CN113832301A - Bottom blowing ventilation device for molten iron tank refining - Google Patents
Bottom blowing ventilation device for molten iron tank refining Download PDFInfo
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- CN113832301A CN113832301A CN202111098935.4A CN202111098935A CN113832301A CN 113832301 A CN113832301 A CN 113832301A CN 202111098935 A CN202111098935 A CN 202111098935A CN 113832301 A CN113832301 A CN 113832301A
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- Prior art keywords
- molten iron
- air
- brick
- iron tank
- argon
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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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- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a bottom blowing ventilation device for molten iron tank refining, which comprises a molten iron tank body, wherein a refractory castable is filled at the bottom of the molten iron tank body, and 2-4 air bricks are laid in the refractory castable. The air brick of the hot metal ladle adopts the air slits or the air holes, can generate micro argon bubbles with the diameter of 5mm or less when argon is blown, plays the role of a small vacuum chamber, and dissolved gas (H, N, O) in molten iron is continuously transmitted into the micro argon bubbles and then floats upwards to be discharged, so that the gas content in the molten iron is reduced, and the steel quality is improved; the micro argon bubble group obtained by the method has the advantages of wide distribution range, good dispersibility, more than or equal to 2 multiplied by 106 bubbles per cubic meter, good impurity removal effect, argon blowing cost saving, molten iron refining level 1.2-1.5 times that of the prior art, reduction of the viscosity of molten iron, improvement of castability by 10-15%, reduction of the casting blank surface cleaning rate by 15-30%, and good use effect.
Description
Technical Field
The invention relates to the technical field of a ventilation device for molten iron tank refining, in particular to a bottom blowing ventilation device for molten iron tank refining.
Background
More than 70% of iron ores used by Chinese iron and steel enterprises depend on import, because the import specific gravity is large, the price of the iron ores is often limited abroad, that is, the cost of molten iron is limited by the huge amount of foreign iron ores. The cost of molten iron accounts for more than half of the cost of steel, so steel mills always try to use scrap steel to replace molten iron in order to reduce the cost of steel. Therefore, increasing the scrap ratio is an important issue for steel mills.
Newly building a scrap heating wire, adding the scrap heated to the temperature of more than 700 ℃ into a mixer from an iron receiving port of the mixer for mixing; or directly adding the scrap steel heated to the temperature of over 700 ℃ into a hot metal ladle, uniformly blowing argon, and then adding into a converter to become the first choice of a steel mill.
Before molten iron enters a steel-making furnace, desulfurization pretreatment is carried out on the molten iron so as to remove overhigh harmful component, namely sulfur, in the molten iron. The technology of improving molten iron quality and improving desulfurization efficiency by supplying gas into a molten iron tank through gas permeable bricks has been widely adopted in molten iron pretreatment in many steel mills since 2000, and has become a basic technology in molten iron pretreatment. During molten iron pretreatment, molten iron contained in the molten iron tank is inclined towards the slag removing machine (namely inclined towards the opposite side of the ladle-turning pile) so as to facilitate slag removal, and the air brick of the molten iron tank is arranged on the side of the ladle-turning pile, so that the molten iron slag rushes towards the side of the slag removing machine by blowing in gas, and the effect of rapidly removing the slag is achieved.
The invention discloses an iron leakage prevention structure of an air brick of a hot metal ladle and a replacement method of the air brick of the iron leakage prevention in a patent with the application number of CN 201710004588.1. The method comprises the following specific operation steps of replacement of the iron leakage prevention air brick: firstly, detaching original working layer masonry bricks with the adjacent distance of the outer edges of the air bricks being not less than 600mm, taking out old air bricks, installing new air bricks, reserving gaps between the peripheries of the new air bricks and the original permanent layer of the hot-metal ladle, then filling clay ramming materials mixed by brine in the gaps, ramming, then using magnesia carbon bricks to back-build and remove the parts in a wet-building mode, simultaneously ensuring that gaps are reserved between the peripheries of the air bricks and the back-built working layer, pouring corundum self-flowing pouring materials in the gaps, and then naturally curing for 68 hours, and entering a baking stage. The invention only provides an iron leakage prevention structure of the air brick of the hot-metal ladle and a replacement method of the air brick of the iron leakage prevention, and does not relate to the design of the air brick, in particular to the effect of bottom blowing uniform molten iron of the air brick.
The invention discloses a steel ladle gas permeable brick, which comprises an outer-coated steel sheet, a gas permeable brick plate, a gas permeable brick core, an occlusion connecting rod, a gas injection main pipe, a shunt branch gas pipe, a gas pressure port and a brick plate protecting ring, wherein the outer-coated steel sheet is arranged on the gas permeable brick core in a surrounding mode, the gas permeable brick plate is arranged on the gas permeable brick core, the brick plate protecting ring is arranged on the gas permeable brick plate in a surrounding mode, the gas pressure port is arranged on the gas permeable brick plate, the occlusion connecting rod is arranged in the gas permeable brick core, the gas injection main pipe is arranged on the outer-coated steel sheet, one end of the shunt branch gas pipe is arranged on the gas injection main pipe, and the other end of the shunt branch gas pipe is arranged on the gas pressure port. The invention belongs to the technical field of refractory materials for ladles, and particularly relates to a ladle air brick which effectively overcomes the defect that the core of the ladle brick is lost due to overlarge air pressure when the ladle brick in the current market is used, enhances the engaging force between the air brick and the core, prolongs the service life and is very practical. The air brick overcomes the defect of loss caused by the ladle brick core, but does not have the discussion evaluation of bottom blowing effect.
The invention discloses an air brick for bottom blowing of superfine argon bubbles for ladle refining, which is disclosed by the application number CN202010748837.X, and provides the air brick for the bottom blowing of the superfine argon bubbles for ladle refining, which comprises an air brick body, a brick sleeve, a bottom cover plate and an air inlet pipe, wherein the air brick body is in a circular truncated cone shape, the brick sleeve is sleeved on the outer circumferential surface of the air brick body, the bottom cover plate is arranged at the bottom of the air brick body, and a cavity is arranged between the air brick body and the brick sleeve; the air inlet pipe penetrates through the center of the bottom cover plate and is communicated with the cavity; a through round hole slit is arranged between the working surface and the bottom surface of the air brick body, and the torsion angle alpha of the round hole slit is larger than 0 degree and not larger than 60 degrees; the circular hole slits are arranged in a circular ring shape on any cross section of the air brick body, the number of the circular ring is not less than 3, and the circular ring is the same as the circle center of the corresponding cross section. The air brick provided by the invention is more beneficial to removing impurities in molten steel, reduces the time for alloying and uniformly mixing the molten steel, prolongs the service life of the air brick, and reduces the maintenance frequency of a steel ladle. The invention is used for ladle refining, and is different from the invention used for a hot metal ladle.
Research shows that argon is blown into molten steel to play a role in refining the molten steel: can effectively remove non-metallic inclusions, remove dissolved gas and strengthen decarburization. Argon is blown into molten steel, generated argon bubbles can be attached to nonmetallic inclusions, and the nonmetallic inclusions in the molten steel can float up to a slag layer on the surface of the molten steel due to the pressure difference between the molten steel and the bubbles. The small argon bubbles in the molten steel can play the role of a small vacuum chamber, and the dissolved gas (H, N, O) in the molten steel is continuously introduced into the molten steel and then floats upwards to be discharged, so that the gas content in the molten steel is reduced, and the steel quality is improved. The above effects can be obtained by blowing argon gas into molten iron using the gas permeable bricks of the hot-metal ladle.
No matter the molten iron is uniformly stirred by blowing argon into the scrap steel added into the molten iron tank or the molten iron is pretreated to play a rapid slag-off effect, the molten iron can be refined by blowing argon into the molten iron, and the permeable bricks of the molten iron tank are produced by uniformly mixing the components and the temperature of the molten iron and removing the nonmetallic inclusions in the molten iron.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a bottom blowing ventilation device for refining a hot metal ladle.
The technical scheme of the invention is as follows: the utility model provides a bottom blowing ventilative device for hot metal bottle is concise, includes the hot metal bottle body, the bottom of hot metal bottle body fill have refractory castable, refractory castable in masonry have 2 ~ 4 air brick.
Preferably, the air bricks are symmetrically arranged relative to the plate hooks of the hot metal ladle body.
Preferably, the air bricks are symmetrically arranged at 30-60 or 120-150 degrees relative to the horizontal plane of the plate hook of the hot metal ladle body.
Preferably, the air bricks are symmetrically arranged at an angle of 45 degrees relative to the horizontal plane of the plate hook of the hot metal ladle body.
Preferably, the air bricks are symmetrically arranged at an angle of 40 degrees relative to the horizontal plane of the plate hook of the hot metal ladle body.
Preferably, the air brick is provided with air slits or air holes of independent channels.
Preferably, the width of the air permeable slit is 0.10-0.20 mm, the length of the air permeable slit is 2-100 times of the width, the center distance is 25-50 mm, and the area ratio of the area of the air permeable slit to the area of the upper surface of the air permeable brick is 1: 125-300.
Preferably, the diameter of the air holes is 0.10-0.20 mm, the center distance is 25-50 mm, and the area ratio of the hole area to the upper surface of the air brick is 1: 200-500.
The invention has the beneficial effects that:
1. the air brick of the hot metal ladle adopts the air slits or the air holes, can generate micro argon bubbles with the diameter of 5mm or less when argon is blown, plays the role of a small vacuum chamber, and dissolved gas (H, N, O) in molten iron is continuously transmitted into the micro argon bubbles and then floats upwards to be discharged, so that the gas content in the molten iron is reduced, and the steel quality is improved;
2. the micro argon bubble group obtained by the method has a wide distribution range and good dispersibility, the number of bubbles per cubic meter is more than or equal to 2 x 106, the impurity removal effect is good, the argon blowing cost is saved, the molten iron refining level is improved to 1.2-1.5 times of the level of the prior art, the viscosity of molten iron is reduced, the castability is improved by 10-15%, the casting blank surface cleaning rate is reduced by 15-30%, and the use effect is good;
3. the invention has simple structure and convenient building; the bottom blowing effect is good, and the iron preparation time is favorably shortened; the steel yield and the scrap steel ratio are improved, and the steel-making cost is reduced.
Drawings
FIG. 1 is a schematic view of the construction of the venting device of the present invention;
FIG. 2 is a top view of the venting device of the present invention;
in the figure, 1-a hot metal ladle body, 2-refractory castable, 3-air bricks, 4-air slits, 5-air holes and 6-plate hooks.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
example 1
As shown in fig. 1 and 2, the present embodiment provides a bottom-blowing ventilation device for molten iron tank refining, which includes a molten iron tank body 1, wherein a refractory castable 2 is filled at the bottom of the molten iron tank body 1, and 2 to 4 air bricks 3 are laid in the refractory castable 2.
Preferably, the air brick 3 is symmetrically arranged at 40 degrees relative to the plate hook 6 of the hot metal ladle body 1.
Preferably, the air brick 3 is provided with an air slit 4 or an air hole 5 of an independent channel. The width of the air permeable slit 4 is 0.10-0.20 mm, the length of the air permeable slit is 2-100 times of the width, the center distance is 25-50 mm, and the area ratio of the area of the air permeable slit to the area of the upper surface of the air permeable brick is 1: 125-300. The diameter of the air holes is 0.10-0.20 mm, the center distance is 25-50 mm, and the area ratio of the hole area to the upper surface of the air brick is 1: 200-500.
Example 2
As shown in fig. 1 and 2, the present embodiment provides a bottom-blowing ventilation device for molten iron tank refining, which includes a molten iron tank body 1, wherein a refractory castable 2 is filled at the bottom of the molten iron tank body 1, and 2 to 4 air bricks 3 are laid in the refractory castable 2.
Preferably, the air brick 3 is arranged symmetrically at 45 degrees relative to the plate hook 6 of the hot metal ladle body 1.
Preferably, the air brick 3 is provided with an air slit 4 or an air hole 5 of an independent channel. The width of the air permeable slit 4 is 0.10-0.20 mm, the length of the air permeable slit is 2-100 times of the width, the center distance is 25-50 mm, and the area ratio of the area of the air permeable slit to the area of the upper surface of the air permeable brick is 1: 125-300. The diameter of the air holes is 0.10-0.20 mm, the center distance is 25-50 mm, and the area ratio of the hole area to the upper surface of the air brick is 1: 200-500.
The air brick 3 of the hot metal ladle of the embodiment adopts the air slit 4 or the air hole 5, can generate the micro argon bubbles with the diameter of 5mm or less when blowing argon, and plays the role of a small vacuum chamber, and the dissolved gas (H, N, O) in the molten iron is continuously transferred into the micro argon bubbles and then floats upwards to be discharged, thereby reducing the gas content in the molten iron and improving the steel quality.
Secondly, the distribution range of the obtained fine argon bubble groups is wide, the dispersibility is good, the number of bubbles per cubic meter is more than or equal to 2 x 106, the impurity removal effect is good, the argon blowing cost is saved, the molten iron refining level is improved to 1.2-1.5 times of the level of the prior art, the viscosity of molten iron is reduced, the castability is improved by 10-15%, the casting blank surface cleaning rate is reduced by 15-30%, the using effect is good, the uniform stirring time after the molten iron tank is added with scrap steel is shortened, the using effect is good, and the iron preparation time is shortened.
In addition, in the steelmaking process of the embodiment, after scrap steel is added into the hot metal ladle, argon is blown through the bottom-blowing air brick 3 for stirring, so that the iron preparation time is shortened, the steel yield is increased, the scrap steel ratio is increased, and the steelmaking cost is reduced. In the steelmaking process, when the molten iron tank body 1 is subjected to desulfurization pretreatment, argon gas is blown through the bottom-blowing air brick 3 for stirring, so that the removing time of blast furnace slag is shortened, the iron preparation time is shortened, the steel yield is improved, the scrap steel ratio is improved, and the steelmaking cost is reduced.
The foregoing embodiments and description have been presented only to illustrate the principles and preferred embodiments of the invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention as hereinafter claimed.
Claims (5)
1. A bottom blowing ventilation device for molten iron tank refining comprises a molten iron tank body (1) and is characterized in that a refractory castable (2) is filled at the bottom of the molten iron tank body (1), and 2-4 air bricks (3) are laid in the refractory castable (2);
each air brick (3) is provided with an air slit (4) or an air hole (5) of an independent channel;
the width of the air permeable slit is 0.10-0.20 mm, the length of the air permeable slit is 2-100 times of the width, the center distance is 25-50 mm, and the area ratio of the area of the air permeable slit to the area of the upper surface of the air permeable brick is 1: 125-300;
the diameter of the air holes is 0.10-0.20 mm, the center distance is 25-50 mm, and the area ratio of the hole area to the upper surface of the air brick is 1: 200-500.
2. The bottom-blowing ventilating device for molten iron tank refining according to claim 1, wherein: the air bricks (3) are symmetrically arranged relative to the plate hook (6) of the hot metal ladle body (1).
3. The bottom-blowing ventilating device for molten iron tank refining according to claim 2, wherein: the air bricks (3) are symmetrically arranged at 30-60 or 120-150 degrees relative to the horizontal direction of the plate hook (6) of the hot metal ladle body (1).
4. The bottom-blowing ventilating device for molten iron tank refining according to claim 3, wherein: the air bricks (3) are symmetrically arranged at 45 degrees relative to the horizontal direction of the plate hook (6) of the hot metal ladle body (1).
5. The bottom-blowing ventilating device for molten iron tank refining according to claim 3, wherein: the air bricks (3) are symmetrically arranged at 40 degrees relative to the horizontal direction of the plate hook (6) of the hot metal ladle body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111098935.4A CN113832301A (en) | 2021-09-18 | 2021-09-18 | Bottom blowing ventilation device for molten iron tank refining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111098935.4A CN113832301A (en) | 2021-09-18 | 2021-09-18 | Bottom blowing ventilation device for molten iron tank refining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113832301A true CN113832301A (en) | 2021-12-24 |
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ID=78960000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111098935.4A Withdrawn CN113832301A (en) | 2021-09-18 | 2021-09-18 | Bottom blowing ventilation device for molten iron tank refining |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113832301A (en) |
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2021
- 2021-09-18 CN CN202111098935.4A patent/CN113832301A/en not_active Withdrawn
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Application publication date: 20211224 |
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| WW01 | Invention patent application withdrawn after publication |