is greatly limited, and the adding amount of the scrap steel under the condition of no preheating is generally not higher than 5 percent. The method uses heating equipment such as an electrode of an LF furnace, a resistance wire of an electric furnace and the like to heat molten iron in a molten iron tank, and then enters a subsequent process, thus being an innovative process. Not only can the temperature of molten iron be increased, the addition amount of scrap steel be increased, but also the stirring function of a molten iron tank can be increased, the components and the temperature of molten iron can be mixed uniformly, the adding means of metallurgical furnace burden can be increased, and the efficiency of the desulfurization and other processes can be improved.
Disclosure of Invention
The invention aims to overcome the defects brought by increasing the amount of scrap steel in the prior art, and provides the hot-metal ladle structure with the heating function, which can not only completely melt the scrap steel, but also has stable technological performance through improving the hot-metal ladle structure under the condition of increasing the amount of scrap steel.
Measures for achieving the above object:
the utility model provides a take hot-metal bottle structure of heating function, mainly by jar straight body, with jar bottom of jar straight body coupling, jar straight body on the inner wall from jar straight body inner wall permanent heat preservation, permanent firebrick layer, refractory working layer, iron water cavity in proper order, jar along pouring material layer and the permanent firebrick layer between the work slag line brick layer of pouring material layer, jar bottom permanently pouring material layer and work pouring material layer of jar straight body upper end constitute, its characterized in that: the work castable layer is internally provided with an air brick, the permanent castable layer is provided with an air pipe, and the air pipe is communicated with holes on the air brick; an electric heater is arranged in the molten iron cavity; the permanent casting material layer is U-shaped, and the top end of the permanent casting material layer is connected with the permanent heat-insulating layer and the permanent refractory brick layer; the shape of the working pouring material layer is U-shaped, and the height direction of the U-shape is 1-2 rings of refractory bricks overlapped with the refractory working layer.
The method comprises the following steps: the overlapping height of the U-shaped permanent casting material layer and the refractory working layer in the height direction is 2.5-3 rings of refractory bricks.
The method comprises the following steps: the gas pipe is connected with an external inert gas source through a connecting pipe, and the connecting pipe is provided with a regulating valve and a flowmeter.
The method comprises the following steps: the volume density of the castable of the permanent castable layer and the material of the permanent heat insulation layer is 1.8-2.5 g/cm 3 The heat conductivity coefficient of the semi-heavy castable is less than or equal to 0.9 w/m.k, and the refractory temperature of the permanent heat insulation layer is not lower than 900 ℃.
The method comprises the following steps: the strength of the working castable layer is not lower than 70 MPa.
The method comprises the following steps: before the electric heater is started, a layer of aluminum-silicon-carbon protective paint is sprayed on the working slag line brick layer.
The method comprises the following steps: the refractory working layer adopts aluminum silicon carbide carbon bricks with the sum of SiC and C being more than or equal to 15 percent; the working slag line brick layer adopts an aluminum magnesia carbon brick with C more than or equal to 12 percent.
The action and mechanism of the main components in the invention
According to the invention, the air brick is arranged on the working pouring material layer, the air pipe is arranged on the permanent pouring material layer, and the air pipe is communicated with the hole on the air brick, so that external air can be ensured to be smoothly blown into the hot metal ladle through the pipeline and the air brick.
The electric heater is arranged in the molten iron cavity, and the molten iron in the molten iron tank is heated by an external heating means.
The permanent castable layer is U-shaped, so that the integrity of the hearth structure is ensured, and the risk of accidents caused by infiltration of molten iron from a bottom gap is reduced.
The invention makes the shape of the working pouring material layer be U-shaped, and the U-shaped height direction and the refractory working layer have 1-2 rings of refractory bricks overlapped height, because the erosion speed of the bottom area in the height direction is faster after the scrap steel is added, the working pouring material layer further protects the refractory working layer, and the service life of the weak part of the hot metal ladle is prolonged.
The invention ensures that the overlapping height of the U-shaped permanent castable layer and the refractory working layer in the height direction is 2.5-3 rings of refractory bricks, and reduces the risk of accidents caused by molten iron infiltration after the working layer at the weak part at the bottom of the hot metal ladle is damaged due to the integrity of the furnace bottom structure.
The volume density of the castable for limiting the permanent castable layer and the material for the permanent heat insulation layer is 1.8-2.5 g/cm 3 The heat conductivity coefficient of the semi-heavy castable is less than or equal to 0.9 w/m.k, and the fire-resistant temperature of the permanent heat-insulating layer is not lower than 1500 ℃, so that the use safety of the hot metal ladle is ensured while the heat-insulating property of the permanent layer material is improved.
The refractory working layer is defined by adopting an aluminum silicon carbide carbon brick with SiC+C being more than or equal to 15 percent; the working slag line brick layer adopts aluminum magnesia carbon bricks with C more than or equal to 12 percent, and because the temperature of molten iron in a hot metal ladle is lower than that of molten steel, but the slag line erosion speed is highest under the heating condition, the brick selected by the working slag line brick layer is different from the refractory brick selected by a refractory working layer, and the cost and the overall service life of materials can be controlled.
Compared with the prior art, the hot-metal ladle has the advantages that the hot-metal ladle has the heating and stirring functions, and the whole service life can reach more than 600 furnaces.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
in the figure: 1-a tank straight body, 2-a tank bottom, 3-a permanent heat preservation layer, 4-a permanent refractory brick layer, 5-a refractory working layer, 6-an iron water cavity, 7-a tank edge castable layer, 8-a working slag line brick layer, 9-a permanent castable layer, 10-a working castable layer, 11-an air brick, 12-a gas pipe, 13-an electric heater, 14-a connecting pipe, 15-a regulating valve, 16-a flowmeter and 17-an aluminum silicon carbon protective coating layer.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
the hot-metal ladle structure with the heating function mainly comprises a ladle straight body 1, a ladle bottom 2 connected with the ladle straight body 1, a permanent heat insulation layer 3, a permanent refractory brick layer 4, a refractory working layer 5, a molten iron cavity 6, a ladle edge pouring material layer 7 at the upper end of the ladle straight body 1, a working slag line brick layer 8 between the ladle edge pouring material layer 7 and the permanent refractory brick layer 4, a permanent pouring material layer 9 of the ladle bottom 2 and a working pouring material layer 10, wherein an air brick 11 is arranged in the working pouring material layer 10, a gas pipe 12 is arranged in the permanent pouring material layer 9, and the gas pipe 12 is communicated with holes in the air brick 11; an electric heater 13 is arranged in the molten iron cavity 6; the permanent casting material layer 9 is U-shaped, and the top end of the permanent casting material layer is in adhesive connection with the permanent heat preservation layer 3 and the permanent refractory brick layer 4; the working castable layer 10 is U-shaped, and the height direction of the U-shape is 1-2 rings of refractory bricks overlapped with the refractory working layer 5.
The U-shaped permanent casting material layer 9 and the fireproof working layer 5 are overlapped in the height direction to form 2.5-3 rings of fireproof bricks.
The gas pipe 12 is connected with an external inert gas source through a connecting pipe 14, and an adjusting valve 15 and a flowmeter 16 are arranged on the connecting pipe 14.
The volume density of the castable of the U-shaped permanent castable layer 9 and the material of the permanent heat insulation layer 3 is 1.8-2.5 g/cm 3 The heat conductivity coefficient of the semi-heavy castable is less than or equal to 0.9 w/m.k, and the refractory temperature of the permanent heat insulation layer 3 is not lower than 900 ℃.
The strength of the working castable layer 10 is not lower than 70MPa, and the working castable layer is made of aluminum silicon carbide carbonaceous heavy castable.
Before the electric heater 13 is started, a layer of aluminum-silicon-carbon protective paint 17 is sprayed on the working slag line brick layer 8.
The fireproof working layer 5 is made of aluminum silicon carbide carbon bricks with SiC+C more than or equal to 15 percent; the working slag line brick layer 8 is made of aluminum magnesia carbon bricks with C more than or equal to 12 percent.
This embodiment is merely a best example and is not intended to limit the implementation of the technical solution of the present invention.
Claims (7)
1. The utility model provides a take hot-metal bottle structure of heating function, mainly by jar straight body, with jar bottom of jar straight body coupling, jar straight body on the inner wall from jar straight body inner wall permanent heat preservation, permanent firebrick layer, refractory working layer, iron water cavity in proper order, jar along pouring material layer and the permanent firebrick layer between the work slag line brick layer of pouring material layer, jar bottom permanently pouring material layer and work pouring material layer constitute its characterized in that: the work castable layer is internally provided with an air brick, the permanent castable layer is provided with an air pipe, and the air pipe is communicated with holes on the air brick; an electric heater is arranged in the molten iron cavity; the permanent casting material layer is U-shaped, and the top end of the permanent casting material layer is connected with the permanent heat-insulating layer and the permanent refractory brick layer; the shape of the working pouring material layer is U-shaped, and the height direction of the U-shape is 1-2 rings of refractory bricks overlapped with the refractory working layer.
2. The hot-metal bottle structure with heating function as set forth in claim 1, wherein: the overlapping height of the U-shaped permanent casting material layer and the refractory working layer in the height direction is 2.5-3 rings of refractory bricks.
3. The hot-metal bottle structure with heating function as set forth in claim 1, wherein: the gas pipe is connected with an external inert gas source through a connecting pipe, and the connecting pipe is provided with a regulating valve and a flowmeter.
4. The hot-metal bottle structure with heating function as set forth in claim 1, wherein: the castable of the permanent castable layer and the material of the permanent heat insulation layer areThe volume density is 1.8-2.5 g/cm 3 The heat conductivity coefficient of the semi-heavy castable is less than or equal to 0.9 w/m.k, and the refractory temperature of the permanent heat insulation layer is not lower than 900 ℃.
5. The hot-metal bottle structure with heating function as set forth in claim 1, wherein: the strength of the working castable layer is not lower than 70MPa of aluminum silicon carbide carbonaceous heavy castable.
6. The hot-metal bottle structure with heating function as set forth in claim 1, wherein: before the electric heater is started, a layer of aluminum-silicon-carbon protective paint is sprayed on the working slag line brick layer.
7. The hot-metal bottle structure with heating function of claim 1, wherein: the refractory working layer adopts aluminum silicon carbide carbon bricks with the sum of SiC and C being more than or equal to 15 wt%; the working slag line brick layer adopts an aluminum magnesia carbon brick with the C more than or equal to 12 weight percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210553513.XA CN114905033B (en) | 2022-05-20 | 2022-05-20 | Hot-metal bottle structure with heating function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210553513.XA CN114905033B (en) | 2022-05-20 | 2022-05-20 | Hot-metal bottle structure with heating function |
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| Publication Number | Publication Date |
|---|---|
| CN114905033A CN114905033A (en) | 2022-08-16 |
| CN114905033B true CN114905033B (en) | 2023-06-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115415510A (en) * | 2022-09-16 | 2022-12-02 | 包头钢铁（集团）有限责任公司 | Steel ladle bottom and building method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201423442Y (en) * | 2009-05-06 | 2010-03-17 | 鞍山市量子炉材集团有限公司 | Compound safety ladle lining |
| JP4773569B1 (en) * | 2010-03-05 | 2011-09-14 | 東京窯業株式会社 | MgO-C quality brick for ladle lining |
| CN201644776U (en) * | 2010-04-06 | 2010-11-24 | 武汉科技大学 | Steel ladle lining based on gradient heat insulation |
| 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 |
| CN205888058U (en) * | 2016-08-19 | 2017-01-18 | 郑州市瑞沃耐火材料有限公司 | Compound masonry construction of steel ladle lining |
| CN205888059U (en) * | 2016-08-19 | 2017-01-18 | 郑州市瑞沃耐火材料有限公司 | Hot metal bottle is built by laying bricks or stones to blast furnace |
| CN212682432U (en) * | 2020-06-01 | 2021-03-12 | 西峡县泰祥实业有限公司 | Water atomization alloy powder tundish |
| CN214458140U (en) * | 2021-03-12 | 2021-10-22 | 武汉钢铁有限公司 | Converter bottom structure |
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| CN114905033A (en) | 2022-08-16 |
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