CN109072320B - Method and apparatus for desulfurizing molten iron - Google Patents
Method and apparatus for desulfurizing molten iron Download PDFInfo
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- CN109072320B CN109072320B CN201780025893.7A CN201780025893A CN109072320B CN 109072320 B CN109072320 B CN 109072320B CN 201780025893 A CN201780025893 A CN 201780025893A CN 109072320 B CN109072320 B CN 109072320B
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- desulfurizing agent
- desulfurizing
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
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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
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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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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Furnace Charging Or Discharging (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Provided is a technology for desulfurizing steel at a high desulfurization rate during tapping of a converter. Blowing a desulfurizing agent (7) from a blowing nozzle (3) to a steel flow (11) when steel is discharged from a refining vessel (1) to a ladle (2) using a blowing device (6), the blowing device (6) comprising: a blowing nozzle (3) provided in the input chute (8); a container (hopper) (4) which stores a desulfurizing agent; and a pipe (5) for connecting the blowing nozzle (3) and the container (hopper) (4).
Description
Technical Field
The present invention relates to a method and apparatus for desulfurizing molten iron.
Background
Conventionally, when low-sulfur steel having [ S ] of 24ppm or less is melted, for example, desulfurization is performed by simultaneously charging a desulfurizing agent and a deoxidizing agent from a charging chute into a ladle when tapping from a converter into the ladle in order to reduce the desulfurization load in secondary refining. However, since the desulfurizing agent is difficult to be involved in the molten steel, the desulfurization degree is low.
Patent document 1 discloses the following method: desulfurization is performed by adding a deoxidizer, a desulfurizing agent, and a slag modifier to molten steel in tapping. The method uses the stirring energy of the steel flow when the converter discharges steel to stir the desulfurizer and the molten steel so as to enable the desulfurizer and the molten steel to react.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 8-225824
Patent document 2: japanese patent laid-open No. 2005-187901
Disclosure of Invention
Problems to be solved by the invention
The technique disclosed in patent document 1 is to react a desulfurizing agent with molten steel only by using stirring energy of a steel stream. Therefore, the stirring force is insufficient and the desulfurizing agent cannot be effectively utilized, and therefore, the desulfurization rate is low.
In addition, in order to increase the desulfurization rate, it is effective to make the particle size of the desulfurizing agent smaller. However, in the technique disclosed in patent document 1, if a fine-grained desulfurizing agent (about 1 mm) is used, a part of the desulfurizing agent inevitably scatters and dissipates. This causes a decrease in the material utilization rate of the desulfurizing agent and a problem of desulfurization.
In order to implement the solution disclosed in patent document 2, as described in paragraph 0033 of patent document 2 and fig. 1, a lance moving device (not shown) needs to be newly provided independently of the raw material charging device 16 in order to move and tilt the lance 2 in the vertical direction while changing the tilt angle of the lance 2 so that the lance 2 approaches the injection flow 18. Therefore, the equipment cost rises. Further, the lance 2 needs to be disposed in the vicinity of the converter 12 independently of the raw material charging device 16, and therefore the facility becomes large.
The purpose of the present invention is to provide a technique that enables the desulfurization of molten iron at a high desulfurization rate when tapping from a refining furnace (e.g., a converter) to a refining vessel (e.g., a ladle).
Means for solving the problems
The present invention is a method for desulfurizing molten iron by adding a desulfurizing agent to a tapping flow flowing down while varying the position of the tapping flow, when tapping molten iron from a refining furnace to a refining vessel,
using a blowing apparatus having: a blowing nozzle attached to a charging chute whose charging direction is variable for charging the raw material into the refining vessel, the blowing nozzle discharging a desulfurizing agent; a storage container that stores a desulfurizing agent; and a desulfurizing agent supply path for supplying the desulfurizing agent stored in the storage container to the blowing nozzle,
the desulfurizing agent is blown from the blowing nozzle to the tapped flow while the blowing direction in which the desulfurizing agent is blown by the blowing nozzle and the charging chute follow the variation of the downflow position of the tapped flow.
From another aspect, the present invention is an apparatus for desulfurizing molten iron, which adds a desulfurizing agent to a tapped flow flowing down while varying a flow-down position of molten iron from a refining furnace to a refining vessel,
the molten iron desulfurization apparatus is provided with a blowing device, and the blowing device is provided with: a blowing nozzle attached to a charging chute whose charging direction is variable for charging the raw material into the refining vessel, the blowing nozzle discharging a desulfurizing agent; a storage container that stores a desulfurizing agent; and a desulfurizing agent supply path for supplying the desulfurizing agent stored in the storage container to the blowing nozzle,
the blowing direction of the desulfurizing agent blown out by the blowing nozzle is variable together with the charging chute, and the blowing nozzle can blow the desulfurizing agent so as to follow the variation of the downflow position of the tapped flow.
In these inventions, it is preferable that the position of blowing the desulfurizing agent to the tapping flow is located above the height position 1/2 between the tap hole of the refining furnace and the liquid level of the molten iron in the refining vessel.
In these inventions, it is preferable that the particle size of the desulfurizing agent is 0.5mm to 1.0 mm.
In these inventions, it is preferable that the desulfurizing agent is blown from the blowing nozzle to the tapping flow in a period of not less than 3/4 from the start of tapping of molten iron from the refining furnace to the refining vessel to the end of tapping.
In these inventions, it is preferable that, simultaneously with or prior to the start of blowing the desulfurizing agent from the blowing nozzle, the introduction of the deoxidizing agent into the interior of the refining vessel from the introduction chute is started.
In these inventions, the molten iron is exemplified as molten steel. In this case, the refining furnace is exemplified as a refining furnace, specifically a converter, which performs primary refining in steel making in which secondary refining is performed, and the refining vessel is exemplified as a ladle.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, since the desulfurizing agent is blown to the tapped flow flowing downward, the entrainment of the desulfurizing agent into the molten iron can be increased by the blowing of the desulfurizing agent to the tapped flow and the stirring force of the tapped flow. Therefore, the desulfurization rate can be improved.
Further, when a desulfurizing agent is added to the surface of the molten metal in the refining vessel from a feed chute or the like as in the prior art, the desulfurizing agent that has not been completely slagging is dusted, and thus a loss of the desulfurizing agent, a problem in the working environment, and the like are caused. Therefore, fine-grained desulfurizing agents cannot be used. However, according to the present invention, the slagging speed of the desulfurizing agent is high, and even a fine desulfurizing agent can be blown without loss, and therefore, the desulfurization rate can be further improved.
Further, the present invention can be implemented only by attaching and fixing the blowing nozzle for discharging the desulfurizing agent to the existing charging chute. Therefore, according to the present invention, since the lance moving device disclosed in patent document 2 does not need to be provided, it is possible to prevent an increase in facility cost and an increase in facility size.
Drawings
FIG. 1 is an explanatory view showing the structure of a molten steel desulfurization apparatus according to the present invention.
FIG. 2 shows the use of a desulfurizing agent CaO-CaF in examples of the present invention and conventional examples2、CaO-Al2O3A graph of desulfurization rates for the cases (1).
Detailed Description
In the following description, the following case will be taken as an example: the molten iron is molten steel, the refining furnace is a converter that is a refining furnace for performing primary refining in steel making for secondary refining, and the refining vessel is a ladle. In the following description, "%" as to chemical composition or concentration means "% by mass" unless otherwise specified.
1. Desulfurization device 0 of the present invention
FIG. 1 is an explanatory diagram showing the structure of a molten steel desulfurization apparatus 0 according to the present invention.
As shown in fig. 1, the desulfurization apparatus 0 is an apparatus for adding a desulfurizing agent 7 to molten steel 11 at the time of tapping after primary refining in steel making by secondary refining. The desulfurization device 0 is provided with blowing means 6. The blowing means 6 blows the desulfurizing agent 7 to the steel stream 11 flowing down from the converter 1 that has performed the primary refining to the ladle 2 that has performed the secondary refining. Further, the type and kind of the converter 1 used for the primary refining are not limited.
The blowing device 6 has a blowing nozzle 3, a storage container 4, and a desulfurizing agent supply path 5. The blowing nozzle 3 is attached to the chute 8. The charging chute 8 is provided so that the charging direction is three-dimensionally variable so as to charge an alloy (for example, a deoxidizer) into the ladle 2. The input chute 8 may be an existing input chute.
The blowing nozzle 3 discharges the desulfurizing agent 11 and blows the desulfurizing agent 7 to the steel stream 11 flowing down while varying the flowing-down position. The storage container 4 stores a desulfurizing agent 7. The desulfurizing agent supply path 7 is, for example, a pipe, and supplies the desulfurizing agent 11 stored in the storage container 4 to the blowing nozzle 3.
The blowing nozzle 3 is attached to the chute 8, and thus the direction of the injection port of the desulfurizing agent 7 is arranged to be variable. Thereby, the blowing nozzle 3 can blow the desulfurizing agent 7 so as to follow the fluctuation of the downflow position of the steel stream 11. That is, the blowing nozzle 3 is disposed so that the injection direction (blowing direction) of the desulfurizing agent 7 is variable within a range that covers the variation range of the downflow position of the steel stream 11.
The type and kind of the blowing nozzle are not particularly limited. The nozzle diameter is preferably 200mm to 300mm in order to prevent scattering of the desulfurizing agent.
2. The desulfurization method of the present invention
The invention aims at low-sulfur steel with [ S ] less than or equal to about 24 ppm. As shown in FIG. 1, the present invention uses a blowing means 6 for blowing a desulfurizing agent 7 from a blowing nozzle 3 into a steel stream 11 when steel is discharged from a converter 1 into a ladle 2.
By blowing the desulfurizing agent 7 from the blowing nozzle 3 to the steel stream 11, the blowing energy and the stirring energy of the steel stream 11 can be effectively utilized flexibly. Therefore, the entrainment of the desulfurizing agent 7 into the steel stream 11 can be increased, and the desulfurization rate can be improved.
Conventionally, when a desulfurizing agent is added to the surface of molten steel from a chute or the like, as described above, fine particles of the desulfurizing agent cannot be used. In contrast, according to the present invention, the entrainment of the desulfurizing agent 7 into the steel stream 11 increases, and therefore, for example, a fine-grained desulfurizing agent 7 having a grain size of 0.5mm to 1.0mm can be used. The finer the particle size of the desulfurizing agent 7 is, the more the surface area contributing to the desulfurization reaction increases, and therefore, the desulfurization rate can be further improved. If the particle size of the desulfurizing agent 7 is less than 0.5mm, the desulfurizing agent that is not completely slagging is dusted, and on the other hand, if the particle size of the desulfurizing agent 7 is more than 1.0mm, the desulfurization rate is lowered. Thus, according to the present invention, the fine desulfurizing agent 7 can be blown and the desulfurization rate can be improved.
The composition of the desulfurizing agent 7 is not particularly limited as long as it is a composition generally used as a desulfurizing agent. Preferably, CaO alone or CaF partially added to CaO is exemplified2、Al2O3To form CaO-CaF2、CaO-Al2O3. The amount of the desulfurizing agent added is not limited.
At this time, it is preferable that the blowing direction of the blowing nozzle 3 is made to follow the molten steel stream 11 flowing down while varying the flowing down position, and the desulfurizing agent 7 is continuously blown to the molten steel stream 11. Generally, the diameter of the tap hole 13 of the converter 1 is 150mm to 250mm, and the diameter of the tap hole is 1100mm to 1300 mm. Therefore, the molten steel stream 11 is thin as compared with the molten iron stream. The steel stream 11 flows down while varying the position of the steel stream flowing down in the horizontal plane due to the angle of deflection of the converter 1, local blockage of the tap hole 13, and the like. Therefore, the blowing direction of the desulfurizing agent 7 is liable to deviate from the steel stream 11, and the desulfurization degree is liable to decrease. In the present invention, the blowing direction of the blowing nozzle 3 is made to follow the steel stream 11, and therefore, the loss of the desulfurizing agent 7 can be prevented.
It is preferable that the desulfurizing agent 7 be blown to the steel stream 11 at a position above the height position of 1/2 between the distance from the tap hole 13 to the liquid surface 12 of the molten steel in the ladle 2. This is because the desulfurizing agent 7 can be fed to the liquid surface 12 from a higher position together with the steel flow 11, and the stirring force can be increased by utilizing the position energy.
The blowing of the desulfurizing agent 7 can use an inert gas. As the inert gas, Ar gas or N gas is preferable2A gas. The injection pressure of the desulfurizing agent 7 is preferably 0.5MPa to 1.0 MPa.
Preferably, the blowing of the desulfurizing agent 7 from the blowing nozzle 3 to the steel stream 11 is performed during a period of 3/4 or more, most preferably during the entire period, from the start of steel tapping from the converter 1 to the ladle 2 to the end of steel tapping, in order to increase the desulfurization degree.
It is preferable to start the introduction of the deoxidizer into the ladle 2 from the introduction chute 8 simultaneously with or prior to the start of the desulfurization agent introduction from the introduction nozzle 3. The desulfurization reaction is a reduction reaction represented by the following formula (1). Therefore, when the oxygen concentration in the molten steel and the oxide concentration such as FeO and MnO in the slag are high, reversion occurs and the desulfurization rate is lowered. By also charging the deoxidizer from the charging chute 8, the concentration of oxygen in the molten steel and the concentration of oxides in the slag are reduced, and the desulfurization rate can be further improved.
CaO+[S]＝CaS+[O]……(1)
The deoxidizer does not have to be blown into the tapped flow 11, and various methods such as placing in the ladle 2 and adding to the tapped flow 11 can be used. The oxygen scavenger may be any commonly used oxygen scavenger, and is not particularly limited. For example, a deoxidizer containing Al is preferable. The amount of the deoxidizer to be added may be appropriately determined depending on the required amount of oxygen in the molten steel, and is not limited.
The present invention can be implemented simply by attaching and fixing the blowing nozzle 3 for discharging the desulfurizing agent 7 to the already-installed charging chute 8. Therefore, according to the present invention, since the lance moving device disclosed in patent document 2 does not need to be provided, it is possible to prevent an increase in facility cost and an increase in facility size.
Examples
The desulfurization rate was determined using the desulfurization apparatus 0 of the present invention shown in fig. 1 and the desulfurization apparatus of the conventional example in which the blowing means 6 was removed from the desulfurization apparatus 0. That is, when molten steel 7 is tapped by blowing (primary refining) in the converter 1 by a conventional method, a desulfurizing agent is added, and the desulfurization degree is determined from [ S ] before and after tapping.
The size of the tap hole 13 of the converter 1 is 250 mm. The desulfurizing agent 7 is added by blowing the desulfurizing agent 7 toward the steel stream 11 using the blowing device 0. The nozzle diameter of the blowing nozzle 3 was 200 mm. Ar gas was used as a carrier gas of the desulfurizing agent 7.
In the desulfurization apparatus 0, the blowing nozzle 3 for the desulfurizing agent 7 is fixed and arranged at the center of the upper part of the charging chute 8 by an appropriate means such as welding or fastening so that the blowing direction of the desulfurizing agent 7 in the horizontal plane coincides with the charging direction from the charging chute 8 in the horizontal plane.
Therefore, the direction of charging is changed to the direction toward the ladle 2 as the charging chute 8 is operated, and the direction of blowing the desulfurizing agent 7 from the blowing nozzle 3 is changed to the direction toward the steel flow 11. Thus, the desulfurizing agent 7 is continuously blown over the entire period from the start of tapping molten steel 11 from the converter 1 into the ladle 2 to the end of tapping while following the fluctuation of the downflow position of the tapped flow 11.
The blowing position of the desulfurizing agent 7 to the steel-tapping flow 11 is set to be higher than the height position 1/2 between the steel-tapping hole 13 and the liquid surface 12.
On the other hand, as a conventional example, a desulfurizing agent is poured into molten steel in the ladle 2 from the pouring chute 8.
Table 1 shows the conditions of the present invention example and the conventional example.
[ Table 1]
TABLE 1
Mn and Si alloys were charged as alloy components, and 3kg/t of Al was charged as a deoxidizer. The chemical composition of the molten steel (after tapping) and the molten steel temperature are shown in table 1.
As the desulfurizing agent, CaO-CaF was used in both the examples of the present invention and the conventional examples2、CaO-Al2O3Two of these. Particle size of desulfurizing agentIn the conventional example, the thickness is from-5 mm, and in the present invention example, from 0.5mm to 1.0 mm. The input amount of the desulfurizing agent is 5 kg/t.
In order to grasp the S concentration before and after desulfurization, sampling was performed before and after tapping to determine the S concentration [ S ] in molten steel]Confirmation is made. Then, the desulfurization percentage (%) before and after tapping was determined based on each sulfur concentration. If will [ S ]]0Set as sulfur concentration before tapping, [ S ]]1The sulfur concentration after tapping was set as [ S ] representing the desulfurization rate]0-[S]1)/[S]0X 100 (%) was obtained.
FIG. 2 shows the use of a desulfurizing agent CaO-CaF in examples of the present invention and conventional examples2、CaO-Al2O3A graph of desulfurization rates for the cases (1). The black columns in the graph of fig. 2 are examples of the present invention, and the white columns are conventional examples.
As shown in the graph of FIG. 2, the desulfurizing agent CaO-CaF was used2、CaO-Al2O3In any case, the desulfurization rates of the inventive examples were about 1.2 times as high as those of the comparative examples.
Further, a desulfurizing agent 7 having a particle diameter of 0.5 to 1mm is charged into the ladle 2 from a charging chute 8. However, the desulfurizing agent 7 which had not been completely melted was dusted, and was not found to be suspended in the molten steel in the ladle 2, and was visually checked to be unmixed.
Description of the reference numerals
0. The desulfurization apparatus of the present invention; 1. refining furnaces (converters and the like); 2. refining vessel (ladle); 3. a blowing nozzle; 4. a container (hopper); 5. piping; 6. a blowing device; 7. a desulfurizing agent; 8. throwing into a chute; 11. tapping flow; 12. a liquid level; 13. and (4) tapping a steel hole.
Claims (9)
1. A method of desulfurizing molten iron by adding a granular desulfurizing agent to a tapping flow flowing down while varying the position of the tapping flow, when tapping molten iron from a refining furnace to a refining vessel,
using a blowing apparatus having: a blowing nozzle which is installed on the upper part of the charging chute, the charging direction of which is variable for charging the raw material into the refining vessel, and discharges the desulfurizing agent; a storage container that stores a desulfurizing agent; and a desulfurizing agent supply path for supplying the desulfurizing agent stored in the storage container to the blowing nozzle,
and blowing the desulfurizing agent from the blowing nozzle to the tapped flow while causing a blowing direction in which the desulfurizing agent is blown by the blowing nozzle to follow a variation in a flowing-down position of the tapped flow together with the input chute.
2. The method for desulfurizing molten iron according to claim 1,
the position at which the desulfurizing agent is blown to the tapping is located above a height position 1/2 between the tapping of the refining furnace and the liquid level of the molten iron in the refining vessel.
3. The method for desulfurizing molten iron according to claim 1 or 2, wherein,
the grain size of the desulfurizer is 0.5 mm-1.0 mm.
4. The method for desulfurizing molten iron according to claim 1 or 2, wherein,
the desulfurizing agent is blown from the blowing nozzle to the tapping flow in a period of 3/4 or more from a start of tapping of the molten iron from the refining furnace to the refining vessel to an end of the tapping.
5. The method for desulfurizing molten iron according to claim 1 or 2, wherein,
simultaneously with or prior to the start of blowing the desulfurizing agent from the blowing nozzle, starting to charge a deoxidizing agent into the refining vessel from the charging chute.
6. The method for desulfurizing molten iron according to claim 1 or 2, wherein,
the molten iron is molten steel.
7. The method for desulfurizing molten iron according to claim 6,
the refining furnace is a refining furnace for primary refining in steel making for secondary refining.
8. The method for desulfurizing molten iron according to claim 7,
the refining furnace is a converter and the refining vessel is a ladle.
9. A molten iron desulfurizing apparatus for adding a granular desulfurizing agent to a tapping flow flowing down while varying the position of the tapping flow, while tapping molten iron from a refining furnace to a refining vessel,
the molten iron desulfurization apparatus is provided with a blowing device, and the blowing device is provided with: a blowing nozzle which is installed on the upper part of the charging chute, the charging direction of which is variable for charging the raw material into the refining vessel, and discharges the desulfurizing agent; a storage container that stores a desulfurizing agent; a desulfurizing agent supply path for supplying the desulfurizing agent stored in the storage container to the blowing nozzle,
the blowing direction of the desulfurizing agent by the blowing nozzle is variable together with the charging chute, and the blowing nozzle can blow the desulfurizing agent so as to follow the variation of the flowing-down position of the tapping flow.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016086923 | 2016-04-25 | ||
| JP2016-086923 | 2016-04-25 | ||
| PCT/JP2017/016091 WO2017188159A1 (en) | 2016-04-25 | 2017-04-21 | Molten iron desulfurization method and desulfurization apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN109072320A CN109072320A (en) | 2018-12-21 |
| CN109072320B true CN109072320B (en) | 2021-01-05 |
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| CN201780025893.7A Active CN109072320B (en) | 2016-04-25 | 2017-04-21 | Method and apparatus for desulfurizing molten iron |
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| JP (1) | JP6521177B2 (en) |
| KR (1) | KR102300458B1 (en) |
| CN (1) | CN109072320B (en) |
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| CN108588330A (en) * | 2018-06-07 | 2018-09-28 | 王琼 | A kind of molten steel automatic carburetting system and method in tapping process |
| KR102334956B1 (en) | 2018-11-01 | 2021-12-02 | 주식회사 엘지화학 | Ramp for vehicle and manufacturing method of same |
| EP3670677A1 (en) * | 2018-12-17 | 2020-06-24 | S.A. Lhoist Recherche Et Developpement | Process for manufacturing a slag conditioning agent for steel desulfurization |
| CN110747315A (en) * | 2019-11-18 | 2020-02-04 | 张家港宏昌钢板有限公司 | High-efficient molten iron desulphurization unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5123420A (en) * | 1974-06-07 | 1976-02-25 | Nippon Steel Corp | Shutsukochuyokoheno tenkazaitonyusochi |
| JPS54103719A (en) * | 1978-02-01 | 1979-08-15 | Nisshin Steel Co Ltd | Production of low phosphorous and sulfur steel by using conuerter |
| DE3814907A1 (en) * | 1988-05-03 | 1989-11-09 | Thyssen Stahl Ag | METHOD AND DEVICE FOR ADDING ALLOY AGENTS INTO A METAL CASTING JET |
| JP2988305B2 (en) | 1995-02-23 | 1999-12-13 | 住友金属工業株式会社 | Desulfurization method of molten steel |
| JPH09316525A (en) * | 1996-05-31 | 1997-12-09 | Nippon Steel Corp | Method for desulfurizing molten metal at the time of tapping molten metal in electric furnace and device therefor |
| JP3289614B2 (en) * | 1996-09-26 | 2002-06-10 | 日本鋼管株式会社 | Desulfurization method of molten steel |
| JPH11199019A (en) * | 1998-01-07 | 1999-07-27 | Kawasaki Steel Corp | Turning chute for putting in auxiliary material |
| KR20030054521A (en) * | 2001-12-26 | 2003-07-02 | 주식회사 포스코 | An Air Blowing Equipment into the Molten Metal of Converter |
| JP2005187901A (en) * | 2003-12-26 | 2005-07-14 | Jfe Steel Kk | Refining method for molten steel |
| CN100572565C (en) * | 2007-03-14 | 2009-12-23 | 张登山 | Hot metal pretreatment method and pretreatment unit thereof |
| CN102978326A (en) * | 2012-12-18 | 2013-03-20 | 营口东邦冶金设备耐材有限公司 | Free style molten iron desulfurization spray gun |
| CN103924025B (en) * | 2014-03-27 | 2015-09-30 | 东北大学 | A kind of method of top and bottom complex blowing molten iron pre-desulfurization in hot metal ladle |
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- 2017-04-21 WO PCT/JP2017/016091 patent/WO2017188159A1/en active Application Filing
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| KR102300458B1 (en) | 2021-09-09 |
| TW201800583A (en) | 2018-01-01 |
| KR20180132918A (en) | 2018-12-12 |
| WO2017188159A1 (en) | 2017-11-02 |
| JP6521177B2 (en) | 2019-05-29 |
| CN109072320A (en) | 2018-12-21 |
| TWI652350B (en) | 2019-03-01 |
| JPWO2017188159A1 (en) | 2018-09-27 |
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