CN112626314A - Technological method for preventing steel ladle bottom blowing steel leakage - Google Patents
Technological method for preventing steel ladle bottom blowing steel leakage Download PDFInfo
- Publication number
- CN112626314A CN112626314A CN202011464118.1A CN202011464118A CN112626314A CN 112626314 A CN112626314 A CN 112626314A CN 202011464118 A CN202011464118 A CN 202011464118A CN 112626314 A CN112626314 A CN 112626314A
- Authority
- CN
- China
- Prior art keywords
- brick
- blowing
- preventing
- steel
- air
- 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
Images
Classifications
-
- 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
-
- 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
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a process method for preventing steel ladle bottom from leaking steel, which comprises the following steps: obtaining the size of the bottom blowing brick core, and enabling the product to be offline when the size of the bottom blowing brick core is smaller than a preset size; acquiring the oxygen content in the back-blowing gas, and sending an alarm signal when the oxygen content exceeds a preset oxygen content value; the air brick with the cushion brick structure is used, and fire clay is smeared at the front end and the periphery of the cushion brick so as to seal a hole at the lower part of the air brick core; when the air brick is replaced, the residual brick is pulled out by adopting a pulling mechanism. The safe operation of the position of the air brick at the bottom of the ladle can be ensured, thereby realizing the purpose of preventing the steel ladle from bottom blowing bleed-out and solving the technical problem of bleed-out caused by the consumption of the air brick in the prior art.
Description
Technical Field
The invention relates to the technical field of steel making, in particular to a process method for preventing steel ladle bottom blowing from leaking steel.
Background
The air brick plays an important role in the refining process of molten steel. By stirring the molten steel, the method achieves the aims of quickly dispersing, promoting the melting of alloy, deoxidizing agent, desulfurizing agent and the like added into the molten steel, promoting the removal of gas and non-metallic inclusions in the steel, has the function of homogenizing the temperature and components of the molten steel, cleans the molten steel, improves the quality of the steel and further achieves the refining aim. The air brick as a refractory product can be consumed and damaged in the use process, and if the use method cannot be correctly controlled, normal production can be influenced, and even serious production accidents such as steel leakage and the like can be caused.
Disclosure of Invention
The invention aims to provide a process method for preventing steel ladle bottom blowing steel leakage, which aims to solve the technical problem of steel leakage caused by consumption of air bricks in the prior art.
The invention provides a process method for preventing steel ladle bottom from leaking steel, which comprises the following steps:
obtaining the size of the bottom blowing brick core, and enabling the product to be offline when the size of the bottom blowing brick core is smaller than a preset size;
acquiring the oxygen content in the back-blowing gas, and sending an alarm signal when the oxygen content exceeds a preset oxygen content value;
the air brick with the cushion brick structure is used, and fire clay is smeared at the front end and the periphery of the cushion brick so as to seal a hole at the lower part of the air brick core;
when the air brick is replaced, the residual brick is pulled out by adopting a pulling mechanism.
Further, obtain the size of end brick core of blowing to make the product off-line when blowing the size of end brick core and being less than preset size, specifically include:
and a safety display structure is arranged at a preset height at the lower part of the air brick, and the material of the safety display structure is different from the brightness of the air brick in a hot state.
Further, the preset height is 200mm below the air brick.
Further, the preset oxygen content value is 0.01%.
Furthermore, the thickness of the fire clay smeared at the front end and the periphery of the cushion brick is 2-3 mm.
Further, the method further comprises:
and sealing the mounting hole on the cladding.
The process method for preventing the steel ladle bottom blowing from leaking steel provided by the invention obtains the size of the bottom blowing brick core, and enables a product to be off-line when the size of the bottom blowing brick core is smaller than a preset size; acquiring the oxygen content in the back-blowing gas, and sending an alarm signal when the oxygen content exceeds a preset oxygen content value; the air brick with the cushion brick structure is used, and fire clay is smeared at the front end and the periphery of the cushion brick so as to seal a hole at the lower part of the air brick core; when the air brick is replaced, the residual brick is pulled out by adopting a pulling mechanism. The safe operation of the position of the air brick at the bottom of the ladle can be ensured, thereby realizing the purpose of preventing the steel ladle from bottom blowing bleed-out and solving the technical problem of bleed-out caused by the consumption of the air brick in the prior art.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a flow chart of a specific embodiment of a process for preventing steel ladle bottom leakage by blowing provided by the invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a flow chart of an embodiment of a method for preventing steel from bottom-blowing and leaking from a ladle according to the present invention.
In a specific embodiment, the process method for preventing the steel ladle bottom from leaking comprises the following steps:
s1: obtaining the size of the bottom blowing brick core, and enabling the product to be offline when the size of the bottom blowing brick core is smaller than a preset size; specifically, a safety display structure may be installed at a predetermined height in a lower portion of the air brick, and a material of the safety display structure is distinguished from a luminance of the air brick in a hot state. Optionally, the preset height is 200mm below the air brick.
That is, the air brick is positioned at the bottommost part of the ladle and is subjected to the ferrostatic pressure during the use process. When the residual length of the brick core is too short, the contact area between the brick core and the brick cup is reduced, the strength of the brick core body is also reduced, and cracks easily appear under the influence of rapid cooling and rapid heating. If the pressure which can be borne by the brick core is less than the ferrostatic pressure, the brick core is pressed to fall off by the molten steel, or the molten steel permeates from cracks of the brick body, so that the steel leakage accident is caused. Through designing the safety display device, the safety display mark is arranged at the lower part of the air brick with the height of about 200mm, and the material has obvious difference with the appearance and brightness of the material of the air brick body in a hot state and is easy to judge. The safety display is seen in the use process, the wire is immediately taken off, and the steel leakage accident caused by the over-short of the air brick can be effectively avoided.
S2: acquiring the oxygen content in the back-blowing gas, and sending an alarm signal when the oxygen content exceeds a preset oxygen content value; specifically, the preset oxygen content value is 0.01%. In addition, in addition to measuring the oxygen content, the purity of argon gas in the refining process can be directly measured, and the purity of argon gas used in the molten steel refining process is required to be 99.99%, and the phenomenon of oxygen mixing is not allowed. However, sometimes the purity of the argon used is low, and oxygen is mixed in, and the mixed oxygen can cause secondary oxidation of the molten steel, thereby affecting the refining effect. In the blowing process, oxygen reacts with molten steel, the temperature of the oxygen and the molten steel is up to 2000 ℃, the surface melting loss of the air brick is accelerated, the air brick is quickly eroded under the action of air flow scouring, the service life of the air brick is shortened, and the air brick leaks steel under severe conditions. Whether it is a slit, a ceramic rod or a diffused air brick, it cannot resist the melting loss caused by the reaction of oxygen and molten steel. Therefore, the purity of the back-blowing gas is ensured by controlling the oxygen content of the back-blowing gas argon, the oxygen content of the argon is sampled and detected, and a detection alarm device is arranged to send an alarm signal when the content of the argon is low or the content of the oxygen is high.
S3: the air brick with the backing brick structure is used, fire clay is smeared at the front end and around the backing brick so as to seal a hole at the lower part of the air brick core, wherein the thickness of the fire clay smeared at the front end and around the backing brick is 2-3 mm. That is to say, the air brick will evenly scribble a layer of fire clay outside the brick core when the on-the-spot equipment, and fire clay seam thickness generally requires 2 ~ 3mm, and operating rules require that the brick core is aimed at with brick cup hole level, and brick core lower part fire clay can not scraped by other objects such as brick cup in the installation. If the daubing is not uniform or the fireclay falls off in the installation process, the fireclay in the brick core in the seat brick is thicker on one side and thinner on the other side, and the thick side of the fireclay seam is easily washed away by molten steel due to the fact that the fireclay powder is low in strength at high temperature and is not scour-resistant, so that the service life of the air brick is shortened. In the later period of use, molten steel permeates by taking a fire-mud gap as a channel, so that steel leakage accidents are easily caused. If the fire mud on one side is scraped, the iron sheet cannot be completely combined with the inner hole of the brick cup, a certain gap is reserved, the iron sheet can be gradually oxidized and corroded by high-temperature atmosphere, and then steel leakage is easy to occur. Through the air brick with the pad brick structure, the pad brick plays a supporting and protecting role at the bottom of the split brick, and fire clay is further smeared at the front end and around the pad brick so as to seal a hole at the lower part of the air brick core. If the brick core has the phenomenon of steel seepage, molten steel flows to the position of the brick pad, the temperature is reduced, and the molten steel can be solidified at the position, so that the accident is prevented from being enlarged. If the fire clay of the brick pad is not full, the secondary protection effect can not be achieved. Therefore, in the actual construction process, the operation specifications are strictly observed, and the construction quality is ensured.
S4: when the air brick is replaced, the residual brick is pulled out by adopting a pulling mechanism. The steel bar is extended to the surface of the brick core from the position of the opening of the brick, and the brick core is manually crushed. The operation inevitably collides with the surface of the brick cup in the implementation process, the strength of the brick cup is very low in the hot state, the surface brick cup can be damaged or the brick cup can be knocked out of cracks when the brick cup is impacted, and steel leakage is caused along with the expansion of the cracks in the later use stage. Therefore, the operation method for replacing the air brick is changed, and the residual brick is pulled out by the pulling mechanism, so that the condition can be avoided, and the labor intensity of workers is reduced.
The method also includes plugging the mounting hole in the enclosure. The integral air brick seat brick is arranged in the ladle cladding, and the air brick tail pipe penetrates through the ladle bottom cladding to extend out and is communicated with an external air source. A mounting hole is reserved at the bottom of the cladding, and the diameter of the mounting hole can be generally 30-50 mm when the tail pipe is put down. The inside of the air brick is contacted with molten steel in the use process, the temperature reaches about 1600 ℃, and the bottom of the air brick is contacted with the outside air and is stabilized at about 150 ℃. The larger the opening is, the faster the temperature of the bottom of the brick cup is reduced, the larger the temperature difference between the upper part and the lower part is, the more easily the brick cup generates microcracks under the influence of temperature gradient, and along with the increase of the use times, the crack width is also larger and larger, and finally the breakout accident can be caused. In addition, the depth of the bottom of the air brick core embedded in the brick cup is 0-40 mm, and when steel is connected with a ladle, the hydrostatic pressure of molten steel acts on the brick core and then is transmitted to the bottom of the brick cup. If the brick cup is not supported by a steel shell or the supporting area is small, the castable with the thickness of 0-40 mm is likely to be cracked under the dual actions of pressure and thermal shock, so that the brick core moves downwards, and the breakout accident of the air brick is also caused. Therefore, the mounting hole is plugged or normally perforated as required, so that the use safety of the air brick is ensured.
In the above specific embodiment, the process method for preventing steel ladle bottom blowing bleed-out provided by the invention obtains the size of the bottom blowing brick core, and enables the product to be offline when the size of the bottom blowing brick core is smaller than the preset size; acquiring the oxygen content in the back-blowing gas, and sending an alarm signal when the oxygen content exceeds a preset oxygen content value; the air brick with the cushion brick structure is used, and fire clay is smeared at the front end and the periphery of the cushion brick so as to seal a hole at the lower part of the air brick core; when the air brick is replaced, the residual brick is pulled out by adopting a pulling mechanism. The safe operation of the position of the air brick at the bottom of the ladle can be ensured, thereby realizing the purpose of preventing the steel ladle from bottom blowing bleed-out and solving the technical problem of bleed-out caused by the consumption of the air brick in the prior art.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (6)
1. A process method for preventing steel ladle bottom blowing from leaking is characterized by comprising the following steps:
obtaining the size of the bottom blowing brick core, and enabling the product to be offline when the size of the bottom blowing brick core is smaller than a preset size;
acquiring the oxygen content in the back-blowing gas, and sending an alarm signal when the oxygen content exceeds a preset oxygen content value;
the air brick with the cushion brick structure is used, and fire clay is smeared at the front end and the periphery of the cushion brick so as to seal a hole at the lower part of the air brick core;
when the air brick is replaced, the residual brick is pulled out by adopting a pulling mechanism.
2. The process method for preventing the steel ladle bottom blowing bleed-out as claimed in claim 1, wherein the step of obtaining the size of the bottom blowing brick core and enabling the product to be offline when the size of the bottom blowing brick core is smaller than a preset size specifically comprises the steps of:
and a safety display structure is arranged at a preset height at the lower part of the air brick, and the material of the safety display structure is different from the brightness of the air brick in a hot state.
3. The process for preventing the ladle bottom from blowing out of steel according to claim 2, wherein the predetermined height is 200mm below the air brick.
4. The process for preventing ladle bottom-blowing bleed-out as defined in claim 1, wherein the predetermined oxygen content value is 0.01%.
5. The process method for preventing the steel ladle bottom from leaking steel according to claim 1, wherein the thickness of the fire clay smeared at the front end and the periphery of the backing brick is 2-3 mm.
6. The process for preventing ladle bottom-blowing bleed-out as defined in claim 1, further comprising:
and sealing the mounting hole on the cladding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011464118.1A CN112626314A (en) | 2020-12-11 | 2020-12-11 | Technological method for preventing steel ladle bottom blowing steel leakage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011464118.1A CN112626314A (en) | 2020-12-11 | 2020-12-11 | Technological method for preventing steel ladle bottom blowing steel leakage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112626314A true CN112626314A (en) | 2021-04-09 |
Family
ID=75312434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011464118.1A Pending CN112626314A (en) | 2020-12-11 | 2020-12-11 | Technological method for preventing steel ladle bottom blowing steel leakage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112626314A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103114176A (en) * | 2011-11-17 | 2013-05-22 | 洛阳利尔耐火材料有限公司 | Sound-light alarm apparatus for preventing ladle bottom blowing air brick steel bleed-out |
-
2020
- 2020-12-11 CN CN202011464118.1A patent/CN112626314A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103114176A (en) * | 2011-11-17 | 2013-05-22 | 洛阳利尔耐火材料有限公司 | Sound-light alarm apparatus for preventing ladle bottom blowing air brick steel bleed-out |
Non-Patent Citations (1)
| Title |
|---|
| 李壮等: "精炼钢包透气砖漏钢事故影响因素分析", 《耐火与石灰》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4796277A (en) | Melting furnace for melting metal | |
| KR20080048019A (en) | Assembly of a refractory nozzle and sealing element | |
| JP2006053128A (en) | Container for molten metal, use of container, and method of determining interface layer | |
| US6471911B1 (en) | Method and device for sealing a tap hole in metallurgical containers | |
| CN112626314A (en) | Technological method for preventing steel ladle bottom blowing steel leakage | |
| KR101965768B1 (en) | The Method of Melt Treatment the Copper-Iron Alloy | |
| CN107130080B (en) | A kind of method for repairing and mending of external orifice of steel-tapping hole of converter brick breakage | |
| KR20130100160A (en) | Floor casting nozzle for arrangement in the floor of a metallurgical container | |
| JP4815821B2 (en) | Continuous casting method of aluminum killed steel | |
| US4530864A (en) | Porous ceramic structure | |
| CN112921144A (en) | Method for melting slag by using furnace slag | |
| KR100396090B1 (en) | Porous Plug in Ladle | |
| CN112680557A (en) | Dephosphorization method for smelting ultra-low phosphorus steel | |
| CN214079146U (en) | Detect incomplete thick detection and judgment mechanism of ladle package end brick safety | |
| KR101516785B1 (en) | Submerged entry nozzle | |
| KR100960321B1 (en) | Estimation apparatus for state of fireproof material in the ladle wall | |
| JPH07232249A (en) | Nozzle for casting molten metal | |
| CN213888138U (en) | Safety locking device for bottom blowing and ventilating core of ladle | |
| CN103846421A (en) | Combined building brick capable of judging thickness of ladle bath | |
| CN116397076A (en) | Ladle externally-mounted bottom blowing brick leakage-proof structure | |
| CN115304360B (en) | Gap filler capable of preventing steel leakage for converter bottom blowing circular seam type air supply system and preparation and application thereof | |
| CN214349590U (en) | Immersion type water gap | |
| CN114317895A (en) | RH furnace dip pipe erosion monitoring device and using method thereof | |
| JPH032934B2 (en) | ||
| US20010040322A1 (en) | Immersion nozzle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210409 |
|
| RJ01 | Rejection of invention patent application after publication |