CN114905033A - Hot metal ladle structure with heating function - Google Patents
Hot metal ladle structure with heating function Download PDFInfo
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- CN114905033A CN114905033A CN202210553513.XA CN202210553513A CN114905033A CN 114905033 A CN114905033 A CN 114905033A CN 202210553513 A CN202210553513 A CN 202210553513A CN 114905033 A CN114905033 A CN 114905033A
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- Prior art keywords
- layer
- permanent
- working
- refractory
- casting material
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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)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
A hot metal ladle structure with heating function is mainly composed of a ladle straight body, a ladle bottom, a permanent heat preservation layer, a permanent refractory brick layer, a refractory working layer, a molten iron cavity, a ladle edge casting material layer at the upper end of the ladle straight body, a working slag line brick layer between the ladle edge casting material layer and the permanent refractory brick layer, a permanent casting material layer at the ladle bottom and a working casting material layer in sequence from the inner wall of the ladle straight body on the inner wall of the ladle straight body, wherein an air brick is arranged in the working casting material layer; 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 casting material layer is U-shaped, and the height direction of the U-shaped refractory material layer and the refractory working layer have 1-2 rings of refractory brick overlapping height. The hot metal tank is additionally heated and stirred, so that 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 reaches more than 600 furnaces.
Description
Technical Field
The invention relates to a hot-metal bottle for steel making, in particular to a hot-metal bottle structure with a heating function.
Background
The hot metal ladle is a molten iron receiving, conveying and desulfurizing pretreatment device widely adopted by steel mills, and is also an important carrier of an iron-steel interface, and the operational stability of the hot metal ladle directly influences technical and economic indexes such as material consumption, energy consumption and the like of the hot metal pretreatment and converter steelmaking process.
The waste steel resources are digested and recycled in the smelting engineering, so that the recycling of the resources is facilitated, the survival and the benefit of iron and steel enterprises are facilitated, and the dependence on iron ores is reduced. The ratio of scrap steel in the whole process is continuously improved in the modern steel-making process, and the process of increasing the addition of the scrap steel in a hot metal ladle by utilizing the surplus heat of a furnace lining or the temperature of molten iron is a process commonly adopted by various steel plants, but the temperature of the molten iron can be obviously reduced, the phenomena of reduction of the fluidity of the molten iron, incomplete melting of the scrap steel and the like occur, so that the completion of the processes of desulfurization pretreatment of the molten iron, subsequent blowing in a converter and the like is influenced.
The addition of the scrap steel not only needs scientific calculation of the heat balance of the upper and lower working procedures, but also changes the use conditions of the hot metal ladle. The original molten iron tank is only used as a container for transferring and pretreating molten iron, and the material, structure and function of a furnace lining cannot meet the requirements of processes such as heating and stirring of an LF furnace. Because the temperature of molten iron 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%. The method is an innovative process for heating the molten iron in the molten iron tank by using heating equipment and means such as electrodes of an LF furnace and resistance wire heating of an electric furnace and then entering a subsequent process. The method not only can improve the temperature of the molten iron and increase the adding amount of the scrap steel, but also can increase the stirring function of the molten iron tank, uniformly mix the components and the temperature of the molten iron, increase the adding means of metallurgical furnace burden and improve the efficiency of the processes such as desulfurization and the like.
Disclosure of Invention
The invention aims to overcome the defects caused by increasing the amount of scrap steel in the prior art, and provides the hot-metal ladle structure with the heating function, which can ensure that the scrap steel can be completely melted and has stable technological performance by improving the hot-metal ladle structure under the condition of meeting the requirement of increasing the amount of the scrap steel.
The measures for realizing the aim are as follows:
the utility model provides a take hot metal bottle structure of heating function, mainly by the straight body of jar, with the tank bottoms of the straight body coupling of jar, jar on the straight body inner wall of jar permanent heat preservation, permanent firebrick layer, fire-resistant working layer, molten iron chamber, jar that the straight body upper end of jar was in proper order along the pouring bed of material, jar along the pouring bed of material and the permanent pouring bed of material and the work pouring bed of material of work slag line brick layer between the permanent firebrick layer, tank bottoms constitute, it lies in: the working casting material layer is provided with air bricks, the permanent casting material layer is provided with air pipes, and the air pipes are communicated with holes on the air bricks; 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 working casting material layer is U-shaped, and the height direction of the U-shaped working casting material layer and the refractory working layer have 1-2 rings of refractory brick overlapping height.
It is characterized in 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.
It is characterized in that: 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 flow meter.
It is characterized in that: the volume density of the castable of the permanent castable layer and the material of the permanent heat-insulating layer is 1.8-2.5 g/cm 3 The heat conductivity coefficient 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 900 ℃.
It is characterized in that: the strength of the working castable layer is not lower than 70 MPa.
It is characterized in that: before the electric heater is started, a layer of aluminum-silicon-carbon protective coating is sprayed on the working slag line brick layer.
It is characterized in that: the refractory working layer is made of aluminum silicon carbide carbon bricks with the sum of SiC and C being more than or equal to 15%; the brick layer of the working slag line adopts alumina-magnesia-carbon bricks with the C being more than or equal to 12 percent.
Action and mechanism of the main components of the invention
The invention is characterized in that the air brick is arranged on the working casting material layer, the air pipe is arranged on the permanent casting material layer and is communicated with the hole on the air brick, and external air can be smoothly blown into the molten iron tank 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 to raise the temperature.
The invention ensures that the permanent casting material layer is U-shaped, and reduces the risk of accidents caused by molten iron permeating from a bottom gap due to the fact that the integrity of a furnace bottom structure is ensured.
The working casting material layer is U-shaped, the height direction of the U-shaped working casting material layer and the fireproof working layer have 1-2 rings of fireproof bricks, and the corrosion speed of the bottom area in the height direction is higher after the scrap steel is added, so that the working casting material layer further plays a role in protecting the fireproof working layer, and the service life of the weak part of the molten iron tank is prolonged.
The invention enables the overlapping height of the U-shaped permanent casting material layer and the refractory working layer in the height direction to be 2.5-3 rings of refractory bricks, and the invention ensures the integrity of the furnace bottom structure and reduces the risk of accidents caused by molten iron permeation after the working layer of the weak part at the bottom of the molten iron tank is damaged.
The volume density of the castable for limiting the permanent castable layer and the material for the permanent heat-insulating 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 ℃, because the safety of the hot-metal ladle in use is ensured while the heat-insulating performance of the permanent layer material is improved.
The invention limits the refractory working layer to adopt the aluminum silicon carbide carbon brick with the SiC and the C being more than or equal to 15 percent; the working slag line brick layer adopts the alumina-magnesia-carbon brick with the C being more than or equal to 12 percent, because the temperature of molten iron in the molten iron tank is lower than that of the molten steel, but the slag line erosion speed under the heating condition is highest, the brick selected for the working slag line brick layer is different from the refractory brick selected for the refractory working layer, the cost of materials can be controlled, and the whole service life can be prolonged.
Compared with the prior art, the hot-metal ladle has the advantages that the hot-metal ladle is added with the heating and stirring functions, so that the overall service life can reach more than 600 furnaces.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1-straight body of jar, 2-jar bottom, 3-permanent heat preservation layer, 4-permanent fire brick layer, 5-fire-resistant working layer, 6-molten iron chamber, 7-jar edge castable layer, 8-working slag line brick layer, 9-permanent castable layer, 10-working castable layer, 11-air brick, 12-air pipe, 13-electric heater, 14-connecting pipe, 15-regulating valve, 16-flowmeter, 17-aluminum silicon carbon protective coating layer.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
a hot metal ladle structure with heating function, mainly by the straight body of the jar 1, the jar bottom 2 connected with straight body of the jar 1, the inner wall of straight body of the jar 1 is from the permanent heat preservation 3 of the straight body inner wall of the jar in proper order, the permanent refractory brick layer 4, the refractory working layer 5, the molten iron cavity 6, the jar of straight body 1 upper end is along the pouring bed of material 7, the jar is along the working slag line brick layer 8 between pouring bed of material 7 and the permanent refractory brick layer 4, the permanent pouring bed of material 9 and the working pouring bed of material 10 of the jar bottom 2 make up, it is equipped with the air brick 11 in the working pouring bed of material 10, is equipped with the air pipe 12 in the permanent pouring bed of material 9, the air pipe 12 communicates with hole on 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 connected with the permanent heat-insulating layer 3 and the permanent refractory brick layer 4 in a sticking way; the working castable layer 10 is U-shaped, and the height direction of the U-shape and the refractory working layer 5 have 1-2 rings of refractory brick overlapping height.
The overlapping height of the U-shaped permanent castable layer 9 and the refractory working layer 5 in the height direction is 2.5-3 rings of refractory bricks.
The gas pipe 12 is connected with an external inert gas source through a connecting pipe 14, and a regulating valve 15 and a flow meter 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-insulating layer 3 is 1.8-2.5 g/cm 3 The heat conductivity coefficient is less than or equal to 0.9 w/m.k, and the fire-resistant temperature of the permanent heat-insulating layer 3 is not lower than 900 ℃.
The strength of the working castable layer 10 is not lower than 70 MPa.
Before the electric heater 13 is started, a layer of aluminum-silicon-carbon protective coating 17 is sprayed on the working slag line brick layer 8.
The refractory working layer 5 is made of aluminum silicon carbide carbon bricks with SiC and C being more than or equal to 15 percent; the working slag line brick layer 8 is made of alumina-magnesia-carbon bricks with the C being more than or equal to 12 percent.
The present embodiments are merely preferred examples, and are not intended to limit the scope of the present invention.
Claims (7)
1. The utility model provides a take hot metal bottle structure of heating function, mainly by the straight body of jar, with the tank bottoms of the straight body coupling of jar, jar on the straight internal wall of body permanent heat preservation, permanent firebrick layer, the fire-resistant working layer, molten iron chamber, jar that the straight body upper end of jar was in proper order along the pouring bed of material, jar along the pouring bed of material and the permanent pouring bed of material and the work pouring bed of material of work slag line brick layer between the permanent firebrick layer, tank bottoms constitute its characterized in that: the working casting material layer is provided with air bricks, the permanent casting material layer is provided with air pipes, and the air pipes are communicated with holes on the air bricks; 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 casting material layer is U-shaped, and the height direction of the U-shaped refractory material layer and the refractory working layer have 1-2 rings of refractory brick overlapping height.
2. The hot-metal ladle structure with the heating function as claimed in claim 1, wherein: 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.
3. The hot-metal ladle structure with the heating function as claimed 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 flow meter.
4. The hot-metal ladle structure with the heating function as claimed in claim 1, wherein: the volume density of the castable of the permanent castable layer and the material of the permanent heat-insulating layer is 1.8-2.5 g/cm 3 The heat conductivity coefficient 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 900 ℃.
5. The hot-metal ladle structure with the heating function as claimed in claim 1, wherein: the strength of the working castable layer is not lower than 70 MPa.
6. The hot-metal ladle structure with the heating function as claimed in claim 1, wherein: before the electric heater is started, a layer of aluminum-silicon-carbon protective coating is sprayed on the working slag line brick layer.
7. The hot-metal ladle structure with the heating function of claim 1, wherein: the refractory working layer is made of an aluminum silicon carbide carbon brick with the sum of SiC and C being more than or equal to 15%; the working slag line brick layer adopts alumina-magnesia-carbon bricks with the C content more than or equal to 12 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 |
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| 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 true CN114905033A (en) | 2022-08-16 |
| CN114905033B CN114905033B (en) | 2023-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210553513.XA Active CN114905033B (en) | 2022-05-20 | 2022-05-20 | Hot-metal bottle structure with heating function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (8)
| 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 |
| CN201644776U (en) * | 2010-04-06 | 2010-11-24 | 武汉科技大学 | A Ladle Lining Based on Gradient Thermal Insulation |
| JP4773569B1 (en) * | 2010-03-05 | 2011-09-14 | 東京窯業株式会社 | MgO-C quality brick for ladle lining |
| CN103464735A (en) * | 2013-09-29 | 2013-12-25 | 武汉钢铁(集团)公司 | Method for improving use efficiency of smelting ladle and smelting ladle with high service life and low material consumption |
| 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 |
| 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 |
| 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 |
-
2022
- 2022-05-20 CN CN202210553513.XA patent/CN114905033B/en active Active
Patent Citations (8)
| 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 | A Ladle Lining Based on Gradient Thermal Insulation |
| CN103464735A (en) * | 2013-09-29 | 2013-12-25 | 武汉钢铁(集团)公司 | Method for improving use efficiency of smelting ladle and smelting ladle with high service life and low material consumption |
| 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 |
| 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 |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 | Publication date |
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| CN114905033B (en) | 2023-06-09 |
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